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Thread: 180 ELDM Blowing up

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  1. 20-09-2020, 09:19 AM #1
    Micky Duck
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    actually realised my maths is wrong...going from 1;12 to a 1;8 is a 50% increase in spin...3 turns in 24" Vs 2 in 24" so will be 180,000 x1.5= 270,000rpm
    so its like going from 3000fps to 4500fps in the forces /strain its putting on projectile....
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  2. 20-09-2020, 09:54 AM #2
    zimmer
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    Quote Originally Posted by Micky Duck View Post
    actually realised my maths is wrong...going from 1;12 to a 1;8 is a 50% increase in spin...3 turns in 24" Vs 2 in 24" so will be 180,000 x1.5= 270,000rpm
    so its like going from 3000fps to 4500fps in the forces /strain its putting on projectile....
    Yep MD, correct.

    Easy formula is MV X 720/Twist Rate = RPM
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