On Apr 17, 2:59 pm, "Capt. Geoffrey Thorpe" The Sea Hawk @See My
Sig.com wrote:

Removing weight from the tip will change the blades natural resonant
frequencies.

The less metal you remove, the less you are going to change them, but do
you know how much room you have between the engine firing order frequencies
and the current resonant frequencies of the prop?

I see a fair amount of risk for not much (if any) gain.

Every certified prop has a Type Certificate Data Sheet, and that sheet
will specify maximum and minimum diameters for particular engines. The
info is there so it's not necessary to go kill oneself learning it all
over again. Here's the TCDS, for example, for the McCauley 1C160 prop
used on many 172s:
http://www.airweb.faa.gov/Regulatory_and_Guidance_Library%5CrgMakeModel.nsf/0/A2153BC309BE73C0862571A800643E15/$FILE/P-910.pdf

For instance, it says that for a Lyc O-320, 150 hp @ 2700 RPM, the max
is 75" and the min is 74".

So you would go he http://www.airweb.faa.gov/Regulatory...e?OpenFrameSet

and look up your Hartzell model and see for yourself.

Dan