My gut says that the performance in a vehicle collision will probably bring the head to a halt against a relatively immobile object, so the hat won’t do much of anything as the crushable bits are crushed too fast to be effective.
I don’t see how the latter clause follows from the former. You said that in the drop test, the impact reduction was roughly 25%. This isn’t huge, but I can’t say it “won’t do much of anything.” Were you thinking of something else to support your claim?
No other source, but keep in mind that helmets are tuned for a certain force level. Too durable and helmet does not reduce peak force as it does not crush. Too weak and it crushes quickly, again with little reduction in peak force. This should just empasize to use the 25% number here though since the forces are more representative.
Redacting “won’t do much of anything” except as implied by 25%, but keep in mind that if peak accelerations are much higher than the given case, the helmet will be less effective due to the above. This may or may not be the case in car crashes depending on speed.
I don’t see how the latter clause follows from the former. You said that in the drop test, the impact reduction was roughly 25%. This isn’t huge, but I can’t say it “won’t do much of anything.” Were you thinking of something else to support your claim?
No other source, but keep in mind that helmets are tuned for a certain force level. Too durable and helmet does not reduce peak force as it does not crush. Too weak and it crushes quickly, again with little reduction in peak force. This should just empasize to use the 25% number here though since the forces are more representative.
Redacting “won’t do much of anything” except as implied by 25%, but keep in mind that if peak accelerations are much higher than the given case, the helmet will be less effective due to the above. This may or may not be the case in car crashes depending on speed.