Chris,

Congratulations on your progress!  Because you have a pusher, there may
not be much airflow over the radiator and oil cooler when on the ground.
In flight, the cooling may be much more effective.  You are almost
there.  A water spray system for ground operation may be the answer.

I had to install a second oil cooler to keep the oil temp in line on my
Mustang II, but now, I can keep both water and oil temps below 190
degrees, even when climbing out on a hot day.  At altitude and cruise,
the temps are about 180 degrees.  If I maintained full power for an
extended time, the temps would still go above 200, so I just throttle
back a bit after I get above pattern altitude.  In the Winter, with my
cowl flap fully closed, the temps do not go above 170 degrees, even at
high power settings.  

Bob

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Chris Barber
Sent: Friday, May 25, 2012 1:33 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] High speed taxi part 2 w/nose lift

After getting my DAR inspection and Repairman Certificate a few weeks
ago, I did two high speed taxi test with disappointing results. The
engine temps on my two rotor 13b rotary were extremely high. Well into
the 250 degree range after the long taxi (9000 foot runway) and the
quick jaunt down 17R. Obviously unacceptable. I did seem to avoid engine
damage apparently by grace and the short duration.

Over the last few weeks I have focused on cooling mods. This time I
followed the advice from Paul Lamar's book "How to Cool Your Wankle"
more honestly and put the oil and coolant heat exchangers under the
engine and a bit into the airstream for solid ram air.

Today I repeated the long taxi for high speed taxi test 3. Outside temp
was 96 degrees. Temps down Hotel stayed around 165 degrees to Alpha. I
had to wait for a Grauman to take off. Ran the engine up a bit to verify
mixture. By the time I called the tower to take the active coolant temps
had gotten to about 185.

I took a breath and smoothly added power and started my run down the
center line. Speed came in as I brought power to just over 5000 RPM. I
reached 60 knots really  quickly. (posted rotation speed range). I
retarded the power a bit to maintain 60 ish knots took a mental
breath....and raised the nose. The nose actually lifted  Holy
crap....that is almost flight. I brought back power and the nose settled
(uh, by settled, I mean bounced ;-)).

Ok. While really cool to me, the coolest part was when I noticed that
when I checked the coolant temp just as the nose was down, the coolant
temp had DROPPED to the high 170's. A drop. Imagine that!!!

I pulled off at Charlie and taxied back to my hangar with the temps
around. 185. They just hit 190 before I shut down. Again, it is in the
mid 90's today.

I don't know about y'all, but this has been a pretty good day off so
far.

Thanks for your support.

Chris Barber
Houston KEFD
Velocity SE/FG
Rotary 13b turbo w/Mistral Intake
RWS PSRU/EC2/EM2
Dynon SkyView SV-7

Sent from my iPhone 4
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