It has been bugging for me a while and I have found one old post ( http://www.vansairforce.com/community/showthread.php?t=88963
on this altitude related FF subject:
my fuel flow indication does not read accurately with increasing altitude. I am pretty happy with my k-factor of 71000 and the flow reads correctly approx. 4.5 gal at 5200RPM at lower altitudes. See graphs attached of a longer cross country flight at various altitudes:
Top chart : FF and DA
Bottom chart: FF and RPM
Measuring the fuel quantity with a dip stick shows an avg of 4.5gal burnt per hr post flight.
Appreciate your help.
on this altitude related FF subject:
my fuel flow indication does not read accurately with increasing altitude. I am pretty happy with my k-factor of 71000 and the flow reads correctly approx. 4.5 gal at 5200RPM at lower altitudes. See graphs attached of a longer cross country flight at various altitudes:
Top chart : FF and DA
Bottom chart: FF and RPM
Measuring the fuel quantity with a dip stick shows an avg of 4.5gal burnt per hr post flight.
Appreciate your help.