Twin Engine Fuel System - RCCanada - Canada Radio Controlled Hobby Forum
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Old 03-09-2013, 08:54 AM   #1
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Twin Engine Fuel System

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Before my condition deteriorates to where I cannot fly anymore I would like to fly a twin engine aircraft with nitro engines. Has anyone designed a single tank system that works properly?

First the factors: If the right engine quits, on some aircraft are controllable. If the left engine quits both torque and the position of the right engine make the aircraft turn left. The Perry pump bypass system pumps the fuel through a "T" fitting and back to the tank, with the right angle part of the "T" plumbed to the carb. This way the engine thinks that the tank is an inch from the carb. I was going to use the left engine to power the pump and run the same fuel through a "T" fitting at the right engine also and back to the single tank. This way if the left engine quits the right one will also quit. That is the theory. When I can dig my test stand out of the snow bank I am going to set up a pair of engines to see if it works. What do you think?

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Last edited by kip51035; 03-09-2013 at 06:34 PM. Reason: added theory
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Old 03-09-2013, 04:51 PM   #2
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Re: Twin Engine Fuel System

When drawing fuel from more than 8-10" will need a pump, as you probably know. A Perry pump may work, what length of fuel line do you anticipate.
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Old 03-09-2013, 06:16 PM   #3
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Re: Twin Engine Fuel System

Dual exhaust pressure fittings would also help I think Cliff. Lines as short as possible.
I would give it a try.

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Old 03-10-2013, 09:01 AM   #4
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Re: Twin Engine Fuel System

Hi Cliff ,, check out the twin otter by hanger 9 ,, and also check out a gizmo called TWIN SYNC it is an electronic controller that sync's your engines to the same rpm and has a fail safe that will take the running engine to an idle if one quits.. the otter is a flat bottom wing and all the info I can gather on it.. it is suppose to be a very forgiving plane and a gentle flyer..basicaly it is a twin engine trainer.. my otter was suppose to be going to the bench next to get assembled but got kicked back by two planes... opppss ... anyway.. I have for my setup as above but I am using the saito 56 engines .. I had checked with the h9 people and they say it will also fly very nice on a pair of saito 40 4 stroke engines.. the twin sync is about 100 bucks and would be less complicated than rigging a fuel system..

the otter is also a very simple construction ,, about the only gluing required is the engine naccels to the wing.. and the rudder hinges.. pretty much everything else is bolt together.. or pre attached in the factory.. the flaps are a really nice thing that it comes with..
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Old 03-10-2013, 12:19 PM   #5
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Re: Twin Engine Fuel System

One of the best twins for engine out must be the PBY because with the high mounted wing the nacelles can be much closer to ceterline. Don't personally know yet, just building one.

The Hobbico Twinstar ( is supposed to be a good bet and the price is right! Seems the trick is setting the right / left side thrust angles correctly and getting on the ground at reduced power as soon as you have an engine out.

Clean fuel and setting the mixture for something less than max lean plus not obsessing with synchronization seems to be key. The auto synch previously mentioned looks like a neat plan if your model is an engine out handful.

Good luck in your endeavour Cliff!
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