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pkuhns(at)gmail.com
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 Posted: Thu Oct 06, 2011 6:35 am Post subject: Short-stack Powerflow exhaust - aerodynamic cover for it? |
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Hi Gary: My plane has the short stack Powerflow exhaust. I think it's kinda draggy up there and was wondering if you ever made some covering for it that reduced it's airflow 'signature' (parasitic drag). The oil vent tube also is kinda draggy down there.
Just wondering where you found speed improvements on the Cheetah by reducing parasitic drag. Thank you!
-- Pete Kuhns
N27161, '79 Cheetah
GEZ, Shelbyville, IN
[quote][b]
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teamgrumman(at)yahoo.com
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| Posted: Thu Oct 06, 2011 9:47 am Post subject: Short-stack Powerflow exhaust - aerodynamic cover for it? |
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Hi Pete,
I've made 3 different fairings that fit behind the short stack. The short one worked the best. Plus, it fits up snug behind the pipe so it closes the hole created when you cut out the exit ramp. I can have Dave make you one for $100 with shipping. You'll need to do some trial and error on the mounting to get the least drag.
My 77 Cheetah would true out at about 140 knots. That's running over redline. McCauley prop. Stock exhaust. It was light too. One radio. One GPS. No VOR. But, even with ported and polished cylinders and the HC mod, a loaded Tiger would out climb it.
Lots of drag. I buried the comm antennas, got rid of the VOR antennas and steps.
I restored a 77 Cheetah a few years back. He did everything to that plane. With a New LyCon engine and Sensenich prop, he could true at 142 knots at 2800 RPM with the steps and VOR antennas.
Gary
From: Pete Kuhns <pkuhns(at)gmail.com>
To: teamgrumman-list(at)matronics.com
Sent: Thursday, October 6, 2011 7:32 AM
Subject: TeamGrumman-List: Short-stack Powerflow exhaust - aerodynamic cover for it?
Hi Gary: My plane has the short stack Powerflow exhaust. I think it's kinda draggy up there and was wondering if you ever made some covering for it that reduced it's airflow 'signature' (parasitic drag). The oil vent tube also is kinda draggy down there.
Just wondering where you found speed improvements on the Cheetah by reducing parasitic drag. Thank you!
-- Pete Kuhns
N27161, '79 Cheetah
GEZ, Shelbyville, IN
| | - 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:
http://www.matronics.com/Navigator?TeamGrumman-List |
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pkuhns
Joined: 30 Oct 2011
Posts: 5
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| Posted: Mon Nov 21, 2011 7:23 am Post subject: Re: Short-stack Powerflow exhaust - aerodynamic cover for it |
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Hi Gary: I'm not sure if you'll see this post but I'll give it a shot:
On October 7th I sent $100 payment for the Powerflow Short Stack fairing. I just want to see/ask if there's been any progress manufacturing it. You mentioned having someone else actually build the piece.
Any update would be greatly appreciated.
-- Pete Kuhns
133 West Market Street, Indianapolis, IN 46204
N27161, '79 Cheetah
Powerflow Short Stack Exhaust
GEZ, Shelbyville Indiana
| | - 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:
http://www.matronics.com/Navigator?TeamGrumman-List |
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_________________
N27161, 1979 Grumman (Gulfstream) Cheetah |
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teamgrumman(at)yahoo.com
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| Posted: Mon Nov 21, 2011 7:18 pm Post subject: Short-stack Powerflow exhaust - aerodynamic cover for it? |
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Hi Pete,
Dave had the first one stick in the tool. It really messed up the tool. He's got it repaired and is planning on making me a couple.
I appreciate you writing. I haven't forgotten.
Gary
From: pkuhns <pkuhns(at)gmail.com>
To: teamgrumman-list(at)matronics.com
Sent: Monday, November 21, 2011 7:23 AM
Subject: Re: Short-stack Powerflow exhaust - aerodynamic cover for it?
--> TeamGrumman-List message posted by: "pkuhns" <pkuhns(at)gmail.com (pkuhns(at)gmail.com)>
Hi Gary: I'm not sure if you'll see this post but I'll give it a shot:
On October 7th I sent $100 payment for the Powerflow Short Stack fairing. I just want to see/ask if there's been any progress manufacturing it. You mentioned having someone else actually build the piece.
Any update would be greatly appreciated.
-- Pete Kuhns
133 West Market Street, Indianapolis, IN 46204
N27161, '79 Cheetah
Powerflow Short Stack Exhaust
GEZ, Shelbyville Indiana
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N27161, 1979 Grumman (Gulfstream) Cheetah
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=358625#358bsp; * AeroElectric [url=http://www.aeroeleBookstore http://www.matronics.com/contribution[/url]
_-===================================
[quote][b]
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