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The bulkhead behind the rider including the head rest can take the place of a roll bar if it is sufficiently strong enough. The question is how strong does it need to be? The Insurance Institute for Highway Safety recommends that roof strenght be 4 times the static weight of the vehicle to be a top safety pick. So a 350 lb bike with a 250 lb rider weights a total of 600lbs and the bulkhead needs to support 2400 lbs. I want to bond some 0.350" aluminum honey comb panels to a 3/4" plywood core and see if will support my car ( '95 Geo Prism/ Toyota Corolla).
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