Other factors aside, at the end of a flight for glow, you refuel, start your engine and off you go. For electric, you need to pull the wing off or a battery hatch and either replace the batteries or plug in a charger and wait 45 minutes to an hour before you can fly again. An instructor might have other new flyers waiting and not have the time to wait for your batterys to charge back up. Considering that 6 flights is considered a basic days flying then you would need 6 fully charged packs to last the day if you want to replace the packs instead of waiting for a recharge. 6 packs that are large enough to rival a 40 size glow engine in power is very expensive. At the end of the day you would have to recharge all your packs as well as your transmitter pack. Does E power still sound like the way to go?!?[8D]