I just read the 2005 Buyer's Guide for Model Airplane News, there was a review for the Groovy 3D, reviewer says (taken with a large pinch of salt as with almost all reviews) that the plane was about 5.3 lbs only. Says would have loved a bit more power to pull out of a hover ... he used a 46AX. Maybe you can put off the purchase of the engine tillyou build the plane and loaded the electronics in. Then see what the weight will be. If its really 5.3 lbs you can go with a simple TT46 even.