Bob I am afraid I have bad news bud, there is not anything with a 72" wingspan or especially a 76" that is light enough to 3D with a Webra 120. If you want my opinion, the way to get out of your predicament the cheapest is get on ebay and sell that webra for around 200$ and spend 70 more bucks and get an O.S. 160 and then you can get any 72 in airplane you want and I guarantee you that the engine will allow for max 3D performance.