Twin engine multi-tank setup
08-29-2005 | 06:28 PM
#1
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From: , UNITED KINGDOM
Twin engine multi-tank setup
Ok, so heres my problem - not specifically an aeroplane one, but glow engines, and i thought i'd find a good knowledge base here 
I am building a hovercraft with separate lift and thrust engines (Thunder tiger GP42 for thrust, and Pro46 for lift)
For the testing i was using individual 4oz tanks for each engine, but they run dry after about 10 mins.
I plan to use a single 50oz tank to feed both engines, with the thrust engine having a 2oz header tank to lift the clunk in line with the carb needle, and the larger lift engine providing the pressure.
My question is pretty basic :
Will running two engines of a single exhaust pressure line be ok, or should i use both?
Will pressurising the inlet to one engine from another flood the engines ?
Is this the best way of doing it ??
(quick schematic below)
I am building a hovercraft with separate lift and thrust engines (Thunder tiger GP42 for thrust, and Pro46 for lift)
For the testing i was using individual 4oz tanks for each engine, but they run dry after about 10 mins.
I plan to use a single 50oz tank to feed both engines, with the thrust engine having a 2oz header tank to lift the clunk in line with the carb needle, and the larger lift engine providing the pressure.
My question is pretty basic :
Will running two engines of a single exhaust pressure line be ok, or should i use both?
Will pressurising the inlet to one engine from another flood the engines ?
Is this the best way of doing it ??
(quick schematic below)
08-29-2005 | 08:38 PM
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From: Mary Esther, Florida, FL
RE: Twin engine multi-tank setup
With that setup if you start the lift engine first the thrust engine will flood. And when it's running, even though you have the head tank, hydraulically it will still see the fuel lift as being from the main tank.
A real can of worms.
Two ways that have proved to be easy and both work well:
1) Install a Perry VP-30 pump on each engine, and use separate clunks in the main tank - one for each engine. The muffler pressure ports would be plugged or left open, and the tank vented to the atmosphere.
2) A full pressurized fuel system using either the Iron Bay or Cline regulators. Still with two clunks, but in this case both engines would be feeding muffler pressure to the fuel tank through check valves.
The Perry two pumps would cost roughly 1/2 the price of the Iron Bay/Cline system.
In both cases the head tank would add nothing to the reliability, and would raise the center of gravity. Best left off.
Bill.
A real can of worms.
Two ways that have proved to be easy and both work well:
1) Install a Perry VP-30 pump on each engine, and use separate clunks in the main tank - one for each engine. The muffler pressure ports would be plugged or left open, and the tank vented to the atmosphere.
2) A full pressurized fuel system using either the Iron Bay or Cline regulators. Still with two clunks, but in this case both engines would be feeding muffler pressure to the fuel tank through check valves.
The Perry two pumps would cost roughly 1/2 the price of the Iron Bay/Cline system.
In both cases the head tank would add nothing to the reliability, and would raise the center of gravity. Best left off.
Bill.
08-29-2005 | 11:08 PM
#4
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RE: Twin engine multi-tank setup
My experience with multiple tank configurations indicates that each engine system should be isolated from the other. However a long time ago I had a twin with two outboard header tanks supplied from a single center tank. At the time both muffler pressures were supplied to the center tank. Today I use two center tanks and two header tanks. No experience exists with pumps or regulators.
Bill
Bill
