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Author Topic: Fuel cutoff for Free Flight Gas  (Read 644 times)
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flydean1
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« on: January 03, 2019, 11:12:35 PM »

I'm looking for some easily fabricated remote fuel cutoff to link up with my engine timer.  Drawings or even better photos would be great.

Thanks in advance.
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billdennis747
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« Reply #1 on: January 04, 2019, 03:38:48 AM »

I'm looking for some easily fabricated remote fuel cutoff to link up with my engine timer.  Drawings or even better photos would be great.
A line pulling on soft silicone fuel tube running between two wire loops.
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Re: Fuel cutoff for Free Flight Gas
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flydean1
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« Reply #2 on: January 05, 2019, 09:48:53 PM »

Somewhere I saw a drawing of an easily made pinch-off using a torsion (I think) spring.  Klaus Salzer, I think, made the drawing but I could be wrong.  Searched my data bases to no effect.  I could really use a clear close up photo or drawing.
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billdennis747
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« Reply #3 on: January 06, 2019, 02:53:30 AM »

Yes, a safety-pin type torsion spring attached to the fuselage by one arm and the other one pressing down on the tube. The arm is lifted onto a spacer to release the tube and pulled off by the line
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royv
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« Reply #4 on: January 07, 2019, 06:17:42 PM »

If the motor is suction fed fit an RC carb and arrange for it to spring fully shut when the timer goes off.  If the motor is pressure fed fit a flood-off.  The off clamp, bolted to a mounting lug, is very simple to make with bent wire and a bit of tinplate.
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flydean1
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« Reply #5 on: January 07, 2019, 07:30:37 PM »

Bladder pressure--no rc (never capitalize) carb within several miles.  Safety-pin sprung cutoff under design.
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Steve J.
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« Reply #6 on: January 08, 2019, 04:54:22 AM »

https://app.box.com/s/oaf1stsdhvopa0176omt1orj6u5qdln0
I don't know how to post pics on here...
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NormF
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« Reply #7 on: January 08, 2019, 12:05:50 PM »

Fourmost Products makes a simple shut-off, but I think it's too large for FF use, but maybe you can use the idea. See: http://www.fourmostproducts.com/our-products/fuel-fittings/
Bruce Hannah has the coolest home made shut offs, maybe you can get him to post pics.
Personally, I just use the Texas Timers with shut-off, but i think they are becoming scarce?

Norm
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FF Bruce
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« Reply #8 on: January 08, 2019, 04:25:10 PM »

Norm I didn't know you've seen them. Right now on e bay there are a few fuel shut off's look in controlline/free flght
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flydean1
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« Reply #9 on: January 08, 2019, 11:13:00 PM »

Thanks Steve J.  That's exactly the drawing I remember seeing.  Nice to know I wasn't nuts.
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