Do you really beleave that a motorcycle or rally helmet would not work well in helicopter crash....Im not talking about bicycle helmet or skatebord helmet, a hat would do better
What I believe is not important - but as it happens - NO - I don't think a motorcycle would perform well enough in all types of helicopter crash, ( or for general use without crashing ) - compared with a helmet designed for helicopter use.
Of course if you stuff it up trying a run on landing onto tarmac, roll over, lose a window and end up with your skid lid dragging across the tarmac, it
might perform just as well - as this
might closely approximate a motorcycle crash.
But again - why risk it just to save a few bucks
The reference to bicycle and skateboard helmets is merely to demonstrate - as you appear to have agreed with - that cheaper isn't necessarily better.
I'll stick to a helmet designed for helicopter "use" thank you very much, and not just for the protection during a crash - which everyone hopes will never be put to the test