Fuel Tank Size for DLE 20 and Electronic cutoff?? - RC Groups
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Feb 13, 2011, 01:18 PM
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Fuel Tank Size for DLE 20 and Electronic cutoff??

Nearing completion of my TF Seafury. I am putting a DLE 20 on it and was wondering ow large of a fuel tank to use. The plans call for a 12oz for a .60 nitro, but I wasn't sure if I should go larger or smaller.

Also, what is the censuses on an optical cutoff. Should I have one or is a mechanical switch acceptable?

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Feb 13, 2011, 04:19 PM
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Optic cut off is a must in my opinion....a gasser at an event needs 2 or more ways to kill an engine....trim is one....either a choke servo or an optic kill switch is another......with an optic kill switch and 2.4 lose signal lose ignition.....
I have several gasser all have optic kill......
Please don't fly without one...
tank size...a 12 oz will be plenty...remember you need a different stopper and fuel lines for gas...and the tank is plumbed differently...no exhaust to worry about.....
Feb 13, 2011, 04:35 PM
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Definately don't go with a larger tank, unless you are planning marathon flights or like to haul extra weight. My G20 with a 12oz tank gives me 2 flights of 8-10 minutes with reserve. It's on a YAK 54, so I'm not going full throttle all the time. A 10 oz tank might be a better choice for a war bird, depending how long flight duration you expect.
Feb 13, 2011, 06:46 PM
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No I was thinking smaller, but I wasn't sure if I should go 8 or 10 oz. 8-10 minutes of flying time with a suitable landing reserve is plenty. I have the gas stopper and Tygon lines.

Jetmech, Thanks for the advice on optical cutoff, guess I need to pop for one.
Feb 13, 2011, 07:49 PM
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Fuel consumption for a 20cc gasser is around .7oz/minute at full throttle (actually a touch less than that). A 10oz tank should be good for a bit over 14 minutes at full throttle operation.

I have used mechanical ignition cut off for the past 12 years I have been flying gas, but I have bought one of the electronic gadgets that are popular now, will put it on my next plane. One gnawing thought troubles me about it, and that is that it one more potential fail point in the electronic system. I will give it a try just because I like new toys from time to time. So far, I have never experienced a need for one. I'll see if it's worth the trouble.
Feb 15, 2011, 06:00 AM
Registered User
Jim ignition cut off wether its electrical or mechanical is a fail point.....electrical is alot more reliable than mechanical

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