Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

K&B 7.5DF engines

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Old 11-09-2009, 02:56 PM
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JeffH
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Default K&B 7.5DF engines

Is there any desire or want for these engines? I have one that I had on a whiplash and I have another that has been run, not by me, but doesnt look bad. The one I had on the whip was bought new by me and only run by me. I would say it has 30 runs on it. It probably needs bearings from sitting so long now. Any interest in these?
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Old 11-09-2009, 04:50 PM
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Default RE: K&B 7.5DF engines

i have one nib that i bought just to bench run. how does the one on the whiplash run?
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Old 11-09-2009, 07:29 PM
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JeffH
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Default RE: K&B 7.5DF engines

Mine runs great. Surprisingly, it idles well, and transitions instantly. I ran 5% nitro in the summer and 10 in the winter. I also run an extra head shim. I turned an 8x8 apc prop at 22500, backed off to 21500 for launch. It was very easy to run. I never even even blew a plug. When I had it my DF, I actually had it turning 24500 on the bench. It was screaming!!!!
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