Larger exit is one thing but has anybody had significant cooling improvement with a cowl flap?  When I tried it on the -4 it didn't do any good and I can't recall one that did.  I'm going to put one on the RV-8 but only to INCREASE temps in cold weather and high altitudes (and decrease drag).

 

BTW, the best exit mod I did was to streamline the outlet nozzle (eliminate sharp turns & corners) but left it the same size.  This alone dropped my temps 6 deg. F. (which is a BIG deal, every degree improvement seems to be a struggle).

 

Tracy

 

On 9/27/07, David Staten <Dastaten@earthlink.net> wrote:

Mark Steitle wrote:

>   It appears that I need more cowl exit area.  Stay tuned.  I'm still
> working on this one.


I wont be surprised if we need more as well. We've got twice the normal
inlet area at the moment - with armpits AND NACA's available to us for
use. All of it leaving a stock exit out the back of the cowl. We MAY
need a cowl flap of sorts for VX/VY ops and once in cruise, close them
up.But Chris has a good point - dont cut any holes in the cowl unless or
until we know we need them.

Keep up the good work, mark

Dave

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