Hello ANZAC, If your amp numbers are correct, you should be able to produce about 1100-1200 watts on your DC-3 on a fully charged battery. That would put you over 100 watts/ lb. Plenty of power for your plane. I would suggess you use a 30c or higher battery. You might want to experiment with a different size prop. Try a 12x9 3 blade and check youramp draw and thrust.