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Old Aug 29, 2012, 12:16 PM
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earlwb's Avatar
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Yes you can, no problem, just add some more castor oil to the fuel. People do it all the time too.
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Old Aug 29, 2012, 01:47 PM
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How much per gallon?
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Old Aug 29, 2012, 02:48 PM
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Birmingham, Alabama
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i use to use 11*4's on some funfly planes. keeps the speed more even than the typical 11*5/6 and much quicker throttle response than 12*4's.
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Old Aug 29, 2012, 07:55 PM
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I think you will need about 5 oz to the gallon.
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Old Aug 31, 2012, 06:43 AM
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I think you will need exactly 8 ounces of castor.

You have 128 oz of 15% oil fuel, therefore 108.8 oz of methanol and nitro (128x .85)

To get 20% oil fuel that 108.8 needs to be 80% of the total so 108.8/.8 gives 136 oz total. 136-128 gives 8 oz castor to be added to the gallon.

If you add just 5 oz you will get fuel with around 18% oil, which is probably close enough.

Hope this helps.

Dave H
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Old Aug 31, 2012, 07:38 PM
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Thats right, looking back I now realize I used 6oz to my 16% oil fuel to bring it up to something useful , my memory is shot.
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