Yacht Engines
Yacht Engines
Yacht Engines
A yacht is a pleasure boat and is
used for commercial tourism or for private purposes.
Yachts are designed for cruising in marinas, inland
waters, and areas close to the coast. It is generally
not designed to face the ravages of the ocean.
For the yachts to cruise around it needs engines
for propulsion. The propulsion engines are usually diesel
engines and are mounted on both side of the keel, on
the port and starboard sides. There are many makes of
yacht diesel engines in service, to name a few, they
are Mercury, M.D.U., Caterpillar, MAN, Volvo Penta,
Hyundai.
Yacht engines are four stroke engines, i.e. it requires
four strokes to complete one cycle resulting in two
crank revolutions. The piston has two strokes down wards
and two strokes upwards, i.e. the reciprocator motion
of the piston is converted to rotary motion at the crank
(crankshaft). A rotary motion is transmitted to the
gear box and through the propeller shaft the rotary
motion is further transmitted to the propeller.
Yacht engine speed ranges vary from medium to high
speed. The medium speed engines range is from 300 -
800 revolutions per minute (RPM) and high-speed engines
range from 800 -2,000 RPM. A reduction gear is engaged
to reduce the engine RPM to an acceptable limit at the
propeller. Propellers are generally more efficient at
lower RPM. By and large, the reduction gear is fitted
aft of the yacht engine but in some cases, it is fitted
forward of the yacht engine. The reduction gear enables
to reduce the RPM of the engine to suit the propeller.
Yacht diesel engines come in two configurations,
i.e. in line or I engine and VEE or V engine. In an
I engine the piston moves upwards and downwards in vertical
direction. However, in a V engine the configuration
the pistons is in angular direction and it moves in
an upwards and downwards. . The number of units varies
from 3 cylinders to generally 12 cylinders. Typically
there are two yacht diesel engines, one on the port
side and the other on the starboard side, thus there
are two propellers. The horsepower of the engines varies
from 200 per engine to 1,000 per engine.
To boost the power of a Yacht engines are turbocharged.
Blowers are provided to supply air to the turbochargers.
I engines have 1 blower whereas in V engines there are
2 blowers fitted
The engines are designed to provide optimum speed
to the yacht. The smaller yachts- 30 feet length has
higher cruising speeds as compared to 140 feet yacht.
Depending on the design, the top speed of a small yacht
is generally around 40 knots. And the cruising speed
of around 30 knots. However, the top speed of a big
yacht is around 22 knots with a cruising speed of around
15 knots.
Constellation Marine Surveyors have 20+ years of
average experience in yacht inspections, pre-purchase
surveys and overall condition surveys. We are available
24X7.
By: Engr. Ramesh Krishnan
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