Hey s3nfo, We are putting the 180 on Zirioli B-25`s and will be using 18X8 bolly 3blade props. Our planes (4 of them) will weight in at app. 30# and the way the motor pulls on the test stand we may have been able to use 140`s. But whats a little extra power when you need it. Check out our
planes at www.skunkworks.rcplanet.com
Steve The Prez.