General arrangement and planning
30
Engine centre distance,
twin installation
For twin installations, consideration must be given to
the minimum distance between the engines to allow
sufficient accessibility for service work. Larger dis-
tance also gives better manoeuvring capacities.
Check for a suitable distance by using the dimension-
al drawing.
Generally, the following minimum measurements be-
tween the engine’s centre-lines (A) are recommended:
TAMD engines 850 mm (33.5")
KAMD engines 950 mm (37.4")
A
Weight distribution
General
It is of major importance for the top speed running atti-
tude etc. to locate the LCG properly. Generally a boat
with high top speed should have the LCG more aft
than a slower boat.
The centre of gravity has a major influence on the
boat’s static and dynamic stability. It is therefore im-
portant to consider this for the both when loaded and
unloaded.
Planing and semi-planing hulls
For planing and semi-planing hulls especially it is im-
portant that heavy equipment such as engines, fuel
tanks, water tanks and batteries are positioned in a
way as to obtain the best possible trim of the boat in
the water.
Fuel and water tanks should be located as close to
the LCG as possible to keep the LCG steady even
with different levels of fuel and water.
It is an advantage to install the fuel tanks away from
the warm engine room. The batteries should be placed
in a separate, well ventilated area if possible.
Figure B
LCG = Longitudinal Centre of Gravity
LCG
LCG
Figure A
Figure A represents an installation with good weight
distribution and with a good trim angle.
Figure B represents a wrong type of installation with a
subsequent bad running attitude.
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