Thanks for the great replies guys.

i have a ripmax trainer and currently power it with a thunder tiger 46 pro so it has plenty of go. Could i fabricate a cradle for this with some sort of servo release?

i fly on grass but I'm thinking ill need Tarmac for a piggy back take off.

ive not got loads of experience as the title of my thread would indicate but I can fly my trainer easily and smoothly. I'm currently fixing the front wheel on my Pilautus pc9 which I bashed onto the nose wheel on landing. It probably would of been okay but the previous owner has done away with the steering and has made a bad job of fitting a fixed wheel so any force was channeled into the plywood covering which it carved through.

anyway I think I can competently attempt a piggy back so my new challenge is to do so. The glider is my friends and is around 9 feet wing span. Ill need to fix it as my friend tried hand launching it (unpowered) to see if he could fly it. We now know you need hills, launch or thermals and that even the most enthusiastic of throws won't get a 3m glider flying. Anyway he threw, it stalled and crashed, snapping the fuse behind the wings. It snapped the wooden control linkages too. Ill try fixing them all without taking it apart if I can.

Watch this space for glider piggy back action.