C 170B climb fuel burn chart ??

[ghostflyer]

While my engine is a lycoming o-360 and it's running a fixed pitch prop (60in pitch) my fuel flow at takeoff is 16.2 gals (us) and levelling out out and at 2450rpm my fuel flow is 9.2 gals per hour (us) This is at sea level . At the start of take off my rpm is 2350rpm but quickly rises to 2550rpm . However on a full climb out from 2000 ft to 8000 ft ,the fuel flow sits around 16 gals a hour but due to gaining altitude the mixture has to be leaned off and fuel flow drops off to about 12 gals a hour . I have also observed at a fixed throttle setting and the nose is raised slowly the fuel flow increases by itself . I would love to have a set of graphs but so far haven't been able to source them .

[DWood]

Arash,
I would like to see some real data now will full throttle Fuel Flow verses RPM.
Thx,
Dan

[sfarringer]

My recollection is that my fuel flow gage reads about 11 to 11.5 gph at full throttle climb at low altitude.
Of course, I don't really spend much time looking at the fuel flow gage during climb......... But I'll look again next time out and see how bad my memory is........

-10C temperature today.
Full throttle climb at 80 MPH indicated, fuel flow shows 10.7 GPH.
Full throttle straight and level, fuel flow shows 11.5 GPH

[DWood]

-10C temperature today.
Full throttle climb at 80 MPH indicated, fuel flow shows 10.7 GPH.
Full throttle straight and level, fuel flow shows 11.5 GPH

Did you note the RPM at each GPH reading?
Thx,
Dan

[sfarringer]

~2550 straight and level
~2400 in climb

[DWood]

Great info - Thanks

48 170 -10C S/N 18073

Full throttle climb at 80 MPH indicated, fuel flow shows 10.7 GPH. ~2400 in climb
Full throttle straight and level, fuel flow shows 11.5 GPH ~2550 straight and level

[DWood]

Full throttle climb at 80 MPH indicated, fuel flow shows 10.7 GPH. ~2400 in climb
Full throttle straight and level, fuel flow shows 11.5 GPH ~2550 straight and level

If you or anyone else with fuel flow need an excuse to go fly again, please record the following

Temp =
Full Throttle straight and level 2550 Fuel Flow =
Pull back throttle to 2550 (if it will without being full throttle) straight and level and lean Fuel Flow =
Pull back throttle to 2500 straight and level and lean Fuel Flow =
Pull back throttle to 2400 straight and level and lean Fuel Flow =

Thanks

[blueldr]

Has the mixture control been in full rich for these figures?
Field elevation and altitude will alter these kind of values as will fuel mixture.