With the use of a wind tunnel the air friction force Fwon six speed skaters of different body builds was measured. The dependence of the drag coefficient CDon air velocity v and the influence of different skating postures on drag were investigated. At an air velocity of v = 12 m/sec, an angle between upper and lower leg of 110° and a horizontal trunk position, the measured air friction constant kn(= Fwv2) of all subjects was calculated from their height l and weight m according to the formula 0.0205 l3√m (standard error 2%). CDand as a consequence k appeared to be strongly dependent on air velocity. Expressions to correct k for other velocities and postures were derived and substituted into a power balance by which the influence of posture, ice condition, wind and altitude on performance was predicted. © 1982.
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