Chuck, Jmulder,

The RPM limits on props depends on their producer:

Master Airscrew limit their prop RPM to 166,000/diameter in inches
(a 10" prop is limited to 16,600 RPM...).

Bolly limit their Clubman series props to a calculated tip speed of 475 MPH (do your own math... 15,234 RPM for a 10.5" prop).

APC limit their props to 0.75 Mach tip speed, 190,000/diameter in inches (a 10" prop is limited to 19,000 RPM...).

Even when fitted with a Jett-Stream muffler, on 15% nitro, the 46FX could only manage 15,900 ((c) www.jettengineering.com).
The borderline for Bolly is offset by the fact that their props are all +.5", so you will not use their 10" size, only 10.5", or 9.5", the later with complete safety as its limit is higher.

I have never seen a blade thrown off a previously sound prop, by any engine. It is the prop manufacturer's insurer speaking here.

For those of us who keep on using crashed and badly nicked and mangled props; this is fair warning. A thrown blade can kill, or cause serious injury.

Sincerely,