I have tried a small 12v relay on my dead man switch, and I am getting lots of interference! As soon as I press the throttle, the motor stops a few second later and I can hear the relay opening and closing a few times. The relay is connected to the ESC on/off switch. Anyone, having the same issue? My relay is powered by a SBEC (Turnigy Multistar Twin Output 5/10 Amp (6-50V) SBEC for Lipoly) and this SBEC is also powering the receiver.
Anyway, this was my first flight in freezing water. Luckily in dry suit and I have to say this is ADDICTING, a big thanks to Pacificmeister and Hiorth (I based my model on your v1)