TM 55-1930-209-14&P-17
c.
For long distance or long periods of operation, cruising maximum speed is about 200 rpm below maximum
attainable rpm. Set throttle for maximum power and allow boat to reach its maximum rpm. Then, reduce rpms to
200 below the maximum rpm.
NOTE
Depending on load and sea conditions, normal cruising should range
between about 2600 rpm (where boat may fall off plane) and a maximum
cruise of about 3300 rpm. These parameters, based on use of a 16 inch
diameter propeller with 19 inch pitch, may change when a different
propeller is fitted.
d.
Monitor engine instruments for proper readings. Coolant temperature should be 165 to 195F. Make sure cooling
water is flowing overboard.
e.
Adjust outboard drive by using power trim switch to maintain best running conditions. This will show on the trim
gauge within the TRIM range.
f.
When running in shallow water or water of unknown depth, adjust outboard drive into BEACH range. Reduce
engine speed to very low or idle speed; push IN button on trim control on dash and push toggle switch UP to
adjust drive as indicated on trim gauge. This must be done ONLY when engine is at low speed or idle. Once in
BEACH range, engage either forward or reverse and increase speed. With this setting, propeller will not develop
as much thrust.
CAUTIONS
Never shift to reverse when boat is planing.
If accidentally running in very shallow water, shift engine to neutral and
raise outboard drive to full TILT position to preclude damage to drive.
Power can not be applied to drive while in TILT position.
NOTE
Reverse can be engaged while in TRIM or BEACH range of the trim plane gauge.
2-14 Emergency procedures
2-14.1 General. The two most dangerous situations for small boats are to have a fire onboard or accidentally run
aground under power. This assumes that good judgment and knowledge of weather and sea conditions would preclude
being capsized or swamped in heavy seas.
2-14.2 Fire prevention. The best firefighting technique on the workboat is to prevent a fire from starting. This requires
strict compliance with preventive measures such as:
a.
Keep engine compartments clean and free of debris, rags, oil and fuel spills.
b.
Keep bilges clean and pumped out.
c.
Clean any fuel oil or lubricating oil spills immediately.
d.
No smoking in cabin.
e.
Keep fuel lines and filters tight to preclude seepage and leaks.
2-14.3 Firefighting techniques
a.
Send a distress signal via radio, flares, or horn.
b.
Make sure all persons onboard are wearing their lifevests.
c.
Since wind created by boat's movement may fan the fire or blow away firefighting chemicals, bring boat to a
standstill if sea conditions permit.
2-20
