Dillon Arms

The Magnus moment

 Magnus moment formula
 

Abbreviations

cMp
 Magnus moment coefficient; cMp(B,Ma,Re,w,d)
eMM
 Unit vector
MM
 Magnus moment
 
 

More Abbreviations

Explanation

As the Magnus force applies at the CPM, which does not necessarily coincide with the CG, a Magnus moment MM (see figure Go to figure) is associated with that force. The location of the centre of pressure of the Magnus force depends on the flow field and can be located ahead or behind the CG. The Magnus moment  turns out to be very important for the dynamic stability of spin-stabilized bullets. For the Magnus moment, the above expression is used in exterior ballistics.

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