My BT60 slight upscale (1.24X) is only 2 ounces so I am getting a little concerned about loosing another one on a D12-5 or 7. These things are awesome fliers. My daughters Screamin Mimi runs around 4.5 ounces and does nicely (not too high or low) on a D12-3. Now I am thinking about getting some C11s so I dont loose it on the maiden flight. That SW Gremlin looks like a fast higher flyer too!