im_a_rcav8r:

The spiraling of the slip stream does indeed affect the handling of the airplane.

I'm intending to include that consideration in the installment on thrust lines.

You are invited to visit the second installment here:

http://www.rcuniverse.com/showthread...93&forumid=220

P-factor is the first in what I plan to be a series to qualify every body to be a scratch builder. The link takes you to number two.

Share your thoughts.

Thanks.

Bill..