Okay, I hear you. Valid points, and while I don't think I'd be comfortable with a wood prop on a larger four stroke, I've used them with great success on the smaller ones (OS 48 Surpass).

Specifically, I'm looking to maximize the grunt of my YS 63 on 15% nitro. The lighter wood prop will put less of a load on the engine, allowing it to spool up faster, run faster, etc.

At least, that's what I'm thinking. The fact that it ran the best with a Top Flite 14x5 woody seems to vindicate that thinking. I finally found another 14x5 wood prop (Zinger), along with a 14x4. These will be tested next time I take the Somethin' Extra out.

But now that I've got the UCD flying, that could be a while...<G>