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For 7000 rpm 60/3500 = .017 sec. .017/6 = .00286 sec or 2.86 millsec. .00286 *1100 = 3.14 ft or 1/2 of that would be 1.5 ft or 18" for a runner length, at least if my math is correct. This is only an approximation but should give you an idea of lengths.

Hi Ed,

Was this a test to see if I was paying attention? Shouldn't this be 7000 rpm 60/2333= .026 sec ? Either way, these lengths seem mightly long for the cowl space I have.

Thanks for taking a look at this. I'm not sure what I'll do, but I also need to get rid of this #%&@ oil leak first. I made some progress on it, and hope I've got it beat now. Won't know how wrong I am until next time I fly.

Rusty (not kidding about the supercharger)