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1. 06:54 AM - Re: Re: Fuel Gauges (Jim Belcher)
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On Tuesday 23 March 2010 21:09:40 you wrote:
> List,
> My experience with the fuel gauges no matter which brand it is - If it is
> float operated and mounted on or near the inboard end of the tanks the
> float will rest against the top of the tank at about 7.5 ~ 8 gallons. This
> is due to the dihedral of the wing. The outboard end of the tank is higher
> than the float when it is jammed against the top of the tank. I am using
> the Dynon D-180 and after about 8 gallons you will notice on filling
> further the output of the gauge never changes. I set my tanks to read 7
> gallons when full and they stay on seven until it gets below that. They
> are extremely accurate from seven down. The last 30 min. is the most
> important. Most gauges are only accurate when reading empty.
I remember a question from the A&P test ..."when must a fuel gauge be
acccurate?" The answer was, when it is empty.
Neither of the certificated aircraft I've owned were accurate at full fuel;
only when they were empty. Yep, they both had float sensors in the wing.
We have the freedom in an experimental aircraft to use whatever kind of
sensors we wish. I doubt anything other than a more complex capacitive sensor,
or a fuel flow meter, is likely to give us a better answer.
I consider Bobby's comment above to be right on target: the time that's it
important is when the tank is empty.
--
=======================================
Jim B. Belcher
BS,MS Physics
A&P/IA
General Radio Telephone Certificate
Instrument Rated Pilot
Retired Aerospace Technical Manager
Semi-proficient Househusband
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