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Cowl Flaps

 
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Kellym



Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
PostPosted: Sun Jun 12, 2016 7:30 pm    Post subject: Cowl Flaps Reply with quote
Has anyone installed one or two of the Anti-Slat cowl flap modules?
I have my cruise temps settled into the 350s, but have difficult time
keeping initial climb temps under 420. Oil temp is fine.
Just looking for report of benefit, any install issues.
Kelly

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PostPosted: Sun Jun 12, 2016 8:03 pm    Post subject: Cowl Flaps Reply with quote
Kelly
I have seen but did not install the cowl flaps. they are really nice, but decided that I wasn't going to worry about my climb outs exceeding 400sF when Lycoming told me it was normal to see these temps.I thought it would be more work then worth it.
you'll need to run the wires through firewall to connect at cowling. you'll also need to cut the sides for the flaps to fit without hitting the exhaust, otherwise shouldn't be too hard to install.
Allan told me he guaranteed the Temps would go down with his flapa, and I believe he is right. really can not go wrong g with any of the antisplat products. 
Pascal
Sent from my Samsung Galaxy Tab® S

-------- Original message --------
From: Kelly McMullen <kellym(at)aviating.com>
Date: 06/12/2016 8:34 PM (GMT-08:00)
To: rv10-list(at)matronics.com
Subject: RV10-List: Cowl Flaps
--> RV10-List message posted by: Kelly McMullen <kellym(at)aviating.com>

Has anyone installed one or two of the Anti-Slat cowl flap modules?
I have my cruise temps settled into the 350s, but have difficult time
keeping initial climb temps under 420. Oil temp is fine.
Just looking for report of benefit, any install issues.
Kelly

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Greg McFarlane



Joined: 12 Apr 2012
Posts: 57
Location: Albany Western Australia
PostPosted: Mon Jun 13, 2016 2:23 am    Post subject: Re: Cowl Flaps Reply with quote
Have to agree with Pascall, AntiSplat has got some good gear, however you may consider this Low Tech Low Cost mod, with care can be done on painted bottom cowl, pic shows "letter box" vents in bottom cowl of an RV6. I did the same on my flying RV10. Locate the three sided cut about three inches from the rear edge of the bottom cowl, lift the front to clear the exhaust fill in the sides, job done. This mod has been very successful in reducing OIL and CHT temps on two and four place RVs here in WEST OZ by providing extra exit air flow. Other advantages apart from being a home grown successful mod are, no observed speed penalty, undetectable from the side of the aircraft, makes a handy hand hold when fitting the bottom cowl, permenant no ongoing maintenance or extra wirering and plugs. Cheers from Western Australia

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EdKranz



Joined: 29 Dec 2010
Posts: 132
Location: Hastings, MN
PostPosted: Mon Jun 13, 2016 6:07 am    Post subject: Cowl Flaps Reply with quote
I have a pair of AntiSplat cowl flaps installed in my 10. I'm not sure that I would do it again if I were starting over. They were expensive (at $370 each), and both of the hinges ended up cracking due to the VERY tight radius they bent into the aluminum piano hinge. I ended up replacing the hinge with stainless hinge.

Maybe I'll be a little happier with them in a few months when the PITA of replacing those hinges isn't as fresh in my mind!
As for cooling, I never had the stock louvers installed, so I can't compare one to the other, but I can do full power climbs (at ~120kts) all the way to 12k with CHTs staying below 400.
https://picasaweb.google.com/104915858356518723094/RandomPictures#6295676919752788290

[img]cid:ii_1554a00d05ee4555[/img]


On Sun, Jun 12, 2016 at 11:03 PM, P Reid <rv10flyer(at)live.com (rv10flyer(at)live.com)> wrote:
Quote:
Kelly
I have seen but did not install the cowl flaps. they are really nice, but decided that I wasn't going to worry about my climb outs exceeding 400sF when Lycoming told me it was normal to see these temps.I thought it would be more work then worth it.
you'll need to run the wires through firewall to connect at cowling. you'll also need to cut the sides for the flaps to fit without hitting the exhaust, otherwise shouldn't be too hard to install.
Allan told me he guaranteed the Temps would go down with his flapa, and I believe he is right. really can not go wrong g with any of the antisplat products. 
Pascal
Sent from my Samsung Galaxy Tab® S

-------- Original message --------
From: Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)>
Date: 06/12/2016 8:34 PM (GMT-08:00)
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Cowl Flaps
--> RV10-List message posted by: Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)>

Has anyone installed one or two of the Anti-Slat cowl flap modules?
I have my cruise temps settled into the 350s, but have difficult time
keeping initial climb temps under 420. Oil temp is fine.
Just looking for report of benefit, any install issues.
Kelly

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Deems Davis



Joined: 09 Jan 2006
Posts: 925
PostPosted: Mon Jun 13, 2016 7:29 am    Post subject: Cowl Flaps Reply with quote
Kelly

There's a guy (at) DVT with a 10 that has them installed, I think he's happy with them, but when I last spoke with him he was in the process of replacing the mounting brackets that mount them to the cowl, apparently the initial brackets were subject to some vibration cracks. He showed me where they had cracked/broke in several places. I don't know his name, he's not very chatty. His plane is the one with all of the military, Marine Corp and Patriotic air brushed paint job.
Deems
On Mon, Jun 13, 2016 at 3:23 AM, Greg McFarlane <grbcmcfarlane(at)gmail.com (grbcmcfarlane(at)gmail.com)> wrote:
Quote:
--> RV10-List message posted by: "Greg McFarlane" <grbcmcfarlane(at)gmail.com (grbcmcfarlane(at)gmail.com)>

Have to agree with Pascall, AntiSplat has got some good gear, however you may consider this Low Tech Low Cost mod,  with care can be done on painted bottom cowl, pic shows "letter box" vents in bottom cowl of an RV6. I did the same on my flying RV10. Locate the three sided cut about three inches from the rear edge of the bottom cowl, lift the front to clear the exhaust fill in the sides, job done. This mod has been very successful in reducing OIL and CHT temps on two and four place RVs here in WEST OZ by providing extra exit air flow. Other advantages apart from being a home grown successful mod are, no observed speed penalty, undetectable from the side of the aircraft, makes a handy hand hold when fitting the bottom cowl, permenant no ongoing maintenance or extra wirering and plugs. Cheers from Western Australia




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Kelly McMullen



Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
PostPosted: Mon Jun 13, 2016 1:56 pm    Post subject: Cowl Flaps Reply with quote
Thanks Ed. Very helpful. I guess that shows the stock louvers are not that effective. I was thinking of putting the cowl flaps outside the louvers. I will have to but a 3-D template to verify muffler clearance, but looked okay this morning, just eyeballing it.

-sent from the microchip implanted in my forearm

On Mon, Jun 13, 2016 at 7:06 AM, Ed Kranz <ed.kranz(at)gmail.com (ed.kranz(at)gmail.com)> wrote:
Quote:
I have a pair of AntiSplat cowl flaps installed in my 10. I'm not sure that I would do it again if I were starting over. They were expensive (at $370 each), and both of the hinges ended up cracking due to the VERY tight radius they bent into the aluminum piano hinge. I ended up replacing the hinge with stainless hinge.

Maybe I'll be a little happier with them in a few months when the PITA of replacing those hinges isn't as fresh in my mind!
As for cooling, I never had the stock louvers installed, so I can't compare one to the other, but I can do full power climbs (at ~120kts) all the way to 12k with CHTs staying below 400.
https://picasaweb.google.com/104915858356518723094/RandomPictures#6295676919752788290

[img]cid:ii_1554a00d05ee4555[/img]


On Sun, Jun 12, 2016 at 11:03 PM, P Reid <rv10flyer(at)live.com (rv10flyer(at)live.com)> wrote:
Quote:
Kelly
I have seen but did not install the cowl flaps. they are really nice, but decided that I wasn't going to worry about my climb outs exceeding 400sF when Lycoming told me it was normal to see these temps.I thought it would be more work then worth it.
you'll need to run the wires through firewall to connect at cowling. you'll also need to cut the sides for the flaps to fit without hitting the exhaust, otherwise shouldn't be too hard to install.
Allan told me he guaranteed the Temps would go down with his flapa, and I believe he is right. really can not go wrong g with any of the antisplat products. 
Pascal
Sent from my Samsung Galaxy Tab® S

-------- Original message --------
From: Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)>
Date: 06/12/2016 8:34 PM (GMT-08:00)
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Cowl Flaps
--> RV10-List message posted by: Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)>

Has anyone installed one or two of the Anti-Slat cowl flap modules?
I have my cruise temps settled into the 350s, but have difficult time
keeping initial climb temps under 420. Oil temp is fine.
Just looking for report of benefit, any install issues.
Kelly

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civengpe



Joined: 14 Feb 2011
Posts: 105
PostPosted: Mon Jun 13, 2016 2:07 pm    Post subject: Cowl Flaps Reply with quote
I have the stock louvers installed and have had absolutely no temperature issues on climb out.  Friday I climbed straight to 11.5k at 120kts and none of my cylinders even came close to 400. 

Shannon


On Monday, June 13, 2016, Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)> wrote:
Quote:
Thanks Ed. Very helpful. I guess that shows the stock louvers are not that effective. I was thinking of putting the cowl flaps outside the louvers. I will have to but a 3-D template to verify muffler clearance, but looked okay this morning, just eyeballing it.

-sent from the microchip implanted in my forearm

On Mon, Jun 13, 2016 at 7:06 AM, Ed Kranz <[url=javascript:_e(%7B%7D,'cvml','ed.kranz(at)gmail.com');]ed.kranz(at)gmail.com[/url]> wrote:
Quote:
I have a pair of AntiSplat cowl flaps installed in my 10. I'm not sure that I would do it again if I were starting over. They were expensive (at $370 each), and both of the hinges ended up cracking due to the VERY tight radius they bent into the aluminum piano hinge. I ended up replacing the hinge with stainless hinge.

Maybe I'll be a little happier with them in a few months when the PITA of replacing those hinges isn't as fresh in my mind!
As for cooling, I never had the stock louvers installed, so I can't compare one to the other, but I can do full power climbs (at ~120kts) all the way to 12k with CHTs staying below 400.
https://picasaweb.google.com/104915858356518723094/RandomPictures#6295676919752788290

[img]cid:ii_1554a00d05ee4555[/img]


On Sun, Jun 12, 2016 at 11:03 PM, P Reid <[url=javascript:_e(%7B%7D,'cvml','rv10flyer(at)live.com');]rv10flyer(at)live.com[/url]> wrote:
Quote:
Kelly
I have seen but did not install the cowl flaps. they are really nice, but decided that I wasn't going to worry about my climb outs exceeding 400sF when Lycoming told me it was normal to see these temps.I thought it would be more work then worth it.
you'll need to run the wires through firewall to connect at cowling. you'll also need to cut the sides for the flaps to fit without hitting the exhaust, otherwise shouldn't be too hard to install.
Allan told me he guaranteed the Temps would go down with his flapa, and I believe he is right. really can not go wrong g with any of the antisplat products. 
Pascal
Sent from my Samsung Galaxy Tab® S

-------- Original message --------
From: Kelly McMullen <[url=javascript:_e(%7B%7D,'cvml','kellym(at)aviating.com');]kellym(at)aviating.com[/url]>
Date: 06/12/2016 8:34 PM (GMT-08:00)
To: [url=javascript:_e(%7B%7D,'cvml','rv10-list(at)matronics.com');]rv10-list(at)matronics.com[/url]
Subject: Cowl Flaps
--> RV10-List message posted by: Kelly McMullen <[url=javascript:_e(%7B%7D,'cvml','kellym(at)aviating.com');]kellym(at)aviating.com[/url]>

Has anyone installed one or two of the Anti-Slat cowl flap modules?
I have my cruise temps settled into the 350s, but have difficult time
keeping initial climb temps under 420. Oil temp is fine.
Just looking for report of benefit, any install issues.
Kelly

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Kelly McMullen



Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
PostPosted: Mon Jun 13, 2016 5:03 pm    Post subject: Cowl Flaps Reply with quote
I don't suppose you were starting from ground temps of 85-90, much less departing with an engine that had already been hot soaked during a refuel stop.  I expect this weekend I will be doing at least on takeoff with surface temps above 100.
-sent from the microchip implanted in my forearm

On Mon, Jun 13, 2016 at 3:06 PM, Shannon Hicks <civeng123(at)gmail.com (civeng123(at)gmail.com)> wrote:
Quote:
I have the stock louvers installed and have had absolutely no temperature issues on climb out.  Friday I climbed straight to 11.5k at 120kts and none of my cylinders even came close to 400. 

Shannon


On Monday, June 13, 2016, Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)> wrote:
Quote:
Thanks Ed. Very helpful. I guess that shows the stock louvers are not that effective. I was thinking of putting the cowl flaps outside the louvers. I will have to but a 3-D template to verify muffler clearance, but looked okay this morning, just eyeballing it.

Quote:







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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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Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD
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tomrv4



Joined: 04 Aug 2015
Posts: 8
PostPosted: Mon Jun 13, 2016 6:52 pm    Post subject: Cowl Flaps Reply with quote
Ed,
Have you happened to do a climb to altitude with the cowl flaps open, and another under the same conditions with the cowl flaps closed? Would love to see the results of that.
Thanks!
Tom

On Jun 13, 2016, at 9:06 AM, Ed Kranz <ed.kranz(at)gmail.com (ed.kranz(at)gmail.com)> wrote:
Quote:
I have a pair of AntiSplat cowl flaps installed in my 10. I'm not sure that I would do it again if I were starting over. They were expensive (at $370 each), and both of the hinges ended up cracking due to the VERY tight radius they bent into the aluminum piano hinge. I ended up replacing the hinge with stainless hinge.

Maybe I'll be a little happier with them in a few months when the PITA of replacing those hinges isn't as fresh in my mind!
As for cooling, I never had the stock louvers installed, so I can't compare one to the other, but I can do full power climbs (at ~120kts) all the way to 12k with CHTs staying below 400.
https://picasaweb.google.com/104915858356518723094/RandomPictures#6295676919752788290

<image.png>


On Sun, Jun 12, 2016 at 11:03 PM, P Reid <rv10flyer(at)live.com (rv10flyer(at)live.com)> wrote:
Quote:
Kelly
I have seen but did not install the cowl flaps. they are really nice, but decided that I wasn't going to worry about my climb outs exceeding 400sF when Lycoming told me it was normal to see these temps.I thought it would be more work then worth it.
you'll need to run the wires through firewall to connect at cowling. you'll also need to cut the sides for the flaps to fit without hitting the exhaust, otherwise shouldn't be too hard to install.
Allan told me he guaranteed the Temps would go down with his flapa, and I believe he is right. really can not go wrong g with any of the antisplat products.Â
Pascal
Sent from my Samsung Galaxy Tab® S

-------- Original message --------
From: Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)>
Date: 06/12/2016 8:34 PM (GMT-08:00)
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Cowl Flaps
--> RV10-List message posted by: Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)>

Has anyone installed one or two of the Anti-Slat cowl flap modules?
I have my cruise temps settled into the 350s, but have difficult time
keeping initial climb temps under 420. Oil temp is fine.
Just looking for report of benefit, any install issues.
Kelly

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PostPosted: Tue Jun 14, 2016 4:36 am    Post subject: Cowl Flaps Reply with quote
Just as a data point, I did exactly that (90, heat soaked, climb to 9).  I did have one cylinder hit 400 but the rest stayed under 380 as they always do.  Having problems with cylinder 1 which breaks 380 regularly climbing out during our southern summers.

But this is a stock '10 with a stock IO-540 pulling  2600rpms with a stock 2 bladed prop.  I normally climb at 135 and start dialing back the speed to 125 by 9k.

Bill "thinking the important number during the climb is reaching 70F" Watson

On 6/13/2016 9:02 PM, Kelly McMullen wrote:

Quote:
I don't suppose you were starting from ground temps of 85-90, much less departing with an engine that had already been hot soaked during a refuel stop.  I expect this weekend I will be doing at least on takeoff with surface temps above 100.
-sent from the microchip implanted in my forearm



On Mon, Jun 13, 2016 at 3:06 PM, Shannon Hicks <civeng123(at)gmail.com (civeng123(at)gmail.com)> wrote:
Quote:
I have the stock louvers installed and have had absolutely no temperature issues on climb out.  Friday I climbed straight to 11.5k at 120kts and none of my cylinders even came close to 400. 

Shannon




On Monday, June 13, 2016, Kelly McMullen <[url=mailto:apilot2(at)gmail.com]apilot2(at)gmail.com (apilot2(at)gmail.com)[/url]> wrote:
Quote:
Thanks Ed. Very helpful. I guess that shows the stock louvers are not that effective. I was thinking of putting the cowl flaps outside the louvers. I will have to but a 3-D template to verify muffler clearance, but looked okay this morning, just eyeballing it.

Quote:













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civengpe



Joined: 14 Feb 2011
Posts: 105
PostPosted: Tue Jun 14, 2016 5:54 am    Post subject: Cowl Flaps Reply with quote
Kelly,The ground temp was just north of 90 degrees. The difference may be that I have a plenum instead of the baffle seals. Once I reach 1000' I pull back the power to around 25" & 2500 rpm and lean to keep the same get as takeoff. 
Shannon


On Monday, June 13, 2016, Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)> wrote:
Quote:
I don't suppose you were starting from ground temps of 85-90, much less departing with an engine that had already been hot soaked during a refuel stop.  I expect this weekend I will be doing at least on takeoff with surface temps above 100.
-sent from the microchip implanted in my forearm

On Mon, Jun 13, 2016 at 3:06 PM, Shannon Hicks <[url=javascript:_e(%7B%7D,'cvml','civeng123(at)gmail.com');]civeng123(at)gmail.com[/url]> wrote:
Quote:
I have the stock louvers installed and have had absolutely no temperature issues on climb out.  Friday I climbed straight to 11.5k at 120kts and none of my cylinders even came close to 400. 

Shannon


On Monday, June 13, 2016, Kelly McMullen <[url=javascript:_e(%7B%7D,'cvml','apilot2(at)gmail.com');]apilot2(at)gmail.com[/url]> wrote:
Quote:
Thanks Ed. Very helpful. I guess that shows the stock louvers are not that effective. I was thinking of putting the cowl flaps outside the louvers. I will have to but a 3-D template to verify muffler clearance, but looked okay this morning, just eyeballing it.

Quote:









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Kellym



Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
PostPosted: Tue Jun 14, 2016 6:00 am    Post subject: Cowl Flaps Reply with quote
OK, that explains a lot. Did you fabricate the plenum or purchase it? If
purchased, which vendor? I only have the stock baffle seals.

On 6/14/2016 6:54 AM, Shannon Hicks wrote:
Quote:
Kelly,
The ground temp was just north of 90 degrees. The difference may be that
I have a plenum instead of the baffle seals. Once I reach 1000' I pull
back the power to around 25" & 2500 rpm and lean to keep the same get as
takeoff.

Shannon

On Monday, June 13, 2016, Kelly McMullen <apilot2(at)gmail.com
<mailto:apilot2(at)gmail.com>> wrote:

I don't suppose you were starting from ground temps of 85-90, much
less departing with an engine that had already been hot soaked
during a refuel stop. I expect this weekend I will be doing at
least on takeoff with surface temps above 100.

-sent from the microchip implanted in my forearm

On Mon, Jun 13, 2016 at 3:06 PM, Shannon Hicks <civeng123(at)gmail.com
<javascript:_e(%7B%7D,'cvml','civeng123(at)gmail.com');>> wrote:

I have the stock louvers installed and have had absolutely no
temperature issues on climb out. Friday I climbed straight
to 11.5k at 120kts and none of my cylinders even came close to 400.

Shannon


On Monday, June 13, 2016, Kelly McMullen <apilot2(at)gmail.com
<javascript:_e(%7B%7D,'cvml','apilot2(at)gmail.com');>> wrote:

Thanks Ed. Very helpful. I guess that shows the stock
louvers are not that effective. I was thinking of putting
the cowl flaps outside the louvers. I will have to but a 3-D
template to verify muffler clearance, but looked okay this
morning, just eyeballing it.



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amekler



Joined: 07 Oct 2010
Posts: 164
PostPosted: Tue Jun 14, 2016 6:05 am    Post subject: Cowl Flaps Reply with quote
Only my cylinder one goes slightly over 400 on climb out at full power
Alan
Sent from my iPhone

On Jun 14, 2016, at 8:34 AM, Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)> wrote:
Quote:
Just as a data point, I did exactly that (90, heat soaked, climb to 9). I did have one cylinder hit 400 but the rest stayed under 380 as they always do. Having problems with cylinder 1 which breaks 380 regularly climbing out during our southern summers.

But this is a stock '10 with a stock IO-540 pulling 2600rpms with a stock 2 bladed prop. I normally climb at 135 and start dialing back the speed to 125 by 9k.

Bill "thinking the important number during the climb is reaching 70F" Watson

On 6/13/2016 9:02 PM, Kelly McMullen wrote:

Quote:
I don't suppose you were starting from ground temps of 85-90, much less departing with an engine that had already been hot soaked during a refuel stop. I expect this weekend I will be doing at least on takeoff with surface temps above 100.
-sent from the microchip implanted in my forearm



On Mon, Jun 13, 2016 at 3:06 PM, Shannon Hicks <civeng123(at)gmail.com (civeng123(at)gmail.com)> wrote:
Quote:
I have the stock louvers installed and have had absolutely no temperature issues on climb out. Friday I climbed straight to 11.5k at 120kts and none of my cylinders even came close to 400.

Shannon




On Monday, June 13, 2016, Kelly McMullen < (apilot2(at)gmail.com)apilot2(at)gmail.com (apilot2(at)gmail.com)> wrote:
Quote:
Thanks Ed. Very helpful. I guess that shows the stock louvers are not that effective. I was thinking of putting the cowl flaps outside the louvers. I will have to but a 3-D template to verify muffler clearance, but looked okay this morning, just eyeballing it.

Quote:
















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civengpe



Joined: 14 Feb 2011
Posts: 105
PostPosted: Tue Jun 14, 2016 6:50 am    Post subject: Cowl Flaps Reply with quote
Kelly,I purchased my plenum from rvbits. Easy to install.  
http://rvbits.mybigcommerce.com/products/RV10-CARBON-PLENUM-LID.html

Shannon
On Tuesday, June 14, 2016, Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)> wrote:
Quote:
--> RV10-List message posted by: Kelly McMullen <kellym(at)aviating.com>

OK, that explains a lot. Did you fabricate the plenum or purchase it? If purchased, which vendor?  I only have the stock baffle seals.

On 6/14/2016 6:54 AM, Shannon Hicks wrote:
Quote:
Kelly,
The ground temp was just north of 90 degrees. The difference may be that
I have a plenum instead of the baffle seals. Once I reach 1000' I pull
back the power to around 25" & 2500 rpm and lean to keep the same get as
takeoff.

Shannon



On Monday, June 13, 2016, Kelly McMullen <apilot2(at)gmail.com
<mailto:apilot2(at)gmail.com>> wrote:

    I don't suppose you were starting from ground temps of 85-90, much
    less departing with an engine that had already been hot soaked
    during a refuel stop.  I expect this weekend I will be doing at
    least on takeoff with surface temps above 100.

    -sent from the microchip implanted in my forearm

    On Mon, Jun 13, 2016 at 3:06 PM, Shannon Hicks <civeng123(at)gmail.com
    <javascript:_e(%7B%7D,'cvml','civeng123(at)gmail.com');>> wrote:

        I have the stock louvers installed and have had absolutely no
        temperature issues on climb out.  Friday I climbed straight
        to 11.5k at 120kts and none of my cylinders even came close to 400.

        Shannon




        On Monday, June 13, 2016, Kelly McMullen <apilot2(at)gmail.com
        <javascript:_e(%7B%7D,'cvml','apilot2(at)gmail.com');>> wrote:

            Thanks Ed. Very helpful. I guess that shows the stock
            louvers are not that effective. I was thinking of putting
            the cowl flaps outside the louvers. I will have to but a 3-D
            template to verify muffler clearance, but looked okay this
            morning, just eyeballing it.




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greghale



Joined: 10 Jan 2007
Posts: 91
Location: Tulsa, Oklahoma
PostPosted: Sat Jul 30, 2016 2:37 pm    Post subject: Re: Cowl Flaps Reply with quote
I had the same problem with high CHTs during climb 400 degrees. I would have to climb at 125 kts to keep them cool which gave me a climb of 300fpm. I copied an idea someone had on the forums. The cowl flaps fit tight under the muffler and fold when closed. This allows for fences to be present on both sides of the cowl flap. My RV10 now can climb at 100-110 and show 1000fpm in the climb and the CHTs run around 350-380. I live in Oklahoma and they have been a big help in the climb performance. I have their details and drawings on my web site www.nwacaptain.com/cowl_flap.html
Just another idea for you.

Greg....

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Kellym



Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
PostPosted: Sat Jul 30, 2016 4:49 pm    Post subject: Cowl Flaps Reply with quote
Thank you very much Greg. Your page certainly validates cowl flaps as a
way to fix high CHTs. While others have added shark's gills and other
louver varieties, I always figured they would add drag in cruise and not
give you the control of cylinder temps that cowl flaps do. I remember
the summer I spent in OKC where 90 seemed the equivalent of 100 anywhere
else. Where frozen goods would melt between the store and the car. Not
my favorite spot to reside.

On 7/30/2016 3:37 PM, greghale wrote:
Quote:


I had the same problem with high CHTs during climb 400 degrees. I would have to climb at 125 kts to keep them cool which gave me a climb of 300fpm. I copied an idea someone had on the forums. The cowl flaps fit tight under the muffler and fold when closed. This allows for fences to be present on both sides of the cowl flap. My RV10 now can climb at 110 and show 1000fpm in the climb and the CHTs run around 350-380. I live in Oklahoma and they have been a big help in the climb performance. I have their details and drawings on my web site http://www.nwacaptain.com/cowl_flap.html. Just another idea for you.

Greg....

--------
Greg Hale rv10 -- N210KH
www.nwacaptain.com


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