Ian_Gere
Retired Moderator
- Apr 1, 2012
- 6,417
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- #61
Makes sense to me, UTJ. The lift generated by backspin results from friction dragging air from below, leaving negative pressure. Air blowing past ought to interact with the BB. I was going to say 'so long as the escaping air is travelling faster than the circumference of the BB', but actually that doesn't matter. If it is moving more slowly than the rotation (as I suspect) it would still add force to that angular momentum.
Crucial to understanding how BB's behave in the field though is to realise that the barrel is not still, so although the BB will have a tendency to ride the top of the barrel, if you move while firing (including minute involuntary twitches), the space around the BB will change position, relative to its centre, and that friction will begin to alter the direction of spin, relative to the trajectory. +1 for keeping stock still as a sniper...
Crucial to understanding how BB's behave in the field though is to realise that the barrel is not still, so although the BB will have a tendency to ride the top of the barrel, if you move while firing (including minute involuntary twitches), the space around the BB will change position, relative to its centre, and that friction will begin to alter the direction of spin, relative to the trajectory. +1 for keeping stock still as a sniper...