Dennis,
Could you please describe the “hump” a little
better? Are you talking about trying to turn the air in
the plenum? Pictures perhaps?
Bill B
From: Rotary
motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of Dennis
Havarlah
Sent:
Sunday, October 31, 2010 10:30 PM
To: Rotary motors in aircraft
Subject:
[FlyRotary] Re: FW: [FlyRotary] Ready to fly again
My Catto
76X88 prop for the Renesis has a maximum cord of 6 ".
If yours is wider I believe it is too big for the
engine. My static was 5730 rpm on a 90 deg day.
When I
first started flying the rotary (three years ago) I
had oil and water cooling problems - I used a home
made wind tunnel 2 inches wide inserted into the cowl
and blew air into it with a squirrel cage blower from
a home A/C unit. I used a manometer on the back side
of the radiator to measure air pressure as the air
came through the radiator. I found I needed a good
hump in the lower part of the cowl inlet to deflect
incoming air evenly through the oil and water
radiators. My radiators are side-by-side.
You might
use a GPS to compare with the air speed gages to make
sure they are in the ball park.