power output in kg•m/s =
= SQRT (4.9) * (weight in kilograms) * SQRT (distance jumped in meters)
power output in ft•lb/s =
= 4 * (weight in kilograms) * SQRT (distance jumped in feet)
where:
• SQRT indicates the square root function
1 watt =
= 9.80665 kg•m/s
= 1.35582 ft•lb/s
factor to convert kg•m/s to ft•lb/s: multiply by 7.233
factor to convert kg•m/s to horsepower: multiply by 0.0131
factor to convert ft•lb/s to horsepower: multiply by 0.0018
Note to Fox (1984):
• The conversion factor between kg•m/s and ft•lb/s given as 7.32, but the value given above can be derived from the units themselves or is given in tables (Weast, 1979).
• The units for distance jumped are not given, but meters and feet appear to agree with the nomogram.
• The metric equation seems to agree better with the nomogram.
Limitations (Harman et al, page 117):
• The formula does not use standard units.
• Gravity is not accounted for.
• It is unclear if the test measures peak or average power.
