Ken Powell wrote:

Paul,
I will not be able to make it to OSH this year but would like to ask you
to stop by the Powersport display to check out their cooling systems.  I
have gone back 'to the drawing board' on my configuration, but would
really just like to copy the Everette Hatch / Steve Beckam
configuration.  How did they mount the radiators?  If you could find any
information I would appreciate it.  If you happen to run across Allen
Tolle be sure to discuss this with him.

BTW, I have the rotor housings ready to ship to you, but I am waiting on
the Kinsler catalog to arrive so that I can order the parts from them.
I am really excited about this.  I have even considered turning the
engine faster (up to 7000 RPM) and using a shorter prop (64" to 66").  I
think that I would need to shorten the intake to about 20" for this
strategy.  It's tough not knowing how to calculate this stuff and just
having to guess; however, intake lengths can be easily turned by adding
a section of hose.

Ken Powell

OK Ken I will see what I can do but I still think one rad under the engine 
and a side exhaust is the way to go. Everett's arrangement did not cool 
all that well. If you put the scoop low on the front of the cowl you will 
get good benefit from the prop slip stream on the ground and during takeoff. 

Be prepared to run a tuned exhaust if the muffler combined with the PP causes 
back pressure problems. You might want to hinge your canopy on the the same 
side as the 32 inch long exhaust pipes might need to come out :-) Wear ear plugs!

I am real curious how the new Power Sport guys cooled their RV6.
Also the Mecan guys from Switzerland if they have flown their engine
so far.

The short prop might work. It is a question of the prop eff. falling off
faster than the HP increases or vice versa. MPG will suffer for sure.

BTW hold those messages for a week guys during OSH. No more messages
will be forwarded after late tonight CA time.

Also there is a picture here of Everett's exhaust system and a chart
from a Mazda paper. Just bring the one meter long pipes on around the 
right side of the airplane and let them come out the side. Put a cowl
flap on there where the pipes come out with a bit of streamlining
on the firewall.  Forget the muffler.

Paul Lamar
 
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