RE: Bell 47 Crash
He has been at IRCHA all week so bear with them, and his name is Dan.
1. It should be but gassers are prone to producing ignition noise and I would think a PCM reciever would be better, and a 2.4 better still. I also think that 2.4 isn't a substitute for proper radio installation and these kits have been around for a while before 2.4 was available.
I doubt over heating was the issue but you never know unless you do some temp testing.