is there a site that will tell me how to modify my prop to get what I want out of it ??

Jim

If it's a wood prop you can trim the tips a little at a time and then rebalance. Been doing this for years. Customizing props is a trial and error thing, so be ready to buy a few in the process. I'm leery of mods being done to a C/F prop, tho.

There will be sites that tell you not to modify props, because when modified, you are on your own regarding risk insurance.
Having said that, wooden props are quite easy to modify. In any large wooden prop, there lurks that just perfect smaller prop. Unless you have an engineering education, do not make the mistake to remove material of, or near the hub, as this will seriously weaken the structure.

I have -for a looooong time used th next size up prop -then modified the blades to similiar of the size wanted.
Why?
rigidity

many cheap props -made in US had mismatched wood grain or depitched tips which frankly revved but did not pull well and or they flexed in operation.
But -there are now some very good import props (why in the hell do we always need import props to do the job right?)
Sh-t!
The new Bambulas, etc, made from beechwood are terrific props -tough , rigid -great performance .
Friend Ed Skorpa (ESComposites)has a line of props (imported) which are very similar to Mejzlic shapes These have the excellent clear straight grain characteristic I like.

yea, I bought a 3W 20-10 for my MVVS 35, hoping I wouldn't loose to much RPM over the unefficient Zinger 20-8 Pro, (Zinger really should rethink their name "Pro" for that hunk of wood), I got 7500 RPM with the Zinger, but once I get my carb back I think the 3W 20-10 will lower my RPM's more than I would like, so I will shorten it if needed,,,

I have seen guys shave the last 4,5,6 inches of their trailing edge for pulling power, my plane is a GeeBee Y and I want speed so I will be wanting to shorten my prop,,, can't wait to get my carb back !!

Jim

If you're looking for speed you might consider obtaining one of the higher pitched props. Something in the 14 plus pitch area.