Well it is not going to draw 50 amps if it is a 450 size heli, depending on the motor it can be 25~35 amps when first starting up. I was just suggesting 50Amps because you never want to run a power supply at full power. Realisticly the motor only draws 10to20Amps while running. If you plan on running your heli with a remote power source be carefull not to burn up your ESC or Motor because of the infinite run time ability. Heat is electronics worst enemy, I was thinking last night about maybe replacing an ESC's heatsink with the heatsink from a CPU because that could take the place of the wieght of a battery and also save your ESC from turning into charcoal. I have never tried it, that was just a thought but I am sure that I will try it when I can.