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Old Feb 17, 2012, 08:02 PM
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glow fuel question

I picked up a gallon of omega castor /synthetic - 10% fuel for my OS65LA , its 10% nitro and 17% lube , I can't find out anywhere what the methanol content is.

.The book that came with my engine says not to use a fuel with less than 18% lubricant and to have 75 to 65% methanol and preferably 20 % castor .

The hobby guy told me I had the right fuel , whats the scoop ?
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Old Feb 17, 2012, 09:03 PM
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USA So. Cal.
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Everything that is not nitro or oil IS alcohol. So if you have 10% nitro and 17% lube (which is pretty standard fuel) then what is left is 73% methanol.
Nowhere does fuel advertise the alcohol content, only the nitro and sometimes the lube, but not always the lube percentages either. What you have is fine. Enjoy
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Old Feb 18, 2012, 07:24 AM
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Jacksonville Fla.
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Let me help you understand glow fuel......methanol is the fuel.....oil of course is the lube...oil not only lubes parts but carries away heat.....and nitro is an oxidizer that helps the burn...after all burning anything is the rapid oxidization of the fuel.....
So this means that the more nitro the hotter the burn...that is why 30% heli fuel has such a high oil content....I didn't say more power necessairly...I said a hotter burn......
The fuel you have is fine....everyone has been burning it for years
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Old Feb 18, 2012, 07:43 AM
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Thanks guys , that makes sense , now even though it says castor/synthetic will it have a tolerance for a lean burn ? I was told a synthetic doesn't tolerate a lean mixture as well as regular plain castor fuel , is this the best of both worlds ?

And what about OS wanting a minimum of 18% lube and up to 20 % could I add more castor since this fuel is only 17% .

I know real newbie questions

Just seems like the engine manufactures and fuel companies aren't getting together on this one .
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Old Feb 18, 2012, 10:28 AM
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Joined Dec 2009
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well lakefly!

I'm old school, from when synthetic was new and castor was the norm!

I wouldn't break-in any fourstroke unless it had 20% castor!

ok that being said, your OS LA engine is a great SPORT engine, and will do just fine on a blend! and that 1% 17 instead of 18% isn;t gonna hurt anything!

just be kind ta your new engine, and fly her 1/2 ta 3/4 throttle for atleast four tanks six even and that engine will last ya years!
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Old Feb 18, 2012, 12:24 PM
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Joined Sep 2004
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Nitro is not an oxidizer. It is a fuel that just requires less oxygen to burn.

You need 1.7 pounds of air per pound of nitromethane for complete combustion.

So, for the same amount of air in the cylinder, you can use more fuel, which produces more power.

Nitromethane does not burn hotter either. The reason heli fuel needs so much oil is that a heli engine is running at close to full power output all the time, the average load versus running time is much higher on the heli engine. And it only has the fan to blow air, not the larger prop plus the speed of the plane.
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Old Mar 04, 2012, 03:11 PM
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United States, GA, Thomasville
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Can you use one fuel that will perform well with 2 and 4 stoke engines?
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Old Mar 04, 2012, 09:20 PM
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I use the same 10% fuel in my 4 and 2s.
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Old Mar 07, 2012, 07:00 AM
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There's only a small handful of domestic fuel sellers who have product that actually meet (or exceed) ALL of OS's manual spec's for the LA engines -- Morgan is NOT one of those, nor is Byron or Wildcat.

Sig and Fox both sell higher oil content fuels with some castor that can meet OS's spec.

As a practical matter, you'll probably wind up taking whatever you can find locally and dosing a gallon with some added castor oil to bring it up to spec.

10% nitro is plenty for the LA series. They'll run perfectly well with 5% nitro or even 0% nitro. I have a carefully broken in LA .46 that's beast running 80/20 zero nitro FAI fuel I mix myself.
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