Hydraulic Motor Torque and Speed
Torque = psi x disp / (2 pi) x mech eff, speed = 231 x gpm / disp x vol eff, HP = T x rpm / 63025. 2000 psi, 2.0 in^3/rev, 10 GPM -> 573 in-lb, 1097 rpm, 9.98 HP; doubling displacement halves speed and doubles torque (same power). A sizing aid; the motor data govern.
Formula and source
torque = psi x disp / (2 pi) x mech_eff; rpm = 231 x gpm / disp x vol_eff; hp = torque x rpm / 63025.
The fluid-power motor torque/speed relations (torque = psi x disp / 2 pi, speed = 231 gpm / disp), by name.
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