The ratio of the cosines of the blade angles at the outlet and inlet can be taken and denoted . The ratio of steam velocities relative to the rotor speed at the outlet to the inlet of the blade is defined by the friction coefficient .
the ratio of the cosines of the blade angles at the outlet and inlet can be taken and denoted  the ratio of steam velocities relative to the rotor speed at the outlet to the inlet of the blade is defined by the friction coefficient 