TFB STANDARD PROJECTILE

The Powley "Tangent Flat Base" projectile is very similar in shape to the usual short range bench rest type bullets, and most hunting bullets.

The program uses second order polynomial drag functions, which were fitted to the drag table data, to calculate the drag for a given velocity. Those functions are as follows:

drag_eqn.gif - 820 Bytes
DRAG FUNCTION TABLE a b c
V < 1100 ft/sec. 4.6264E-5 -5.7941E-4 -0.2605
1100 < V < 1200 3.6090E-3 -7.4873 3923.4
V > 1200 ft/sec. 0 0.21 -116
TFB-projectile