Estimate crank horsepower from your quarter-mile trap speed and weight.
The speed at the end of the quarter mile, in mph (the most power-dependent number on a time slip).
Race weight including driver, in kg or lb.
Trap speed reflects power-to-weight well, so it gives a solid crank-HP estimate.
With the Hale formula: HP = weight_lb x (trap_mph / 234)^3. Trap speed depends mostly on power-to-weight and is far less affected by traction than the ET, which is why it gives a reliable horsepower estimate.
The 60-foot and ET are heavily affected by launch and traction; trap speed mainly reflects how much power moved the weight down the strip, so it is the better number for estimating engine output.
The Hale formula returns approximate crank/flywheel horsepower for a typical car. Real figures vary with aero and conditions, so treat it as an estimate.
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