Outdoors, aviation, and archery calculators

Front-of-center is the AMO measurement: how far the balance point sits ahead of the shaft’s midpoint, as a percent of shaft length. Kinetic energy uses Easton’s identity, grain weight times speed squared divided by 450,240. The speed estimate scales from the IBO test condition, 70 pounds, 30 inches, 350 grains. A chronograph still wins.

Crosswind is wind speed times the sine of the angle between the wind and the runway heading. Headwind is the cosine. Runway 27 is heading 270. Wind is the direction it comes from.

The ballistic calculator is a flat-fire point-mass model with BRL G1 and G7 drag. It reports drop, drift, velocity, and energy. It does not model spin drift, and it does not give a powder charge or a reloading recipe. Energy at one velocity, with no trajectory, is the bullet energy calculator beside it.