91FX

[Nat Penton]

Randy I rarely check rpm but know I am turning in the 76 - 7800 range. Strong vertical, 8# airplane. 30% nitro, two shims. Choice of pipe can make a significant difference.

I  feel that I am losing little if any thrust horsepower with this setup. The larger props are more efficient and I am running lower tip speeds which further improves the efficiency, and it is quieter.

I must have a thousand flights on this piston and liner. Am pleasantly pleased they hold up so well. Also the SS sealed bearings are a blessing.
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