Originally Posted by
Ruffinit
Old fart - I guess you could say it backfired. Scared the crap out of me. Didn't expect it to backfire at such a high rpm. It certainly did not seize and freely spun between compression strokes. I will be putting the 15 x 6 back on it. Like my grandfather used to say "If its not broke, don't fix it." Will test fly next weekend if weather permits.
The reason I wanted more performance, via 14x8 prop, is because the other GP P47 at the field has a DLE 20 w/15x6 prop and the top end performance is significant. Although performance is nice, I still would rather have the sound of my Saito w/ keleo exhaust over the DLE any day. Plus the 125 runs great. Many days I'm the only one at the field flying nitro. Everyone else has switched to gas.
Ruffy, if you plan on using that spinner nut and are worried about backfires throwing the prop, you can replace that washer with a thin nut between the prop and spinner nut. That will act as a lock-nut and prevent prop flying off.