OK. So, I stirred up something of a hornets nest when I made such an innocuous (spelling?) comment. I've been sitting on the fence a little although leaning towards the idea that motorcycle helmets, properly converted would probably be acceptable, maybe, maybe not. I'll no doubt get flamed for that but hey ho.
So for my next little firecracker:-
How about the fact that if a converted motorcycle helmet were cost effective enough to put it withtin the reach of more pilots, and lets face it most of us don't earn very much, then they would, or could, be worn by a greater percentage. Therefore the net safety margin were raised by a greater number wearing more protection that merely a headset.
Surely that, would mitigate the risk!? of potentially inferior protection of a certified design.
This debate is fascinating.