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 TM 5-1940-277-10
TM 1940-10/1
Section III. TECHNICAL PRINCIPLES OF OPERATION
1-12. PROPULSION SYSTEM
a. There are two 6-cylinder water cooled diesel engines available. The Sabre 5.95 liter is 363 cubic
inches with 212 horsepower. The Cummins 5.9 liter is 359 cubic inches with 210 horsepower. Engine
speed is adjusted by the throttle control mounted on the control console. Fuel is provided by an
external fuel system.
b.
Transmissions are 3-position, direct drive, hydraulically operated, oil-cooled units that transmit power
from each engine to its respective drive shaft.
c.
Drive-Neutral-Reverse position of each transmission is separately and mechanically adjusted by the
transmission selector lever located on the control panel.
d.
Drive Shafts transfer power from engine to hydrojet units.
e.
Hydrojet Units are hydrojet propulsion units that provide the thrust to move and steer the boat. Water
is drawn in through grilles in the underside of the boat and expelled through nozzles mounted beyond
the back of the boat. The force with the water is expelled depends on the speed of the engine.
f.
Scoops are movable metal shields that fit over the nozzles of the propulsion units and direct the flow
of water from the nozzle. The position of the scoops is mechanically adjusted by the steering wheel
and the scoop control levers mounted on the control panel. The steering wheel controls the port-
starboard directional movement of the boat The scoop control levers control the
forward-reverse motion of the boat. At low speeds, the scoop control can be used to turn the boat by
having one scoop in reverse position and the other in neutral or forward position.
Change 3
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