MCDRAG · INTLIFT · McGyro · MCTRAJ

MCTRAJ

Point-mass small-arms trajectory calculator. PHP port of MCTRAJ.BAS (1987 / rev. 1993) using Heun integration and a Mach–Cd drag table.

Drag function

Name Mach, Cd table One pair per line: M, CD. Final negative Mach from the BASIC program is optional here.

0.00, 0.2629
0.05, 0.2558
0.10, 0.2487
0.15, 0.2413
0.20, 0.2344
0.25, 0.2278
0.30, 0.2214
0.35, 0.2155
0.40, 0.2104
0.45, 0.2061
0.50, 0.2032
0.55, 0.2020
0.60, 0.2034
0.70, 0.2165
0.725, 0.2230
0.75, 0.2313
0.775, 0.2417
0.80, 0.2546
0.825, 0.2706
0.85, 0.2901
0.875, 0.3136
0.90, 0.3415
0.925, 0.3734
0.95, 0.4084
0.975, 0.4448
1.0, 0.4805
1.025, 0.5136
1.05, 0.5427
1.075, 0.5677
1.10, 0.5883
1.125, 0.6053
1.15, 0.6191
1.20, 0.6393
1.25, 0.6518
1.30, 0.6589
1.35, 0.6621
1.40, 0.6625
1.45, 0.6607
1.50, 0.6573
1.55, 0.6528
1.60, 0.6474
1.65, 0.6413
1.70, 0.6347
1.75, 0.6280
1.80, 0.6210
1.85, 0.6141
1.90, 0.6072
1.95, 0.6003
2.00, 0.5939
2.05, 0.5876
2.10, 0.5818
2.15, 0.5762
2.20, 0.5707
2.25, 0.5654
2.30, 0.5602
2.35, 0.5553
2.40, 0.5505
2.45, 0.5459
2.50, 0.5415
2.60, 0.5330
2.70, 0.5249
2.80, 0.5171
2.90, 0.5095
3.00, 0.5023
3.10, 0.4953
3.20, 0.4885
3.30, 0.4820
3.40, 0.4757
3.50, 0.4696
3.60, 0.4638
3.70, 0.4583
3.80, 0.4531
3.90, 0.4481
4.00, 0.4433
4.20, 0.4344
4.40, 0.4262
4.60, 0.4186
4.80, 0.4115
5.00, 0.4049

Atmosphere & units

Range units Atmosphere Density ratio Air temperature (°F)

Projectile & fire-control inputs

Projectile identification Muzzle velocity (ft/s) Ballistic coefficient (lb/in²) Sight height above bore (in) Gun elevation (minutes) Print interval (yards) Terminate range (yards) Range wind (mph) Positive from gun toward target Crosswind (mph) Positive left to right Match range Rmatch (yards) 0 disables zeroing iteration Match height Hmatch (in)

Submit the form to integrate and print the table. Matching adjusts elevation when Rmatch ≠ 0.