Bill, I will probably do that if I get serious about using an electric. For the piston heli it don't make any difference. It can fly for an hour @ 20 m/s and uses right around an ounce of fuel per minute. It's virtually unlimited power for a 700 (105HZ O.S. in it).
The other thing is I am using timed exposures instead of distance based because I haven't figure out how to make my camera do distance based shots. It snaps a photo every 5 seconds and getting up to the proper target speed (which is ground speed) on a run is important to get the 100 meter coverage. The camera actually does 140 meters per shot, but you need the overlap when the imagery is processed.
I don't know what it would take to get an electric to fly that fast for that long. I can fly two sections (1,300 acres)/hr with turning time making 1 mile passes with the piston heli. I just have not come across an electric yet that can do it. A couple years ago I was using one of those little plastic DJI Phantom quads and that thing was (is) a joke compared to the helicopter. 20mph wind, that little cute white drone was all but done - it could barely move. The helicopter will hold right on 45 mph with a 20 mph headwind, no problem, and the engine just plays with it.