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n1cxo320(at)salidaco.com
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 Posted: Tue Apr 15, 2008 4:23 pm Post subject: Louvers on the bottom of the cowling on RV6A |
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I am considering putting the louvers that Avery (and perhaps others) sell on the bottom cowling of my RV6A. I do not have a temperature problem but I know there is a build up of pressure in that area and I wondered if allowing more 'escape' area for the cooling air from across the cylinder heads would not reduce cooling drag and perhaps give me a minor bit of speed increase, or if not, then the ability to operate in REALLY hot climates with full power and have lots of cooling air flow.
Also, those who have done this, how did you mount the lourvers? Just rivet them on the exterior of the lower cowl, inside the cowling, or do some inletting, or what? Other observations?
You comments/experience would be appreciated.
RV6A flying now 13-years.
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ronlee(at)pcisys.net
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| Posted: Tue Apr 15, 2008 4:57 pm Post subject: Louvers on the bottom of the cowling on RV6A |
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These are #8 bolts I believe with washer and nut on the inside:
http://home.pcisys.net/~ronlee/RV6A/Cowl_Louver_Small.jpg
Ron Lee
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chagen(at)hagenrealestate
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| Posted: Tue Apr 15, 2008 6:57 pm Post subject: Louvers on the bottom of the cowling on RV6A |
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John,
This was just finished on my RV6A this past week. I was having a CHT and oil temp problem so it was part of the remedy plan. The outside air temps are not high enough to verify success, however.
I wanted to install the louvers on the inside of the cowl but the thickness of the fiberglass honeycomb on the bottom looked like it would be a problem as to final finished look (my plane is painted).
The louvers were installed on the bottom, outside of the cowl. I had the louvers powder coated to a color very close to my a/c paint color, beveled the edges and used screws with locking nuts. Before installation, I put rtv over the open cut of the honeycomb. I also added additional heat shield material in side the cowl and over the honeycomb and onto the outside of the cowl (but under the louver). I just don't want the heat to attack the open honeycomb of the fiberglass.
I purchased my louvers from Alex D.
Hope this helps.
Craig Hagen
N289CH RV6A 420 hours
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randy(at)romeolima.com
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Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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| Posted: Tue Apr 15, 2008 8:18 pm Post subject: Louvers on the bottom of the cowling on RV6A |
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In a message dated 04/15/2008 7:27:00 PM Central Daylight Time, n1cxo320(at)salidaco.com writes:
| Quote: | | I am considering putting the louvers that Avery (and perhaps others) sell on the bottom cowling |
>>>
On my -6A, I opted for a simple cover plate held by 4 platenuts to cover the slot aft of the nose leg vs. the complicated mechanisms described in the manual for the pivoting cover and associated bracketry. I believe this allowed better airflow due to nothing interfering with exit air in the area. Cools fine, but only 150 hp.
http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id=5289
I recently worked on a -7A with an IO-360 using a Vetterman rear-crossover system. While discussing the rear hangars with Larry Vetterman himself, he claimed that the only way they could get sufficient cooling on this system (nose OR taildragger) was to add the louvers. After ruminating on this a bit, I instead fabricated a small plate at the rear of the gearleg slot that literally "spreads" the slot wider- this causes the cowling outlet to curve downward, increasing the size of the opening about 10-15%, I'd estimate. Platenuts on each side of the plate are used to tie the cowl halves together and also serve as rear mounting points for the Fairings-etc. nosegear intersection fairing. This Florida-based -7A has no cooling issues so far...
From The PossumWorks in TN
Mark
http://websites.expercraft.com/n51pw/
It's Tax Time! Get tips, forms and advice on AOL Money & Finance.
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From The PossumWorks... |
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n395v
Joined: 10 Jan 2006
Posts: 450
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| Posted: Wed Apr 16, 2008 4:38 am Post subject: Re: Louvers on the bottom of the cowling on RV6A |
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I had serious CHT problems in my F1 especially climbing on hot days or fully loaded..
Glassed the louvers in the lower cowl.
Project can be seen here.....
http://www.bearcataviation.com/album_frame.asp?menuID=6
Amazing difference in CHTs after. Did not see any change in speed or performance.
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n1cxo320(at)salidaco.com
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| Posted: Wed Apr 16, 2008 5:54 pm Post subject: Louvers on the bottom of the cowling on RV6A |
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Thanks for the photo Ron, that shows me what I wanted to know.
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