ORIGINAL: Mr Cox
The regular APC props can take 190krpm/diameter(inch), i.e. 19000 rpm for a 10'' prop: [link=http://www.apcprop.com/v/html/rpm_limits.html]APC safety limits[/link]
The drilled hole is a hit and miss on the APC but the casting from the back should be better.
I use a Top Flite balancer, and I've found that the two cones that center the prop on the balance shaft wont hold the prop tight. (The points on the cones touch before they hold the prop tight) So I've been turning one of the cones backwards (flat edge goes on the backside of the prop against the prop shaft hole) and pushing them tight. Once it balances, I flip it over and check it the other way. If it balances both ways, I call it good enough.
Is there an adapter I can get to balance these props better?