Just another note. I could only put a 12x8 prop on with the short, flimsy stock landing gear (very easy to mangle). Do yourself a favor and order the Modeltech Sukhoi 40 landing gear (part no. 42019) from hobbypeople.net (like the one RCAddiction has in his pictures in another thread). They were on backorder but are now in stock (just received mine...nice). That will allow a 13x6 plus its stronger and cooler looking.