Original TwinProp Bow and
Stern
Thrusters
Octane Series of Bow and Stern
Thrusters
Advantages of a smaller tunnel
diameter
...or why small is BIG
Problems of Hydraulic Motors in the
Water
Gearbox Re-Installation Procedure
Our Original TwinProp
Thrusters have demonstrated for over 24 years that, using smaller tunnels, they could
deliver the same or greater power and thrust as competitors' systems. These thrusters are
thoroughly field tested and have shown that larger tunnel diameters are often unnecessary.
Our 8 inch 50HP TwinProp thruster has been successful on vessels to 100 ft, and our 6
inch 25HP thruster has been successful on vessels to 50 ft. Twin tunnel
configurations of our 8 inch and 6 inch systems have been used successfully on vessels to
130 ft, and 105 ft, respectively.
FEATURES
HIGH OUTPUT FOR A GIVEN SIZE TUNNEL.
As compared with any thruster in the world, significantly smaller tunnel size for the same
power rating.
2. The Shipwrights gearbox, has a very high power rating for its size, is a
low-profile, flowstream friendly design, and can be powered by a variety of sources. It
allows a hydraulic motor to be fully contained in the hull, guarding against both seawater
contamination of the hydraulic system and oil contamination of seawater. See :
Hydraulic Motors in the Water.
3. All materials in contact with seawater are of 316L, Aquamet 22, 17-4-PH & NIBRAL,
four of the most corrosion resistant materials available.
4. A special tunnel interface allows for simple removal of the thruster while the
boat is in the water greatly reducing the time needed to remove the thruster
from the tunnel and reducing maintenance and hauling costs. This proprietary
tunnel interface also provides an exceptional amount of stiffness and
strength to the tunnel/thruster assembly.
5. Dual NIBRAL propellers are designed to produce equal thrust in both directions. NIBRAL
(Nickel-Aluminum-Bronze) is both strong and very resistant to corrosion.
6. Custom designed Stator Screens enhance flow linearity, swimmer safety, and protection
against gearbox damage from debris. They are designed to increase flow efficiency
(by converting rotational energy into linear thrust).
7. Sacrificial zinc anodes provide protection against electrolytic corrosion.
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