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John,
After the inlet, it does expand into the plenum. Mine is not as tall as
yours, but it is pretty tall and the front end and is the width of the
radiator. I don't want to lose races, but I don't want to burn up the
engine either. If I make the scoop removable, I can always remove it, or
modify it if I figure out a better way.
To increase the expansion area, I would have to modify the lower cowling
(again) The cowlings are heavy enough now that I probably will redo them
sometime,. I could probably save 15 lbs real easy between both of them.
I'm looking at the scoop as a stop-gap measure to get the temps down, and
then figure out a better mousetrap, while still flying. I would really like
to understand this expansion area more, before attempting another cowling.
I only want to build it one time. If you recall, I started with the plans
cowling from Featherlite, and modified it to work with the rotary. The
bottom NACA inlet area is the stock portion. I modified the aft
area )lower) to accommodate the radiator.
I've also considered installing deflectors inside the plenum to help the air
flow through the radiator and air cooler. Right now I'm just letting it
find it's way in, up, and through, which isn't real efficient.
I'm also stealing engine intake air fro the plenum. At high RPM's that is
probably pretty significant. I could move it to one of the armpit scoops
without a whole lot of trouble.
Steve
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of John Slade
Sent: Sunday, June 06, 2004 9:22 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: opinion
The 1-3/4 is from the fuselage to the inside of the scoop. Measuring from
the NACA which is recessed would be about another 1-3/4 for a total of
3-1/2". Maybe I didn't explain that very well.
OK, then. So you're NACA is the same size as mine. I think Greg Richter may
have gone the direction you're proposing - add more scoops and it'll cool. I
think he had a top speed problem (now solved with a turbine :). Do you have
any kind of internal expansion area as described by Terry? I'd suggest that
this would be the place to start... unless you're prepared to loose all the
races we have later :)
Regards,
John
Homepage: http://www.flyrotary.com/
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