Today's Message Index:
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1. 08:31 AM - Re: CH640 fuel tank floats (steveadams)
2. 01:11 PM - Re: CH640 fuel tank floats (pilot4pay)
3. 01:26 PM - Re: CH640 fuel tank floats (jstruhar)
Message 1
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| Subject: | Re: CH640 fuel tank floats |
The senders I installed were the same as pictured. There is little guidance in
how to install the senders provided in the drawings. I have enclosed photos of
how I bent the float to measure fuel level at the most inboard portion of the
tank. If you have the float straight into the tank, it will read empty when there
are still a fair amount of fuel left due to the dihedral of the wing. It's
a bit of a battle getting it in the tank (don't cut yourself), and I had to
file the opening a bit to be able to get it in and out. You do not use the backing
plate supplied with the sender, just tap the holes directly in the side of
the tank. Also, make sure the set screw is good and tight, and use some locktite
on it so the float won't twist. They have functioned well this way for 7+
years. I also installed aluminum fuel lines instead of the supplied hoses so
they would not have a short service life and have to be changed out every 5-7
years.
Steve
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http://forums.matronics.com/viewtopic.php?p=378799#378799
Attachments:
http://forums.matronics.com//files/float3_185.jpg
http://forums.matronics.com//files/float2_499.jpg
http://forums.matronics.com//files/float1_116.jpg
Message 2
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| Subject: | Re: CH640 fuel tank floats |
Steve, did you buy your tanks or build them, and what was the skin thickness? The
plans call for .025, but I have seen .032 on pictures of factory tanks, and
when I asked Zenair, they said they make them out of .025. Don't know why they
would say one thing and do another.
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Craig Smith
CH640 builder
SN: 0078
"Just think how stupid the average person is,
and then realize that half of them are even stupider!"
--George Carlin
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Message 3
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| Subject: | Re: CH640 fuel tank floats |
Craig,
Fwiw, the tanks that came with the wings I acquired are extended range factory
tanks. They are 0.025" 6061-T6. I don't see much advantage in making them 0.032".
John
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http://forums.matronics.com/viewtopic.php?p=378815#378815
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