Home > VansAirForceForums

- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

Old 11-18-2016, 08:31 AM
rvdave rvdave is offline
Join Date: Jun 2005
Posts: 350
Default Louvre or not

I'm nearing final assembly but have not yet cut louvers into bottom cowl. Is there anyone who thought they would wait to see if they needed them and found out that they did help CHT's after installing them?
Some of the advice I received is wait to see if you actually have a problem but I don't know if there's anyone flying around without louvers that has acceptable temps?
Dave Ford
Cadillac, Mi
Reply With Quote
Old 11-18-2016, 09:48 AM
aturner's Avatar
aturner aturner is offline
Join Date: Jan 2005
Location: Clarion, Pennsylvania
Posts: 502

Dave, I installed louvers as per plans and later regretted CHT's were plenty low, so I had added that extra drag for little benefit. I went back (after paint, unfortunately), drilled out those louvers, and installed blanking plates.


I've flown with the plates in place for a year, and found CHT's to be satisfactory. The one scenario that demands care is a short fuel stop in hot summer weather....the ensuing climb-out demands a higher climb speeds than usual to keep CHT's under 400F. This is not an inconvenience to me, and now I'm trying to figure out now how to patch those holes back up permanently without creating too much of a repaint job.

I did several other things on the cowl that I think have helped with cooling and minimize drag. For one, I removed that center support that is off-center, creating turbulence in the exit,

and built a replacement with the center support centered and nicely faired into the nose gear in flight.

I left the cowl full length, so it extends an inch or so behind the firewall, and I used baffle seal to seal the gaps around the nose gear. I think attention to details in this area pays off.

I would suggest to builders that they at least install the louvers with screws and nutplates, instead of rivets, so they could be more easily removed.
-Andy Turner
RV-10 N784JC
Reply With Quote
Old 11-18-2016, 11:34 AM
Michael White's Avatar
Michael White Michael White is offline
Join Date: Jan 2005
Location: Cartersville, Georgia KVPC
Posts: 930

Originally Posted by aturner View Post
It's really not my habit to intrude,
And furthermore I hope my meaning won't be lost or misconstrued,
So I'll repeat the risk of being crude,
There must be fifty ways to leave your louver.

This is number 17....

(Apologies to Paul Simon)
VAF #136
N424LZ Reserved
Reply With Quote
Old 11-18-2016, 12:58 PM
DanH's Avatar
DanH DanH is offline
Join Date: Oct 2005
Location: 08A
Posts: 8,078

Home run, Mr Moose!
Dan Horton
Barrett IO-390
Reply With Quote
Old 11-18-2016, 02:42 PM
rvdave rvdave is offline
Join Date: Jun 2005
Posts: 350

Good info Andy, I will look into that.
Dave Ford
Cadillac, Mi
Reply With Quote
Old 11-18-2016, 04:38 PM
Electrogunner Electrogunner is offline
Join Date: Aug 2016
Location: Quarryville ,pa
Posts: 350
Default Electric cowl flap

Or this would be a good solution for not having excess drag when not needed. I seen someone with a rv10 had them installed.
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 04:43 PM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.