Radio-control source

Radio-control is now cheap. Thanks to fanatic model airplane enthusiasts, featherweight units are micro enough to fit almost anywhere, at a reasonable price. You can purchase the hi-tech guts for use in boats, bots, helicopters, cars, toys, and machinery. Or you can get off-the-shelf models. The chief source with the largest selection seems to be Hobby-Lobby. They specialize in all-electric (quiet) RC airplanes, but have the latest hi-tech batteries, servos, nano-radios, and parts. I’ve used them and their service is dependable. They publish a paper catalog, too.

— KK