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JohnF
Joined: 13 May 2010
Posts: 124
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 Posted: Thu Dec 08, 2011 10:06 am Post subject: Low Fuel Flow Indication |
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RV-12 912 ULS 53 hrs
Flew this morning in 24-degrees F after a previous night of -12F. Plane in hangar, this morning, 1.5-hrs with heater on, oil was up to over 75-deg F and engine started instantly, mag check typical drop, all normal. Take off 5100 or so RPM and 960 FPM climb. Leveled off at 9,000 MSL and 5,000 RPM then noted fuel flow of only 3.3-GPH. Typical is 4.0 or 4.1 but everything was working normally and increasing RPM increased fuel flow reading. Indication is on a Dynon D-180.
On landing I stopped on taxi way and left engine idle at 2100 or so and fuel flow showed 0.0 GPH
My "guess" is that the cold soak the previous night somehow effected the impeller in the fuel flow module and more or less slowed it down ... gas was also cold.
Your take?
John
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Fri Dec 09, 2011 5:01 am Post subject: Re: Low Fuel Flow Indication |
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John,
What altitude do you normally cruise at? If this flight was at a higher density altitude(DA) than previous flights you should expect a decrease in fuel consumption. At higher DA, if you fly at same a rpm as at lower DA, your engine is producing less power. It takes more RPM on fixed pitch prop to produce the same power as at lower DA.
If this flight is at about the same DA as previous flights, perhaps the engine is loosening up a bit. New engines are frequently tight which results in more friction drag and more fuel consumption for a given rpm at same conditions.
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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