Hi all
After seeing the total loss of a NEW Engel Typhoon in 30ft of water (ouch must have lefta hole in the pocket) i created a simple and cheap failsafe system. All you do is get a small watertight canister (film canister or kinder egg canister) lock a piece of string in the caniser and create a loop. With a spare channel place a rod on a servo and then through the loop. then set the servo to a setting that will hold the loop in place but when you loose control the servo will (or should) go to the off setting. this pulls the rod from the loop and the canister will float to the surface. P.S canister must be outside the hull.

Sean