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Discover
Joined: 26 Feb 2007
Posts: 429
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 Posted: Tue May 22, 2012 5:57 pm Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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Dan.Schmitz(at)calix.com
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| Posted: Wed May 23, 2012 8:01 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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And I threw in my own order.
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of 923te
Sent: Tuesday, May 22, 2012 10:02 PM
To: teamgrumman-list(at)matronics.com
Subject: Inlet Plugs for Jaguar Cowl on a Tiger
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stockercarolm(at)gmail.co
Guest
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| Posted: Wed May 23, 2012 9:33 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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I have the LoPresti cowl...how about me??? N28742......I'd like a set...
Carol
On Wed, May 23, 2012 at 11:57 AM, Dan Schmitz <Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)> wrote:
[quote]
And I threw in my own order.
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of 923te
Sent: Tuesday, May 22, 2012 10:02 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Inlet Plugs for Jaguar Cowl on a Tiger
---
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teamgrumman(at)yahoo.com
Guest
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| Posted: Wed May 23, 2012 9:51 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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Any updates on your cowl . . . speed? CHTs?
From: Dan Schmitz <Dan.Schmitz(at)calix.com>
To: "teamgrumman-list(at)matronics.com" <teamgrumman-list(at)matronics.com>
Sent: Wednesday, May 23, 2012 8:57 AM
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tiger
And I threw in my own order.
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of 923te
Sent: Tuesday, May 22, 2012 10:02 PM
To: teamgrumman-list(at)matronics.com
Subject: Inlet Plugs for Jaguar Cowl on a Tiger
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teamgrumman(at)yahoo.com
Guest
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| Posted: Wed May 23, 2012 10:01 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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They won't fit. The Jaguar cowling has an elliptical opening. LoPresti is round.
From: Carol Stocker <stockercarolm(at)gmail.com>
To: teamgrumman-list(at)matronics.com
Sent: Wednesday, May 23, 2012 10:32 AM
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
I have the LoPresti cowl...how about me??? N28742......I'd like a set...
Carol
On Wed, May 23, 2012 at 11:57 AM, Dan Schmitz <Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)> wrote:
[quote] And I threw in my own order.
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of 923te
Sent: Tuesday, May 22, 2012 10:02 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Inlet Plugs for Jaguar Cowl on a Tiger
---
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stockercarolm(at)gmail.co
Guest
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| Posted: Wed May 23, 2012 10:05 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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Rats.........
On Wed, May 23, 2012 at 2:00 PM, Gary Vogt <teamgrumman(at)yahoo.com (teamgrumman(at)yahoo.com)> wrote:
[quote] They won't fit. The Jaguar cowling has an elliptical opening. LoPresti is round.
From: Carol Stocker <stockercarolm(at)gmail.com (stockercarolm(at)gmail.com)>
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Sent: Wednesday, May 23, 2012 10:32 AM
Subject: Re: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tiger
I have the LoPresti cowl...how about me??? N28742......I'd like a set...
Carol
On Wed, May 23, 2012 at 11:57 AM, Dan Schmitz <Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)> wrote:
[quote] And I threw in my own order.
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of 923te
Sent: Tuesday, May 22, 2012 10:02 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Inlet Plugs for Jaguar Cowl on a Tiger
---
| | - The Matronics TeamGrumman-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Discover
Joined: 26 Feb 2007
Posts: 429
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| Posted: Wed May 23, 2012 10:29 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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Jim Council has them for the LoPresti
On May 23, 2012, at 1:04 PM, Carol Stocker <stockercarolm(at)gmail.com (stockercarolm(at)gmail.com)> wrote:
[quote]Rats.........
On Wed, May 23, 2012 at 2:00 PM, Gary Vogt <[url=mailto:teamgrumman(at)yahoo.com]teamgrumman(at)yahoo.com (teamgrumman(at)yahoo.com)[/url]> wrote:
[quote] They won't fit. The Jaguar cowling has an elliptical opening. LoPresti is round.
From: Carol Stocker <[url=mailto:stockercarolm(at)gmail.com]stockercarolm(at)gmail.com (stockercarolm(at)gmail.com)[/url]>
To: [url=mailto:teamgrumman-list(at)matronics.com]teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)[/url]
Sent: Wednesday, May 23, 2012 10:32 AM
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
I have the LoPresti cowl...how about me??? N28742......I'd like a set...
Carol
On Wed, May 23, 2012 at 11:57 AM, Dan Schmitz <[url=mailto:Dan.Schmitz(at)calix.com]Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)[/url]> wrote:
[quote] And I threw in my own order.
Dan Schmitz
Tiger 4518B
KASH
From: [url=mailto:owner-teamgrumman-list-server(at)matronics.com]owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)[/url] [mailto:[url=mailto:owner-teamgrumman-list-server(at)matronics.com]owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)[/url]] On Behalf Of 923te
Sent: Tuesday, May 22, 2012 10:02 PM
To: [url=mailto:teamgrumman-list(at)matronics.com]teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)[/url]
Subject: Inlet Plugs for Jaguar Cowl on a Tiger
---
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stockercarolm(at)gmail.co
Guest
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| Posted: Wed May 23, 2012 10:45 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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Thanks....what web site is that???
On Wed, May 23, 2012 at 2:29 PM, 923te <923te(at)att.net (923te(at)att.net)> wrote:
[quote] Jim Council has them for the LoPresti
On May 23, 2012, at 1:04 PM, Carol Stocker <stockercarolm(at)gmail.com (stockercarolm(at)gmail.com)> wrote:
[quote]Rats.........
On Wed, May 23, 2012 at 2:00 PM, Gary Vogt < (teamgrumman(at)yahoo.com)teamgrumman(at)yahoo.com (teamgrumman(at)yahoo.com)> wrote:
[quote] They won't fit. The Jaguar cowling has an elliptical opening. LoPresti is round.
From: Carol Stocker < (stockercarolm(at)gmail.com)stockercarolm(at)gmail.com (stockercarolm(at)gmail.com)>
To: (teamgrumman-list(at)matronics.com)teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Sent: Wednesday, May 23, 2012 10:32 AM
Subject: Re: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tiger
I have the LoPresti cowl...how about me??? N28742......I'd like a set...
Carol
On Wed, May 23, 2012 at 11:57 AM, Dan Schmitz < (Dan.Schmitz(at)calix.com)Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)> wrote:
[quote] And I threw in my own order.
Dan Schmitz
Tiger 4518B
KASH
From: (owner-teamgrumman-list-server(at)matronics.com)owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto: (owner-teamgrumman-list-server(at)matronics.com)owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of 923te
Sent: Tuesday, May 22, 2012 10:02 PM
To: (teamgrumman-list(at)matronics.com)teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Inlet Plugs for Jaguar Cowl on a Tiger
---
| | - The Matronics TeamGrumman-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Dan.Schmitz(at)calix.com
Guest
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| Posted: Wed May 23, 2012 10:59 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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Just this morning, I computed the density altitudes for a test run last Saturday. It was a perfect calm day for speed testing with light winds coming off the ocean (no mountain waves). But then I forgot most of my past results are on a my airplane’s pocket PC back home. I don’t think my new numbers are much different maybe one or two knots better. I dropped in on Brooks with the hopes of talking to him about making some of the adjustments you noted but he was off with his kids.
Do you think if I plug the hole in the one baffle and close the gap in the top center with some rubber, will that make any difference?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of Gary Vogt
Sent: Wednesday, May 23, 2012 1:50 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
Any updates on your cowl . . . speed? CHTs?
[quote][b]
| | - The Matronics TeamGrumman-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Dan.Schmitz(at)calix.com
Guest
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| Posted: Wed May 23, 2012 11:21 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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Oh, and you asked about CHTs. Yeah, they’re generally in the low 300s. The only one I paid attention two last Saturday was #3. I was at 8,500’ full power, leaned as much as possible, then pulled into a 10 degree climb, probably 80 knots, touched no other controls (still leaned). Around 10,000 feet, #3 hit 410 degrees, so I eased off to a 5 degree climb and the temp dropped below 400 when I reached my next test altitude and leveled off. For those that may not have caught this before, I’m theoretically breaking in #3 after some rework. In high power level flight, I don’t think it’s gone above 370. I’m beginning to wonder if it never needed break in, break in is still ongoing, or it’s broken in and temps are what they are. The temps haven’t changed dramatically since the annual. Back then I think they were in the 380s and now I think 370s. Of course back then it was winter and now it’s spring. Is that all the temperature drop I’ll see?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Dan Schmitz
Sent: Wednesday, May 23, 2012 2:56 PM
To: teamgrumman-list(at)matronics.com
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tiger
Just this morning, I computed the density altitudes for a test run last Saturday. It was a perfect calm day for speed testing with light winds coming off the ocean (no mountain waves). But then I forgot most of my past results are on a my airplane’s pocket PC back home. I don’t think my new numbers are much different maybe one or two knots better. I dropped in on Brooks with the hopes of talking to him about making some of the adjustments you noted but he was off with his kids.
Do you think if I plug the hole in the one baffle and close the gap in the top center with some rubber, will that make any difference?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of Gary Vogt
Sent: Wednesday, May 23, 2012 1:50 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
Any updates on your cowl . . . speed? CHTs?
[quote] [b]
| | - The Matronics TeamGrumman-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Dan.Schmitz(at)calix.com
Guest
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| Posted: Wed May 23, 2012 4:35 pm Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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Ok, went through and compared numbers. My plane isn’t any faster than last year. Maybe a knot slower actually. That’s comparing IAS before and after adjusted for density altitude as well as GPS derived airspeed (by flying three directions) come out about the same as well. Below 9000’ I kept the prop at 2700 RPM (using external monitor not tach) so engine power isn’t a variable. At higher altitudes I used whatever full throttle got me and in both cases RPMs were generally the same at comparable density altitudes.
Dan
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Dan Schmitz
Sent: Wednesday, May 23, 2012 2:56 PM
To: teamgrumman-list(at)matronics.com
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tiger
Just this morning, I computed the density altitudes for a test run last Saturday. It was a perfect calm day for speed testing with light winds coming off the ocean (no mountain waves). But then I forgot most of my past results are on a my airplane’s pocket PC back home. I don’t think my new numbers are much different maybe one or two knots better. I dropped in on Brooks with the hopes of talking to him about making some of the adjustments you noted but he was off with his kids.
Do you think if I plug the hole in the one baffle and close the gap in the top center with some rubber, will that make any difference?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of Gary Vogt
Sent: Wednesday, May 23, 2012 1:50 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
Any updates on your cowl . . . speed? CHTs?
==============[/b][/quote] eamGrumman-List Email Forum -[/b][/quote] >[/b][/quote] :p>[/b][/quote] /o:p>[/b][/quote] tor?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List[/b][/quote] ==============[/b][/quote] bsp; - MATRONICS WEB FORUMS -[/b][/quote] :p>[/b][/quote] tp://forums.matronics.com[/b][/quote] ==============[/b][/quote] bsp; - List Contribution Web Site -[/b][/quote] e> bsp; -Matt Dralle, List Admin.[/b][/quote] bution">http://www.matronics.com/contribution[/b][/quote] ==============[/b] [b]
| | - The Matronics TeamGrumman-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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bhauskne(at)gmail.com
Guest
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| Posted: Wed May 23, 2012 4:41 pm Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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So Gary's cowling decreases speed?Brian Hausknechtbhauskne(at)gmail.comwww.brianflys.netwww.brianflys.comSent from my Blackberry
From: Dan Schmitz <Dan.Schmitz(at)calix.com>
Sender: owner-teamgrumman-list-server(at)matronics.com
Date: Thu, 24 May 2012 00:30:58 +0000
To: teamgrumman-list(at)matronics.com<teamgrumman-list(at)matronics.com>
ReplyTo: teamgrumman-list(at)matronics.com
Subject: RE: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tiger
Ok, went through and comp= ared numbers. My plane isn’t any faster than last year. M= aybe a knot slower actually. That’s comparing IAS before and af= ter adjusted for density altitude as well as GPS derived airspeed (by flying three dire= ctions) come out about the same as well. Below 9000’ I kept the= prop at 2700 RPM (using external monitor not tach) so engine power isnR= 17;t a variable. At higher altitudes I used whatever full throttle got me and in both cases RPMs were generally the same at com= parable density altitudes.
<= /p>
<= /p>
Dan
<= /p>
<= /p>
From: owner-te= amgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)m= atronics.com] On Behalf Of Dan Schmitz
Sent: Wednesday, May 23, 2012 2:56 PM
To: teamgrumman-list(at)matronics.com
Subject: RE: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tige= r
Just this morning, I comp= uted the density altitudes for a test run last Saturday. It was a per= fect calm day for speed testing with light winds coming off the ocean (no mountain waves). But then I forgot most of my past results= are on a my airplane’s pocket PC back home. I don’t thin= k my new numbers are much different maybe one or two knots better. I = dropped in on Brooks with the hopes of talking to him about making some of the adjustments you noted but he was off with his kids.
<= /p>
Do you think if I plug th= e hole in the one baffle and close the gap in the top center with some rubb= er, will that make any difference?
<= /p>
Dan Schmitz
Tiger 4518B
KASH
<= /p>
<= /p>
From: owner-teamgr= umman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com= ([email]owner-teamgrumman-li= st-server(at)matronics.com[/email])] On Behalf Of Gary Vogt
Sent: Wednesday, May 23, 2012 1:50 PM
To: teamgrumman-li= st(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Re: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tige= r
Any updates on your= cowl . . . speed? CHTs?
</= span>
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D[/b][/quote] eamGrumman-List Email Forum -[/b][/quote] >[/b][/quote] :p>[/b][/quote] /o:p>[/b][/quote] tor?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List</= a>[/b][/quote] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D[/b][/quote] bsp; - MATRONICS WEB FORUMS -[/b][/quote] :p>[/b][/quote] tp://forums.matronics.com[/b][/quote] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D[/b][/quote] bsp; - List Contribution Web Site -[/b][/quote] e> bsp; &nbs= p;-Matt Dralle, List Admin.<= /b>[/quote] bution">http://www.matronics.com/contribution[/b][/quote] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D[/b][b]
| | - The Matronics TeamGrumman-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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dmwhite(at)e3ra.com
Guest
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| Posted: Wed May 23, 2012 6:12 pm Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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NOT!
Dean White (Tiger N81166)
Edmonds, WA 98026
dmwhite(at)e3ra.com
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Brian Hausknecht
Sent: Wednesday, May 23, 2012 5:41 PM
To: teamgrumman-list(at)matronics.com
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
So Gary's cowling decreases speed?
Brian Hausknecht
bhauskne(at)gmail.com (bhauskne(at)gmail.com)
www.brianflys.net
www.brianflys.com
Sent from my Blackberry
From: Dan Schmitz <Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)>
Sender: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)
Date: Thu, 24 May 2012 00:30:58 +0000
To: teamgrumman-list(at)matronics.com<teamgrumman-list(at)matronics.com ([email]teamgrumman-list(at)matronics.com%3cteamgrumman-list(at)matronics.com[/email])>
ReplyTo: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tiger
Ok, went through and comp= ared numbers. My plane isnt any faster than last year. M= aybe a knot slower actually. Thats comparing IAS before and af= ter adjusted for density altitude as well as GPS derived airspeed (by flying three dire= ctions) come out about the same as well. Below 9000 I kept the= prop at 2700 RPM (using external monitor not tach) so engine power isnR= 17;t a variable. At higher altitudes I used whatever full throttle got me and in both cases RPMs were generally the same at com= parable density altitudes.
<= /p>
<= /p>
Dan
<= /p>
<= /p>
From: owner-te= amgrumman-list-server(at)matronics.com (amgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)m= atronics.com ([email]owner-teamgrumman-list-server(at)m=%20atronics.com[/email])] On Behalf Of Dan Schmitz
Sent: Wednesday, May 23, 2012 2:56 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tige= r
Just this morning, I comp= uted the density altitudes for a test run last Saturday. It was a per= fect calm day for speed testing with light winds coming off the ocean (no mountain waves). But then I forgot most of my past results= are on a my airplanes pocket PC back home. I dont thin= k my new numbers are much different maybe one or two knots better. I = dropped in on Brooks with the hopes of talking to him about making some of the adjustments you noted but he was off with his kids.
<= /p>
Do you think if I plug th= e hole in the one baffle and close the gap in the top center with some rubb= er, will that make any difference?
<= /p>
Dan Schmitz
Tiger 4518B
KASH
<= /p>
<= /p>
From: [url=3D%22mailto:owner-teamgrumman-list-server(at)matronics.com]owner-teamgr= umman-list-server(at)matronics.com[/url] [[url=3D%22mailto:owner-teamgrumman-li=]mailto:owner-teamgrumman-list-server(at)matronics.com= [/url]] On Behalf Of Gary Vogt
Sent: Wednesday, May 23, 2012 1:50 PM
To: [url=3D%22mailto:teamgrumman-list(at)matronics.com]teamgrumman-li= st(at)matronics.com[/url]
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tige= r
Any updates on your= cowl . . . speed? CHTs?
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
eamGrumman-List Email Forum -
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tor?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
bsp; - List Contribution Web Site -
e> bsp; &nbs= p; -Matt Dralle, List Admin.<= /b>
bution">http://www.matronics.com/contribution
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D01234567890123456
~,g
[quote][b]
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| Posted: Wed May 23, 2012 8:34 pm Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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Dan, I think if your plane isn't any faster then something is definitely wrong.
From: Brian Hausknecht <bhauskne(at)gmail.com>
To: teamgrumman-list(at)matronics.com
Sent: Wednesday, May 23, 2012 5:41 PM
Subject: Re: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tiger
So Gary's cowling decreases speed?Brian Hausknecht
bhauskne(at)gmail.com
www.brianflys.net
From: Dan Schmitz <Dan.Schmitz(at)calix.com>
Sender: owner-teamgrumman-list-server(at)matronics.com
Date: Thu, 24 May 2012 00:30:58 +0000
To: teamgrumman-list(at)matronics.com<teamgrumman-list(at)matronics.com>
ReplyTo: teamgrumman-list(at)matronics.com
Subject: RE: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tiger
Ok, went through and comp= ared numbers. My plane isn’t any faster than last year. M= aybe a knot slower actually. That’s comparing IAS before and af= ter adjusted for density altitude as well as GPS derived airspeed (by flying three dire= ctions) come out about the same as well. Below 9000’ I kept the= prop at 2700 RPM (using external monitor not tach) so engine power isnR= 17;t a variable. At higher altitudes I used whatever full throttle got me and in both cases RPMs were generally the same at com= parable density altitudes.
< = /p>
< = /p>
Dan
< = /p>
< = /p>
From: owner-te= amgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)m= atronics.com] On Behalf Of Dan Schmitz
Sent: Wednesday, May 23, 2012 2:56 PM
To: teamgrumman-list(at)matronics.com
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tige= r
Just this morning, I comp= uted the density altitudes for a test run last Saturday. It was a per= fect calm day for speed testing with light winds coming off the ocean (no mountain waves). But then I forgot most of my past results= are on a my airplane’s pocket PC back home. I don’t thin= k my new numbers are much different maybe one or two knots better. I = dropped in on Brooks with the hopes of talking to him about making some of the adjustments you noted but he was off with his kids.
< = /p>
Do you think if I plug th= e hole in the one baffle and close the gap in the top center with some rubb= er, will that make any difference?
< = /p>
Dan Schmitz
Tiger 4518B
KASH
< = /p>
< = /p>
From: owner-teamgr= umman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com= ] On Behalf Of Gary Vogt
Sent: Wednesday, May 23, 2012 1:50 PM
To: teamgrumman-li= st(at)matronics.com
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tige= r
Any updates on your= cowl . . . speed? CHTs?
</ = span>
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D eamGrumman-List Email Forum - > :p> /o:p> tor?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List</= a> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D bsp; - MATRONICS WEB FORUMS - :p> tp://forums.matronics.com =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D bsp; - List Contribution Web Site - e> bsp; &nbs= p; -Matt Dralle, List Admin.< = /b> bution">http://www.matronics.com/contribution =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
http://www.matronics.com/Navigator?TeamGrumman-List[/b][/quote]
¦·›~‰í²,Þg(–ŠÓM4ÓGÚqü¢êâz¹ÞÁÊ.®'«8^M榻¦™©ËŠËD™¨¥Šî�,zØ^1«k¢xœ°¸¬´Wš¶êÞ°Ö¯Š¢»hnº0±í…隟"â²ÛŠX‰ë,¹ÈZ°¸¬µIÿJæìr¸©¶*'
[quote][b]
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| Posted: Wed May 23, 2012 8:37 pm Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
|
|
Dan, I really can't tell from here what is with your plane. I've installed 7 Jaguar Cowlings and not one was slower. Do you know how to compute True Airspeed? Indicated airspeed is meaningless.
From: Dan Schmitz <Dan.Schmitz(at)calix.com>
To: "teamgrumman-list(at)matronics.com" <teamgrumman-list(at)matronics.com>
Sent: Wednesday, May 23, 2012 11:55 AM
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tiger
Just this morning, I computed the density altitudes for a test run last Saturday. It was a perfect calm day for speed testing with light winds coming off the ocean (no mountain waves). But then I forgot most of my past results are on a my airplane’s pocket PC back home. I don’t think my new numbers are much different maybe one or two knots better. I dropped in on Brooks with the hopes of talking to him about making some of the adjustments you noted but he was off with his kids.
Do you think if I plug the hole in the one baffle and close the gap in the top center with some rubber, will that make any difference?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of Gary Vogt
Sent: Wednesday, May 23, 2012 1:50 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
Any updates on your cowl . . . speed? CHTs?
[quote][b]
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teamgrumman(at)yahoo.com
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| Posted: Wed May 23, 2012 8:44 pm Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
|
|
Dean, what is your experience with the cowling?
From: Dean White <dmwhite(at)e3ra.com>
To: teamgrumman-list(at)matronics.com
Sent: Wednesday, May 23, 2012 7:12 PM
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tiger
NOT!
Dean White (Tiger N81166)
Edmonds, WA 98026
dmwhite(at)e3ra.com
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Brian Hausknecht
Sent: Wednesday, May 23, 2012 5:41 PM
To: teamgrumman-list(at)matronics.com
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
So Gary's cowling decreases speed?
Brian Hausknecht
bhauskne(at)gmail.com (bhauskne(at)gmail.com)
www.brianflys.net
www.brianflys.com
From: Dan Schmitz <Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)>
Sender: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)
Date: Thu, 24 May 2012 00:30:58 +0000
To: teamgrumman-list(at)matronics.com<teamgrumman-list(at)matronics.com ([email]teamgrumman-list(at)matronics.com%3cteamgrumman-list(at)matronics.com[/email])>
ReplyTo: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tiger
Ok, went through and comp= ared numbers. My plane isn’t any faster than last year. M= aybe a knot slower actually. That’s comparing IAS before and af= ter adjusted for density altitude as well as GPS derived airspeed (by flying three dire= ctions) come out about the same as well. Below 9000’ I kept the= prop at 2700 RPM (using external monitor not tach) so engine power isnR= 17;t a variable. At higher altitudes I used whatever full throttle got me and in both cases RPMs were generally the same at com= parable density altitudes.
<= /p>
<= /p>
Dan
<= /p>
<= /p>
From: owner-te= amgrumman-list-server(at)matronics.com (amgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)m= atronics.com ([email]owner-teamgrumman-list-server(at)m=%20atronics.com[/email])] On Behalf Of Dan Schmitz
Sent: Wednesday, May 23, 2012 2:56 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tige= r
Just this morning, I comp= uted the density altitudes for a test run last Saturday. It was a per= fect calm day for speed testing with light winds coming off the ocean (no mountain waves). But then I forgot most of my past results= are on a my airplane’s pocket PC back home. I don’t thin= k my new numbers are much different maybe one or two knots better. I = dropped in on Brooks with the hopes of talking to him about making some of the adjustments you noted but he was off with his kids.
<= /p>
Do you think if I plug th= e hole in the one baffle and close the gap in the top center with some rubb= er, will that make any difference?
<= /p>
Dan Schmitz
Tiger 4518B
KASH
<= /p>
<= /p>
From: owner-teamgr= umman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com= ] On Behalf Of Gary Vogt
Sent: Wednesday, May 23, 2012 1:50 PM
To: teamgrumman-li= st(at)matronics.com
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tige= r
Any updates on your= cowl . . . speed? CHTs?
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
eamGrumman-List Email Forum -
/o:p>
tor?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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bsp; - List Contribution Web Site -
e> bsp; &nbs= p; -Matt Dralle, List Admin. <= /b>
bution">http://www.matronics.com/contribution
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
01234567890123456¦·~‰²,
g–ÓÓ
7
[quote][b]
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Dan.Schmitz(at)calix.com
Guest
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| Posted: Thu May 24, 2012 4:08 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
|
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If IAS is meaningless, then computing TAS off of IAS is a pointless exercise. I was comparing IAS of density altitude to IAS of the same density altitude. The TAS calculations will work out to be the same in either case. Note that I completely ignored the IAS in a number of test runs where I simply used GPS ground speed in 3 directions to compute a TAS using some fun formulas. The numbers all come out to “no real change”.
Now, by the argument that a prop turning X RPM at Y density altitude will see no speed change even as there are drag reductions…um counter-intuitive, but my high altitude tests up to 13,300’ with new cowl so far show no changes either. Of course, the problem with my high density altitude tests then are they are at “full” engine power, I lean for highest RPM in a speed test at higher altitudes. I don’t imagine my engine is doing its best with a cylinder being broken in (maybe) and running on mineral oil. So there’s power I’m not getting yet. Do most Grummans see a 5 knot speedup after breaking in and switching to normal oil?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Gary Vogt
Sent: Thursday, May 24, 2012 12:37 AM
To: teamgrumman-list(at)matronics.com
Subject: Re: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tiger
Dan, I really can't tell from here what is with your plane. I've installed 7 Jaguar Cowlings and not one was slower. Do you know how to compute True Airspeed? Indicated airspeed is meaningless.
From: Dan Schmitz <Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)>
To: "teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)" <teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)>
Sent: Wednesday, May 23, 2012 11:55 AM
Subject: RE: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tiger
Just this morning, I computed the density altitudes for a test run last Saturday. It was a perfect calm day for speed testing with light winds coming off the ocean (no mountain waves). But then I forgot most of my past results are on a my airplane’s pocket PC back home. I don’t think my new numbers are much different maybe one or two knots better. I dropped in on Brooks with the hopes of talking to him about making some of the adjustments you noted but he was off with his kids.
Do you think if I plug the hole in the one baffle and close the gap in the top center with some rubber, will that make any difference?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of Gary Vogt
Sent: Wednesday, May 23, 2012 1:50 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Re: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tiger
Any updates on your cowl . . . speed? CHTs?
| Quote: | | _-============================================================_-= - The TeamGrumman-List Email Forum -_-= Use the Matronics List Features Navigator to browse_-= the many List utilities such as List Un/Subscription,_-= Archive Search & Download, 7-Day Browse, Chat, FAQ,_-= Photoshare, and much much more:_-=_-= --> http://www.matronics.com/Navigator?TeamGrumman-List |
0 1 2 3 4 5 6 7 8 9 | Quote: | | _-============================================================ |
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3
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Discover
Joined: 26 Feb 2007
Posts: 429
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| Posted: Thu May 24, 2012 6:01 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
|
|
Dan,
I would think that flight testing and comparing at lower altitudes, near sea level if possible, would maximize any effects due to drag reduction. Also, it is very difficult to get repeatable results. If you are not setting the engine the same you probably won't get repeatable results. Breaking in a cylinder definitely has a negative effect. But if your oil consumption has dropped since the new install it's probably already broke in. Lycoming says keep doing break in procedure for 50 hrs.
I always set for best power by the Lycoming book method and then check it by adjusting the mixture with the prop set in manual mode to ensure maximum rpm. I fly at equivalent density altitude calculated on the fly by the Garmin 430 and also do the compass ordinates and formulas for wind correction. I try and fly at the same OAT. Seems to make a difference even though I am flying at equivalent DAs. I always have the same amount of fuel on board, have a freshly cleaned and waxed plane and prop and ensure the same CG. The flaps have to be in exactly the same position, whatever that was last time. A difference of even 1 deg up or down will effect your speed. This is hard to get consistent. If a trim tab was touched between tests it will also affect your results. I always repeat the test 3 or 4 times until the numbers repeat. If they don't repeat then something is changing and I quit and try another day. It's really tedious to get good numbers but it's another excuse to go fly;) Food for thought, the air speed needle is about 2 kts wide, so it's really hard to detect a 1-2 knot speed increase. Thats one reason why I record indicated airspeed, true air speed and ground speed from the gps on every flight test. The last 2 are digital from the Garmin. Another uncanny result I continue to experience is that flying directly with the wind almost always gets me 2 more knots than flying directly into the wind. I think David Fletcher told me this was his experience also. That's not supposed to be that way. Weird huh?
Something to think about is that if you are getting about the same speed as before Jaguar but have lower CHTs then you are in effect going faster. That energy is just being lost by the increased cooling drag. Maybe an area worth experimenting with;)
My after Jag experience is that the speed is about the same but the cooling is better by about 45 deg F. My plane was already fast so the typical speed increase from the Jag wouldn't be as likely for it. If I can get my CHTs back to 380s from the now 330s by cooling drag reduction, I think I might see that 5-7 kts increase I had hoped for.
BTW, what brand gauges are you using for the temperatures?
Regards,
Ned
On May 24, 2012, at 7:04 AM, Dan Schmitz <Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)> wrote:
| Quote: | v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} <![endif]--> <![endif]--> <![endif]-->
If IAS is meaningless, then computing TAS off of IAS is a pointless exercise. I was comparing IAS of density altitude to IAS of the same density altitude. The TAS calculations will work out to be the same in either case. Note that I completely ignored the IAS in a number of test runs where I simply used GPS ground speed in 3 directions to compute a TAS using some fun formulas. The numbers all come out to “no real change”.
Now, by the argument that a prop turning X RPM at Y density altitude will see no speed change even as there are drag reductions…um counter-intuitive, but my high altitude tests up to 13,300’ with new cowl so far show no changes either. Of course, the problem with my high density altitude tests then are they are at “full” engine power, I lean for highest RPM in a speed test at higher altitudes. I don’t imagine my engine is doing its best with a cylinder being broken in (maybe) and running on mineral oil. So there’s power I’m not getting yet. Do most Grummans see a 5 knot speedup after breaking in and switching to normal oil?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Gary Vogt
Sent: Thursday, May 24, 2012 12:37 AM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
Dan, I really can't tell from here what is with your plane. I've installed 7 Jaguar Cowlings and not one was slower. Do you know how to compute True Airspeed? Indicated airspeed is meaningless.
From: Dan Schmitz <Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)>
To: "teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)" <teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)>
Sent: Wednesday, May 23, 2012 11:55 AM
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tiger
Just this morning, I computed the density altitudes for a test run last Saturday. It was a perfect calm day for speed testing with light winds coming off the ocean (no mountain waves). But then I forgot most of my past results are on a my airplane’s pocket PC back home. I don’t think my new numbers are much different maybe one or two knots better. I dropped in on Brooks with the hopes of talking to him about making some of the adjustments you noted but he was off with his kids.
Do you think if I plug the hole in the one baffle and close the gap in the top center with some rubber, will that make any difference?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of Gary Vogt
Sent: Wednesday, May 23, 2012 1:50 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
Any updates on your cowl . . . speed? CHTs?
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teamgrumman(at)yahoo.com
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| Posted: Thu May 24, 2012 9:29 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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Well, Dan,
On N3752W, the only change to the plane was the cowling. Right out of the hangar it was 5 knots (TAS) faster than the stock cowling at altitudes between 1500 feet and 5500 feet and 2700 rpm. It was also easier to run past 2700 rpm at 8000 feet. So, I don't know what to tell you.
When I installed the very first one on N119ST, it was 9 knots (TAS) faster. On my plane with a 65-63-61 prop, it was 10 knots (TAS) faster. Both at 2700 rpm. My old cowling, however, didn't fit well, was debonding and patched all over.
I wish you were closer.
Gary
From: Dan Schmitz <Dan.Schmitz(at)calix.com>
To: "teamgrumman-list(at)matronics.com" <teamgrumman-list(at)matronics.com>
Sent: Thursday, May 24, 2012 5:04 AM
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tiger
If IAS is meaningless, then computing TAS off of IAS is a pointless exercise. I was comparing IAS of density altitude to IAS of the same density altitude. The TAS calculations will work out to be the same in either case. Note that I completely ignored the IAS in a number of test runs where I simply used GPS ground speed in 3 directions to compute a TAS using some fun formulas. The numbers all come out to “no real change�.
Now, by the argument that a prop turning X RPM at Y density altitude will see no speed change even as there are drag reductions…um counter-intuitive, but my high altitude tests up to 13,300’ with new cowl so far show no changes either. Of course, the problem with my high density altitude tests then are they are at “full� engine power, I lean for highest RPM in a speed test at higher altitudes. I don’t imagine my engine is doing its best with a cylinder being broken in (maybe) and running on mineral oil. So there’s power I’m not getting yet. Do most Grummans see a 5 knot speedup after breaking in and switching to normal oil?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Gary Vogt
Sent: Thursday, May 24, 2012 12:37 AM
To: teamgrumman-list(at)matronics.com
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
Dan, I really can't tell from here what is with your plane. I've installed 7 Jaguar Cowlings and not one was slower. Do you know how to compute True Airspeed? Indicated airspeed is meaningless.
From: Dan Schmitz <Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)>
To: "teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)" <teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)>
Sent: Wednesday, May 23, 2012 11:55 AM
Subject: RE: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tiger
Just this morning, I computed the density altitudes for a test run last Saturday. It was a perfect calm day for speed testing with light winds coming off the ocean (no mountain waves). But then I forgot most of my past results are on a my airplane’s pocket PC back home. I don’t think my new numbers are much different maybe one or two knots better. I dropped in on Brooks with the hopes of talking to him about making some of the adjustments you noted but he was off with his kids.
Do you think if I plug the hole in the one baffle and close the gap in the top center with some rubber, will that make any difference?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of Gary Vogt
Sent: Wednesday, May 23, 2012 1:50 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
Any updates on your cowl . . . speed? CHTs?
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| Posted: Thu May 24, 2012 9:36 am Post subject: Inlet Plugs for Jaguar Cowl on a Tiger |
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Ned, did you get the cowling modified?
From: 923TE <923te(at)att.net>
To: "teamgrumman-list(at)matronics.com" <teamgrumman-list(at)matronics.com>
Sent: Thursday, May 24, 2012 7:00 AM
Subject: Re: Inlet Plugs for Jaguar Cowl on a Tiger
Dan,
I would think that flight testing and comparing at lower altitudes, near sea level if possible, would maximize any effects due to drag reduction. Also, it is very difficult to get repeatable results. If you are not setting the engine the same you probably won't get repeatable results. Breaking in a cylinder definitely has a negative effect. But if your oil consumption has dropped since the new install it's probably already broke in. Lycoming says keep doing break in procedure for 50 hrs.
I always set for best power by the Lycoming book method and then check it by adjusting the mixture with the prop set in manual mode to ensure maximum rpm. I fly at equivalent density altitude calculated on the fly by the Garmin 430 and also do the compass ordinates and formulas for wind correction. I try and fly at the same OAT. Seems to make a difference even though I am flying at equivalent DAs. I always have the same amount of fuel on board, have a freshly cleaned and waxed plane and prop and ensure the same CG. The flaps have to be in exactly the same position, whatever that was last time. A difference of even 1 deg up or down will effect your speed. This is hard to get consistent. If a trim tab was touched between tests it will also affect your results. I always repeat the test 3 or 4 times until the numbers repeat. If they don't repeat then something is changing and I quit and try another day. It's really tedious to get good numbers but it's another excuse to go fly;) Food for thought, the air speed needle is about 2 kts wide, so it's really hard to detect a 1-2 knot speed increase. Thats one reason why I record indicated airspeed, true air speed and ground speed from the gps on every flight test. The last 2 are digital from the Garmin. Another uncanny result I continue to experience is that flying directly with the wind almost always gets me 2 more knots than flying directly into the wind. I think David Fletcher told me this was his experience also. That's not supposed to be that way. Weird huh?
Something to think about is that if you are getting about the same speed as before Jaguar but have lower CHTs then you are in effect going faster. That energy is just being lost by the increased cooling drag. Maybe an area worth experimenting with;)
My after Jag experience is that the speed is about the same but the cooling is better by about 45 deg F. My plane was already fast so the typical speed increase from the Jag wouldn't be as likely for it. If I can get my CHTs back to 380s from the now 330s by cooling drag reduction, I think I might see that 5-7 kts increase I had hoped for.
BTW, what brand gauges are you using for the temperatures?
Regards,
Ned
On May 24, 2012, at 7:04 AM, Dan Schmitz <Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)> wrote:
| Quote: | If IAS is meaningless, then computing TAS off of IAS is a pointless exercise. I was comparing IAS of density altitude to IAS of the same density altitude. The TAS calculations will work out to be the same in either case. Note that I completely ignored the IAS in a number of test runs where I simply used GPS ground speed in 3 directions to compute a TAS using some fun formulas. The numbers all come out to “no real change”.
Now, by the argument that a prop turning X RPM at Y density altitude will see no speed change even as there are drag reductions…um counter-intuitive, but my high altitude tests up to 13,300’ with new cowl so far show no changes either. Of course, the problem with my high density altitude tests then are they are at “full” engine power, I lean for highest RPM in a speed test at higher altitudes. I don’t imagine my engine is doing its best with a cylinder being broken in (maybe) and running on mineral oil. So there’s power I’m not getting yet. Do most Grummans see a 5 knot speedup after breaking in and switching to normal oil?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Gary Vogt
Sent: Thursday, May 24, 2012 12:37 AM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Re: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tiger
Dan, I really can't tell from here what is with your plane. I've installed 7 Jaguar Cowlings and not one was slower. Do you know how to compute True Airspeed? Indicated airspeed is meaningless.
From: Dan Schmitz <Dan.Schmitz(at)calix.com (Dan.Schmitz(at)calix.com)>
To: "teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)" <teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)>
Sent: Wednesday, May 23, 2012 11:55 AM
Subject: RE: Inlet Plugs for Jaguar Cowl on a Tiger
Just this morning, I computed the density altitudes for a test run last Saturday. It was a perfect calm day for speed testing with light winds coming off the ocean (no mountain waves). But then I forgot most of my past results are on a my airplane’s pocket PC back home. I don’t think my new numbers are much different maybe one or two knots better. I dropped in on Brooks with the hopes of talking to him about making some of the adjustments you noted but he was off with his kids.
Do you think if I plug the hole in the one baffle and close the gap in the top center with some rubber, will that make any difference?
Dan Schmitz
Tiger 4518B
KASH
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of Gary Vogt
Sent: Wednesday, May 23, 2012 1:50 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Re: TeamGrumman-List: Inlet Plugs for Jaguar Cowl on a Tiger
Any updates on your cowl . . . speed? CHTs?
=============================== bsp; - The TeamGrumman-List Email Forum - Matronics List Features Navigator to browse y List utilities such as List Un/Subscription, Search & Download, 7-Day Browse, Chat, FAQ, are, and much much more: :p> bsp; --> http://www.matronics.com/Navigator?TeamGrumman-List :p> =============================== bsp; - MATRONICS WEB FORUMS - eat content also available via the Web Forums! :p> bsp; --> http://forums.matronics.com :p> ====== bsp; - List Contribution Web Site - hank you for your generous support! bsp; -Matt Dralle, List Admin. bsp; --> http://www.matronics.com/contribution ===============================
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