King-Size Outboard: Schottel Redesign Classic NAV Propulsion Unit

By George Backwell at August 31, 2013 00:02
Filed Under: LPG, Methanol Fuel

The Schottel Navigator (NAV) has become a byword over the past 50 years for a reliable and compact propulsion unit suitable for use on an extremely diverse range of vessels including almost every kind of floating object, especially barges, ferries, working boats or floating cranes. In principle the NAV is a large scale mobile outboard plant, providing a vessel with 360 degrees steerable manoeuvrability. The manufacturers say they are soon to launch a new  generation of Navigators and the NAV 200 makes its debut at the upcoming Europort 2013 Technology Expo.

Grab dredger with 2 x Schottel NAV 110 (146 kW each): Photo courtesy of Schottel

For those who haven’t come across one, the NAV is an adaptation of the Schottel Rudderpropeller plus an engine and related equipment while the the unit’s base frame accommodates the daily fuel tank, which, for example, has a capacity of about 600 litres on the NAV 200. Installation is simple:  the Navigator merely has to be bolted onto a foundation prepared by the shipyard.

Modern and reduced-emission diesel engines from MAN or Caterpillar supply the input power to the propeller, ranging from 190 kW (NAV 0320) to 746 kW (NAV 550) and the switch cabinet includes electrical and electronic monitoring elements. The clutch between the prime mover and the Rudderpropeller transmits the power through a flexible coupling and a universal shaft which allows the propeller to be raised and lowered in a vertical direction and also pivoted to the rear.

Schottel explain that all NAV variants can also be supplied with a ducted propeller, and Rudderpropellers without nozzles are fitted with an anti- cavitation plate over the propeller to prevent air intake.

New Generation NAV Propulsion Unit Variants

New generation Schottel Navigator: Image courtesy of Schottel

The manufacturers also offer various product variants with the new generation of Navigators, all with a slimmer design: the NAV Basic, NAV Offshore and NAV Soundproof (the two latter versions can be combined) as follows:

The NAV Basic comprises the diesel engine, the exhaust gas system, the engine piping and cabling, and the daily fuel tank embedded in the base frame construction. Furthermore, this plant is protected by a steel sheet canopy painted to the customer’s specifications. The shipyard only has to provide the connections for fuel to the main tank, for electric connection to the bridge and for cooling water, if required.

For demanding offshore conditions the NAV Offshore is characterised by an enclosed version of the canopy with the frame, canopy and doors galvanised to prevent corrosion, and the upper part of the Rudderpropeller can also be protected by an additional cover. The interior is cooled by an extra ventilation system.

The sound-insulated version consists of an enclosed, insulated canopy, thereby reducing the level of air-borne noise to a mere of about 85 dB(A) at a distance of one metre. For special vessel applications reduction of the structure-borne noise may be necessary the manufacturers offer resilient mounting of the NAV and the thrust bearing.



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