Hi GSN, this is a strange aircraft, it is the Waco HKS-7, wingspan is 101" top wing and 87" on the bottom, It came from Norm Rosenstock plans through Vintage r/c, I think 1984, now that I am just about ready to test fly, I get worried about everything!, I will put a couple of washers behind the engine to give it some angled thrust before I go....thanks for the help...Bud..