What rpm do you normally see in cruise? I'm curious as Tracy pointed out that the most economical rpm for the rotary engine is 5200. When I dial my prop speed down to 1700 and lean the mixture, I see about 5100-5200 rpm and
11.2 - 11.5 gph, but this is only at about 3000 msl. I would expect lower fuel burn at higher altitudes, but that will have to wait for later.
Mark
Sorry; meant to include that, the data I took was at about 5300 RPM. I don't have enough experience with it to say that is optimum, but it does seem that 5200-5300 is a good place for moderate cruise.
Also, I haven't calibrated my fuel burn either (not sure how to do that).
See instructions for the FFCAL parameter in
Tracy's EM2 writeup. I think the default was set at 156. I've had to increase that quite a bit – I think mine is now at about 240; which just happens to be the ratio of 3:2 (rotors). Over the last 20 gallons, the measured fuel and the EM2 fuel burn agree within a few percent.
Al