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Windxtasy said..
When I do crash my major problem is whiplash type injury.
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I have been hit on the head by the mast a few times and half of those would be on the nose/chin which is not going to be protected by the helmet.
I'll second this. Only time I've really hit my noggin' was in the surf. Attempting a sort of attempt at an attempted back-hand off-the-lip, poorly.
Anyway I got thrown forward into my mast. Hard. There was a second or two where I though"Oh No" and I was waiting to black out and die. But nothing happened. I was quite surprised. I hit a bit above my forehead where skull it a bit thicker.
I think being cracked across the jaw is going to knock you out quicker than being hit on the head. And helmets can't help you there.
The whiplash risk added by the helmet also concerns me. I am more likely to get catapulted than anything else.
I am considering a helmet for 25 knots +, but the whiplash thing, especially at speed, honestly concerns me more than hitting the mast with my head.