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Old 05-23-2013, 04:34 PM   #126 (permalink)
Paintball Ballistician :P
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Join Date: Mar 2008

Originally Posted by -=ArchAngel=- View Post
... A lighter round with a faster speed may have its potential if its able to maintain most of it's initial speed during extended flight.
Only if it has a better ballistic coefficient. I've seen nothing that supports this being the case.

My Assumptions:
121 round has a Form Factor (nose and tail shape) equal to or worse than an FS round.
121 round has a weight worse than an FS round (this is a fact so far as published, and I believe I heard the rep at LL say 2.x grams)
121 round has a diameter approximately the same as an FS round (this is fact so far as published).

My Conclusion:
The round will definitely fly worse than an FS round.

Further Analysis:
Assuming that the Form Factor (i) of the 121 is the same as the FS round (.9070), the weight is 2.3grams, and the diameter is .685 (like an FS round):
Form Factor (i) = .9070
Weight in pounds (M): .0051
Square of Diameter in inches (A): .685^2 = .4692

SD = M/A
BC = SD/i

Solve for SD:
.0051/.4692 = .0109

Solve for BC:
.0109/.9070 = .0120
For comparison, here are other BC values:
.683, 3g paintball: .0057
SA 121 Round: .0120
First Strike Round: .0162

This is of course assuming that the form factor is not degraded by the forward shell lip, or the skirt shape/condition, and that the centes of gravity and pressure allow the round to be stable in flight.
FN303SD Totmacher 13 | SP 'Woodstalker' Ion | 1989 Line SI Bushmaster SI Deluxe
First Strike Round Field Listing | External Ballistics, FSRs and PBs | My Feedback
Originally Posted by Tom Kaye -in response to FS price critics
Unfortunately all of you have played the one "speedball" game of paintball for so long you can't conceive of other ways to do this and hence any new ideas seem stupid.
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