My Thunder Tiger Stick, stock, with a Thunder Tiger Pro46, and Futaba radio was under 5 1/2 pounds for a wing loading of 17 oz/sq ft. The trainer was slightly less than that. My Balsa USA Stick 40+ with a Thunder Tiger GP42 has a wing loading of just under 20 oz/sq ft because of the smaller wing area. The Sig Citabria has a wing loading of 20.4 oz/sq ft. These are what my statement is based on. From my experience, most .40 size trainers should come out between 5 1/2 and 6 pounds dry.