I was back in the air over the weekend with newly filtered EC2 board, and a
reduced pitch Catto prop.
All the settings in the EC2 that I can display are now remaining as they
were set. That's a good thing, but there is still something wrong in
controller A. The mixture gets leaner as I climb, and the only thing we can
figure out is something with the induction air temp sensor. Mine originally
came with the 10K thermistor sensor, and Tracy thinks the newer version of
the box I got last year may be looking for 3K thermistor. I wasn't aware of
the change, so maybe that's it - haven't figured that out yet.
Controller B works fine.
Lower pitch prop gives me about 400 more engine rpm at static run-up, 500
more for climb (5600), 600-700 more at WOT level (6450). The acceleration
on take off is very good - from rolling start to about 65-70 kts [75-80 MPH] in
1000-1100 ft, and mains come off about 400 - 500 ft later (DA about 2000').
It will climb 1500 fpm as soon as the gear comes up while burning about 19
gph.
Nice level cruise at 160 ktas [184 MPH] and about 10 gph. High speed of 200 ktas
[230 MPH] at 19 gph, 2970 rpm on the prop. Very smooth at any speed. Still
calibrating fuel flow so the burn numbers may be a tad off.
Coolant temps are fine for any power - stay at about 180-190 climbout, level
cruise drop to 150-160; oil temps get high (220F) in sustained climb (after
rapid climb to pattern altitude) so operational limit is about 500 fpm with
85F OAT, and a bit more for lower OAT. At cruise drops to 180-185 F. Cooler
oil temps in/out and air temps in/out shows that it is air flow limited. At
some point I will play with the wing root cooler exit fairing to see if it
will enhance flow.
EGTs peak at about 1725F WOT, and run about 1650 cruise power (not leaned,
maybe close to stochoimetric).
This is all at a total weight of about 2100 lbs.
Al
Thanks for the report Al. I am very glad to see people are now getting
their rotaries to cool. Here is a picture or two of Al's 3 rotor powered airplane for
the new guys.
Paul Lamar ...No rotor no motor.
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