  The friction felt by a speed skater is calculated as function of the velocity
and tilt angle of the skate. This calculation is an extension of the more
common theory of friction of upright skates. Not only in rounding a curve the
skate has to be tilted, but also in straightforward skating small tilt angles
occur, which turn out to be of noticeable influence on the friction. As for the
upright skate the friction remains fairly insensitive of the velocities
occurring in speed skating.
