Hi folks, I have a top flite corsair 60-90 size that I would like to convert. At present, she has a DLE 20 under the cowl, swinging a 17x6 three blade prop. Does anyone know the formula to find out how many watts I need, or has anyone any experience with electrifing this particular plane. She weighs in at around 10 or 11 pounds, I think. Thanks in advance for any info. Steve.