Bryon-

The power consumed by a receiver and servos is ~ 0.125 amps/hour. I only worry about consumption with my electric powered glider....if it's up for a looong time, I blip the throttle...if it spins the motor, I've got juice for the radio. For all other planes, if I've not enough juice to spin the motor (yes, when power reaches some arbitrary number, the motor will cut out, but you still have plenty of battery power left to glide in), then I set up for landing.

FWIW, the power consumed by the radio is typically margin when compared to the consumption of the motor; you really don't need to account for radio consumption when you desire to estimate running time.

What type of plane are you referring to?


Paul