He means like I did that on MANY coasters you woud stay in the seat without a restraint when going through a loop. If it is going fast enough, the centrifugal force will keep you in the seat. Has anyone seen Tom Morrow 3.0 on disney channel? They talk about that really it's centrifugal forces that keep you from falling out.
Airtime hills and turns is different though.
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If you wanna dis me, then go knit a seater... or somethin' like that...