Dillon Arms

The spin damping moment

 Spin damping moment

Abbreviations

cspin
 Spin damping moment coefficient; cspin(B,Ma.Re)
MS
 Spin damping moment

More Abbreviations

Explanation

Skin friction at the bullet's surface retards its spinning motion. The spin damping moment (also: roll damping moment) is given by the above formula.  The spin damping coefficient depends on bullet geometry and the flow type (laminar or turbulent).

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