Bill, Thanks for the prop information. Triming the wing TE to provide more prop clearance is already on my list. I have some structural plywood in that area to support the rear engine weight so I have hated to get in there and cut. Moving the engine back is a no for the moment. This plane has been extemely tail heavy from day one. However, I have managed to remove the 1/2 cubic inch of lead I had on the front engine mount. I have not settled on the best location of the CG. I now have it much further back than expected. My generous horizontal stabilizer apparently gives me a large range for the CG. I do want to end up with enough performance to do one engine takeoffs with either engine. I may trim the TE 1/4 inch and move the engine back 1/4 inch and hopefully get rid of the scream. I'm sure the scream translates into some prop performance loss. I used wooden props when I started in R/C in 1974. Thru the years I have become afraid of wooden props, somehow believing they may fly apart and hurt me. How do you feel about wooden props on R/C. My props touch the grass and ground frequently. The rear prop, though, is well protected from the ground. Only an inverted landing can touch it.