What kind of remote control helicopters do you use? are there special license requirements?
for the most part as long as there is no law against flying RC aircraft there is no licesne needed to shoot areial photography from and RC helicopter. anything from a .30 size (aprox 40-50in rotor span) or larger can carry a decent camera and keep it stable. while being easy enough to see from the ground. i've been flying RC airplanes and helis for about 4 years now, and i've done a little areial photography with both airplanes and helis. they can be very expensive though 3k+ for some