The 'preferred' release is the one that looks like a tube with a cam centered in it - when the cam rotates, the line is released......  Hobby Lobby has one, John Derstine, Endless Mountain, has one.....
 
If your plane has enough room, go with at least a standard servo, but the correct design doesn't really generate much resistance.  Make sure to test on the ground under a good deal of line tension - you can always add a stronger servo if you have any doubts that it will release.
 
good luck!
Brent
 

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