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Thread: O.F 25 F


  1. #1
    James c harrell's Avatar
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    O.F 25 F

    I recently bought a bunch of RC parts from a guy who was selling out and found a brand new in the box O.S. 25F ABC. I was wondering about the type of fuel to use and how it would compare power wise to the modern 25s'. The only instructions that I have with it are for the 2b, 2ca,2cb,2cb-d,etc. "automatic carburettors"
    '

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    RE: O.F 25 F

    It's equal to most modern .25's, the design is very much the same. The engine is an ABN design though, don't be fooled by the ABC designation and use 22% CASTOR OIL
    \"Keep it clean and not too lean\" Duke Fox

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    James c harrell's Avatar
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    RE: O.F 25 F

    What is abn? And I usually use Bryons 15 % nitro and 18% oil but I think they use a synthetic/castor blend.

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    RE: O.F 25 F

    ABN = High silicon Aluminum piston running in a Nickle plated brass liner. Not as durable as a high silicon aluminum piston running in a chromed brass liner.
    \"Keep it clean and not too lean\" Duke Fox

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    James c harrell's Avatar
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    RE: O.F 25 F

    Will the 15/18 Bryons be O.K.? I ran it today on my Combat and she runs great. Better than any of my newer 25s'. Swings a 9-5 great. I never lean it out all the way and I probably won't. My combat plane pulls alot of Gs' and will cut most of my engines back if leaned out to the max. I run them all rich and deal with the clean up. I got a kick out of the carb instructions when they called the carb an "automatic" because it wasn't an air bleed.

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    RE: O.F 25 F

    18% oil content would the the minimum. You should also have a significant part of the oil mix be castor oil. Non-ringed engines like castor as a major part of the oil mix.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007
    Email: hobbyservices@hobbico.com


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