RE: Airfield 1400mm Spitfire battery compartment and CG
i would second on moving CG forward. i think Airfield's specified CGs are generally too far back. I had the 800mm Spit and it said to use 65mm for CG and the moment i took off, the tail dropped and the darn thing kept dropping one wing or the other and was outta control. i had to give more power and elevator down to try to keep it in the air and come around for a landing, but just couldn't hold it at one point because it was unpredictable and it went down. Then i moved CG to 45mm and it flew beautifully.
the new CG was at the top of the wing root curvature (not sure what the proper term is), so i'd imagine the big Spit would be the same location? so how are the flights, guys? i lost my 800mm Spit in a soy field and couldn't find it, and i think later someone found it for themselves. So i've been looking at its big brother for next season. the little one was absolutely awesome. i had enough motor on it to go unlimited vertical and its roll rate was just blazing. the frame was so sturdy and could take on all kinds of sharp pulls and yanking.