RC Fuels Nitromethane, Castor Oil, Synthetic, heli fuel, 4 stroke, etc...Fuel Q&A is here!

FAI Fuel question

Old 11-05-2018, 01:36 PM
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Default FAI Fuel question

I have a Great Planes Stearman with a Gemini 120 4 Stroke engine. I picked up a gallon of FAI fuel. My question is can you use it in the Gemini or stick with the nitro fuel?
Old 11-05-2018, 06:24 PM
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The OS user's manual recommends fuel containing 5% to 15% nitromethane. I think your engine will run on FAI, and probably quite well. The needles may be more difficult to adjust than with fuel containing some nitromethane. If by FAI you mean fuel containing 20% castor, the castor may be a bigger problem than the lack of nitromethane. The castor will gum up the engine over time. Fuel containing mostly synthetic might be a better choice.

By the way, nice engine!

Last edited by JPMacG; 11-05-2018 at 06:26 PM.

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