DECKMASTER
Table 2-3
MAXIMUM POWER AVAILABLE CONDITIONS
Theoretical Drive Train Analysis:
Electric Motor to Winch Drum
1.0
ELECTRIC MOTOR
30 Horsepower
1750 RPM
Efficiency = 0.91
2.0
HYDRAULIC PUMP
Sundstrand No. 20-2065-HDC
Rated Pressure
= 3000 PSI
Efficiency: Volumetric
h
V
0.95
Overall
h
OA
0.90
Flow @ 1750 RPM
= 14.6 GPM
= 3,373 in3 /min
SET System Pressure @ 3000 PSI
Power Consumed = (3000) (14.6)
(1714) (0.90)
= 28.4 Horsepower
3.0
HYDRAULIC MOTOR
TRW ROSS No. MAB-10-0-02-A1
Displacement 7.4 in3/Rev.
Torque = 118 in-lbs/100 PSI (theoretical)
Efficiency: Volumetric
h
V
0.95
Torque hT
0.87
Overall hOA
0.80
Assume 300 PSI system pressure drop
Output Torque = (3000-300) (1.18) (0.87)
= 2,771.8 in-lbs
Output Speed = (3373)(0.92)(7.4)
= 419 RPM
2-7
