One of our club members converted a trainer to a glider tow plane, only he puts the plane on a mount on top of the tow plane, something like what they do with the Space Shuttle when transporting it from coast to coast. It looks pretty cool.

He has a rig set up with a servo that when he operates one of the switches on his transmitte, it operates the servo, which I believe is a landing gear servo, to release the plane. He takes off, climbs up to altitude then goes into a mile climb, releases and dives at the same time. The glider keeps going up as the tow plane goes down. Cool operation.

CGr.