---------------------------------------------------------- Zenith601-List Digest Archive --- Total Messages Posted Wed 03/24/10: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:54 AM - Re: Re: Fuel Gauges (Jim Belcher) ________________________________ Message 1 _____________________________________ Time: 06:54:57 AM PST US From: Jim Belcher Subject: Re: Zenith601-List: Re: Fuel Gauges 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 ======================================= ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message zenith601-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Zenith601-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/zenith601-list Browse Digests http://www.matronics.com/digest/zenith601-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.