Schottel Gets Contracts For Six Tractor Tugs

Schottel of America, Inc. has announced the signing of two contracts with A s t i l l e r o s Unidos, S.A. of Mexico City (the government- owned shipbuilding group), for the design of six 22-meter Schottel Tractor Tugs, as well as the supply of the complete propulsion machinery p a c k a g e for these Schottel-propelled tugboats.

The design, based on the welldeveloped Schottel Tractor Tug, will be completed by Schottel England by Burness, Corlett and Partners (BCP), Basingstoke, who has had extensive experience in designing Tractor Tugs over the years. BCP has taken over the responsbility for the design of the vessels, including workshop drawings, installation drawings, piping and electrical diagrams.

The Tractor Tugs will be twinpropelled, and mounted in the bow section with two Schottel Rudder-Propellers, Model SRP 300/300DST, including a nozzle of 52 inches ID for higher thrust efficiency. They will be driven by General Motors Detroit Diesel Engines 16V-92, supplied by George Engine Company of Harvey, La.

Each will produce 600 hp per shaft, running at 1,800 rpm. The total reduction ratio within the Rudder-Propeller is 3.97:1.

"The Co-Pilot 2000" full-followup, electric hydraulic steering system will be employed giving the propeller/nozzle a steering speed of 21/. rpm. The advantage of using Rudder-Propellers lies in the fact that instant thrust is available in any desired direction through 360 degrees, and each Rudder-Propeller can be steered independently of each other. They will produce a total thrust of 16 tons, and the calculated speed of the vessel is 12 knots.

Astilleros Unidos will build these six vessels at its shipyard in Mexico. Upon completion, these vessels will be delivered to Pemex, t h e s t a t e - o w n e d oil company, where they will join two other Schottel-propelled Tractor Tugs of larger horsepower, operating since 1978 for mooring services off the coast of Mexico. The vessels are also equipped with a complete fire-fighting system, and are built under ABS Classification + A-1E +AMS.

Other stories from September 1980 issue


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