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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › question about nitro and oil content
04-05-2010 04:10 AM  10 years ago
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Duckster

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Brunei

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question about nitro and oil content
am usually use 30%nitro and 20%oil on coolpower LS, what does this mean, if 30%nitro and 20% oil what are the rest of 50% content in a gallon, the more oil in the fuel it run more smooth but bit hot is that right, my LHS have out of stock for 30%nitro fuel and now the only left me is cosmo 20%nitro and 18% oil what to expect in tuning with low nitro and high oil ie at 30 by 20 i have 10%different in oil but using 20 by 18 i only have 2% different in oil content will my engine run hotter or let just try with the 30% tuning and if it worst do need to lean or richen the
Needle
Trex 600,700 AND 450, GY611, GY401, OS5H, OS91HZ, MGP, HS65HB, Scorpion 2221-8,
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04-05-2010 04:15 AM  10 years ago
jschenck

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La Vista, NE.

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Most of the rest of the fuel content is Methanol.

Lower nitro content will require you to run leaner on the mixture.
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04-05-2010 04:19 AM  10 years ago
dkshema

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Cedar Rapids, IA

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30% nitro, 20% oil, the rest is methanol (methyl alcohol) and a small percentage of "other" stuff.

More oil does NOT equal more smooth running. It means more protection for your motor. Heli fuel generally has a higher percentage of oil than airplane fuel, and heli fuel generally uses synthetic lubricants, whereas airplane stuff may use castor oil, or a mixture of castor and synthetic, or straight synthetic.

The heli environment is much more harsh than the airplane environment, engine cooling is not as good as in an airplane, and heli engines are usually run at much higher RPMs for much longer periods of time than an airplane motor.

If you go DOWN in nitro percentage (say go from 30 to 15% nitro), you have to lean the needles in the carb.

If you go UP in nitro percentage (say go from 15% to 30%), you have to richen the needles.

If you're going to be flying helis, stay with an oil content at or above 18%, you really do need the lube. Since the oil doesn't burn as it goes through the motor (unless you are tuned way lean), as the oil leaves the motor, it takes some of the heat of combustion with it, further protecting your motor.

An engine run on higher nitro fuels may run cooler than one run on lower nitro fuels as you end up running the motor a bit more rich with high nitro vs lower nitro.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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04-05-2010 09:08 AM  10 years ago
russ

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england

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if everyone knows whats in the fuel why dosnt everyone mix there own juice upruss
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04-05-2010 10:11 AM  10 years ago
Busher

rrKey Veteran

Manchester, England

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if everyone knows whats in the fuel why dosnt everyone mix there own juice up
I think its because it can be a pain to mix large quantities. I have mixed my own fuel and to this day I still mess about with brews for aircraft and heli's.

Sourcing the raw ingredients and getting someone to sell you them in the uk can be difficult. Also when your mixing 5 gallon of fuel in your shed or garage you risk contamination of the fuel and yourself and should anything go wrong explosion is never a good thing when you in the middle of it
Good luck
Busher
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04-05-2010 02:00 PM  10 years ago
Duckster

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Brunei

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have just use 20%nitro and 18%oil and i onle close about 2 click leaner from 30% nitro and almost un noticeble power compare to 30%nitro, flight time increase by 2 minute, and temperature at 100c or 200f anyway thanks for the input gona try this fuel again tomorrow on 50size hope that would feel the same way on 30%Trex 600,700 AND 450, GY611, GY401, OS5H, OS91HZ, MGP, HS65HB, Scorpion 2221-8,
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04-05-2010 02:07 PM  10 years ago
dkshema

rrMaster

Cedar Rapids, IA

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if everyone knows whats in the fuel why dosnt everyone mix there own juice up
Consistency for one thing. And the more important reason -- sourcing all the materials and then mixing. Unless you're making a huge batch, you won't be able to do it economically.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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04-05-2010 05:12 PM  10 years ago
russ

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england

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Looking at all those points I can see why people don't make there own more trouble than it's worthruss
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04-05-2010 05:37 PM  10 years ago
BarracudaHockey

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Jacksonville FL

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There's more to "18% oil" than just oil. Its the makeup of the oil they use. Its also the oil package that gives the fuel its color so Morgans uses one oil package for its heli fuel (Red) and another for its airplane and 4 stroke (and 15 percent nitro heli) fuels thats green.

You can actually buy bottles of the green oil if you want to be bothered mixing your own.
Andy
AMA 77227
http://www.jaxrc.com
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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › question about nitro and oil content
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