Ian has the smoothest and quietest rotary powered
airplane I have flown in
so far.
I now think I have exceeded Laura Crook
by having flown in more rotary
powered
airplanes than anyone else
:-)
107 db 30 feet away at 5800 RPM static. One small muffler under the
engine
and two small bullet mufflers under the cockpit. RV6A with nose
gear.
It is no slouch on speed either at 200 mph and 1700 FPM climb
.
Prop is 72.5 inches OD with 81 pitch.
Max RPM is 7200. 2.85:1 gear box.
It is not particularly clean
aerodynamically
with stock wheel pants and
external foot steps on both sides. No trick wing
tips.
The oil is
cooling great since he came stright out of the block with the oil
pipe to the
oil cooler. Two 7" x 8.5" x 3.5" parrallel evap cores are
working fairly
well
until the outside air temp gets over 90 F. These are smaller than the
ones
Tracy and Ed are using. Ian needs to do a bit more work on the exit
area
as the cowl tends to deflect outward indicating that the pressure inside
is
still too high.
Paul Lamar in Perth
