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HomeAircraftHelicopterMain Discussion › Bad Fuel?
02-06-2006 08:24 PM  12 years agoPost 1
sje141

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Yorkshire, England

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I have some 18 month old fuel. It has been stored in the manufacturers container which is half full or half empty which ever way you look at it. Tried to use it this weekend. The engine (OS 60) would hover okay but would not climb/power out when requested. Adjusted needle,pitch curve and throttle curve but strill coldnt get engine to perform. The engine just bigged down and head speed seriously reduced until it nearly stopped. I am aware that fuel can absorb water/moisture, could this be my problem??

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02-06-2006 09:17 PM  12 years agoPost 2
jbiter

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Sebring, FL

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Possibly. Have you tried a fresh gallon yet? That should provide you the answer.

Jeff

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02-06-2006 09:49 PM  12 years agoPost 3
lightningrc

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UK

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Dont mistake it for a faulty glow plug

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02-06-2006 11:42 PM  12 years agoPost 4
raptorchris

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Mliford, CT

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If the fuel was kept out of the sunlight, and never opened, it would probably have been ok. But, since it was opened and only 1/2 full (or 1/2 empty), that leaves alot of room for moisture to be absorbed into the fuel. Try some new fuel (like jbiter said), and there is your answer.

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02-06-2006 11:54 PM  12 years agoPost 5
ChrisLaFollette

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Altha, FL

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I have never had fuel "go bad" on me but alcohol is hydrascopic or whatever it is (Attracts moisture). I make sure the jug is sealed off good and not on a cement floor or in direct sunlight. Never had a problem. Change the plug then try the older fuel, if that doesnt make a difference buy some new fuel and compare.

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02-07-2006 12:58 AM  12 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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Fuel that has slurped up some water along the way usually shows up as a motor that runs fine, but stops without explanation, or may run fine at high throttle, but run like crap in the low or midrange throttle setting.

Dave

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02-07-2006 01:11 AM  12 years agoPost 7
Raptorcop84

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Cape May Court House,NJ

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Not to throw a monkey wrench in the mix but, I had a similar problem and it was the clunk line, fine with a full tank but had problems after only burning a little fuel. Is this your problem I don't know but if new fuel dosen't help maybe this will.......Jason

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02-07-2006 02:53 AM  12 years agoPost 8
w8qz

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Grand Rapids, MI - USA

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Nitromethane is even more hygroscopic than alcohol, I believe. My experience with old fuel was that I could hardly keep the engine running, particularly at slow speeds. If you can get a decent hover, and the collective stick is at about the usual place, I'd suspect something else before the fuel.
Keep in mind that our nitro / alchol fuel always has SOME (small percentage of) water in it - it's just a question of how much is too much.

"The helicopter is much easier to design than the aeroplane, but is worthless when done."

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02-07-2006 03:31 AM  12 years agoPost 9
George Matthews

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N.W. Ohio

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Never store fuel for any period of time in anything but a full container. If you do have to store fuel in anything but a full container squeeze out as much excess air as possible and seal. That should help but the real solution is storing fuel in full bottles out of direct sunlight in a cool area and don't store where there are temperature fluctuations and up off concrete floors.

George Matthews

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02-07-2006 04:24 PM  12 years agoPost 10
CHEVPRO

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Mississauga,Ontario

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Old fuel
I have heard that moisture will travel throught the plastic over time. Everything is porous to some degree. Apparently concrete floors help this problem along.

As an aside I wonder if methyl hydrate would work the same for nitro as it does for gas (gas line antifreeze/fuel drier)???

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02-07-2006 04:37 PM  12 years agoPost 11
lightningrc

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UK

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Dont think moisture will pass through the plastic , but it will be effected by the temperature of the floor.

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