Basically
the reason for the low rpm numbers while flying level is because the power was
pulled back. MAP was only 19”. What rpm do you get at
19” MAP?
Al, I think that my
RPM at that MAP is about 4400 RPM's, but I have a ground adjustable IVO, and I
have changed it several times, trying to see what changes I get in climb
performance vs cruise. I have flown quite a bit at 60-65% power, and
I get a fuel burn rate of about 7-8 gallons per hour, flying at about 140
kts. I found that is probably my best "economy" cruise setting.
Steve;
My rpm at 19” was about 4450, so
that is consistent. I think the issue is that it was not 65-70%
power. The fuel burn was reading 16-18 gph, (mixture bar on EM2 showing
about 2/3 scale) which is translating into the high power readings. I
think I have to change the FF CAL constant.
Tracy – I’ve left the default 151 in for FFCAL. Prior
to running a couple tanks of fuel to calibrate, is there some other good guess
for what this should be for a 20B with 500-550 cc/min injectors? I’m
wondering whether for three rotors it should be 1.5 times the number for 2
rotors.
I think that two
pilots for that task is a much safer approach.