Here are some images of Lindberg Models 1/87 scale Diesel Tugboat.
From Wikipedia"
A tugboat (tug) is a boat that maneuvers vessels by
pushing or towing them. Tugs move vessels that either should not move
themselves, such as ships in a crowded harbor or a narrow canal, or those that cannot move by themselves, such as barges, disabled ships, or oil platforms. Tugboats are powerful for their size and strongly built, and some are ocean-going. Some tugboats serve as icebreakers or salvage boats. Early tugboats had steam engines, but today have diesel engines. Many tugboats have firefighting monitors, allowing them to assist in firefighting, especially in harbors.
Tugboat engines typically produce 500 to 2,500 kW (~ 680 to 3,400 hp), but larger boats (used in deep waters) can have power ratings up to 20,000 kW (~ 27,200 hp) and usually have an extreme power:tonnage-ratio (normal cargo and passenger ships have a P:T-ratio (in kW:GRT)
of 0.35 to 1.20, whereas large tugs typically are 2.20 to 4.50 and
small harbour-tugs 4.0 to 9.5). The engines are often the same as those
used in railroad locomotives, but typically drive the propeller
mechanically instead of converting the engine output to power electric
motors, as is common for diesel-electric locomotives. For safety,
tugboats' engines often feature two of each critical part for
redundancy.
A tugboat's power is typically stated by its engine's horsepower and its overall bollard pull.
Tugboats are highly maneuverable, and various propulsion systems have
been developed to increase maneuverability and increase safety. The
earliest tugs were fitted with paddle wheels, but these were soon replaced by propeller-driven tugs. Kort nozzles
have been added to increase thrust per kW/hp. This was followed by the
nozzle-rudder, which omitted the need for a conventional rudder. The cycloidal propeller was developed prior to World War II
and was occasionally used in tugs because of its maneuverability. After
WWII it was also linked to safety due to the development of the Voith
Water Tractor, a tugboat configuration which could not be pulled over by
its tow. In the late 1950s, the Z-drive or (azimuth thruster) was developed. Although sometimes referred to as the Schottel system, many brands exist: Schottel, Z-Peller, Duckpeller, Thrustmaster, Ulstein, Wärtsilä, Berg Propulsion,
etc. These propulsion systems are used on tugboats designed for tasks
such as ship docking and marine construction. Conventional
propeller/rudder configurations are more efficient for port-to-port
towing.
The Kort nozzle is a sturdy cylindrical structure around a special
propeller having minimum clearance between the propeller blades and the
inner wall of the Kort nozzle. The thrust:power ratio is enhanced
because the water approaches the propeller in a linear configuration and
exits the nozzle the same way. The Kort nozzle is named after its
inventor, but many brands exist.
A recent Dutch innovation is the Carousel Tug, winner of the Maritime Innovation Award at the Dutch Maritime Innovation Awards Gala in 2006.
The Carousel Tug adds a pair of interlocking rings to the body of the
tug, the inner ring attached to the boat, with the outer ring attached
to the towed ship by winch or towing hook. Since the towing point
rotates freely, the tug is very difficult to capsize.
The Voith Schneider propeller
(VSP), also known as a cycloidal drive is a specialized marine
propulsion system. It is highly maneuverable, being able to change the
direction of its thrust almost instantaneously. It is widely used on
tugs and ferries.
From a circular plate, rotating around a vertical axis, a circular array of vertical blades (in the shape of hydrofoils)
protrude out of the bottom of the ship. Each blade can rotate itself
around a vertical axis. The internal gear changes the angle of attack of
the blades in sync with the rotation of the plate, so that each blade
can provide thrust in any direction, very similar to the collective
pitch control and cyclic in a helicopter.
6 comments:
This was one of the first model kits I built.
I love the "Lindberg Line."
This kit's been around a long time.
Fine job on the old Standard Oil tug. We do not know the true look of the original boat so we can generalize a stock facsimile of them. This was evidently a surplus WWII Army tug design sold as surplus. I did my rendition also of the Lindberg kit Despatch. It can be seen here also. Just another addition to tugboats.
http://forum.bristolcountyrc.org/viewtopic.php?f=19&t=229&sid=7a9e8dbc3cbb08a1e65e1ff30d6adcde
Enjoy.
Existen planos de ese remolcador
You have made a very model tug. When I worked the boats in the 1970-91 years there where still some old Army tugs converted for harbor towing hanging on earlier. Today they have more powerful tugs and newer powerful ship work Shottel tugs. Big change. Well done sir.
Thanks Neons!
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