Breaking in K&B 6.5

[Daniel Hopkins]

I have this K@B 6.5 MIB which I want to use in my GYSOB. Any recommendations on breaking this engine in, fuel, prop size etcc
dlh98370

[Glenn Schneider]

Your K&B 6.5 is an ABC engine which should not need a traditional break-in. It should be squeeky tight at the top of the stroke. Use the fuel you intend to use flying it. The GYSOB used a 10/4 prop. If you haven’t read the article when it was published (July 1976 Model Builder) get a copy for tips on its adjustment, left thrust etc. right main wash in. That is a big airplane designed for long engine runs in the old days with 5 minute maxes. Still a great airplane. See if you can find a 7.5 (46) same case, to fly it in D. Good Luck, Thermals, Glenn Schneider

[Daniel Hopkins]

Thanks Glenn for the info,
dlh98370

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