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BobbyPaulk(at)comcast.net
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 Posted: Tue Mar 23, 2010 6:13 pm Post subject: Fuel Gauges |
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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.
Hope this helps
bobby - 601 XL - Fl
[quote][b]
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Z601c(at)anemicaardvark.c
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| Posted: Wed Mar 24, 2010 5:54 am Post subject: Fuel Gauges |
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On Tuesday 23 March 2010 21:09:40 you wrote:
| Quote: | 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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