ORIGINAL: bruce88123
I'm not saying the rule doesn't exist but I have not heard of it before. If anyone finds it in print, let us know. Provide sources.
The AMAspinner rule is in the competition rules, and not in general regulations as far as I can tell
http://www.modelaircraft.org/comp/05...ok/scale05.pdf
On page 163
2.4. All planes entered must have rounded prop spinners or some sort of safety cover on the end of the propeller shaft (such as a rounded “acorn nut’’).
It’s also on page 197, in the RC Combat section
http://www.modelaircraft.org/comp/05...k/rccombat.pdf