charles.harbert wrote:

Paul, I spoke to Dave recently and  has not had any cooling problems since he
installed a larger radiator on his RV6.  He does use the stock air inlets to
bring in cooling air which slightly pressurizes the cowl before it escapes thru
the bottom radiator. It goes out thru the bottom of the cowl where it is at
reduced pressure from his cowl design. You could argue that it would be better
to not have the cooling air flow over the engine before it goes thru the
radiator, but it's working for him.

The thing that I found out is that  you have to be careful about dumping rad
exit air into the cowl, if your bringing cooling air into the cowl from another
inlet. The cowl is then under pressure and this reduces the pressure
differential across the rad. which prevents cooling.

Dave's plane is working pretty well. He cruises at 9,500' at 180 mph (5,200 rpm)
on 7.5 gph. He's had it over 200 mph using an IVO 3 blade prop, so it can be
done.

Thanks for the report Chuck. Hopefully Dave will enter it in the
Apple Valley to Copperstate dash next October.

IMHO Dumping rad air into the cowl is fundamentally no different than a 
Cessna or Piper dumping used cooling air into their cowls.

How's you airplane coming? Would you have
any drawings on the modifications you made to the Ross PSRU for
use with your turbo three rotor? I am particularly interested in
where those oil spray bars are located.

Paul Lamar
 
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