An alternative suggestion for IFAN's Harbour/Yard tug requirement - purpose designed by the Naval Architects Robert Allen Pty Ltd for US Navy Service at Bremerton navy base, WA. note the set-back superstructure and wheelhouse to allow clearance under the hull flares of ships such as carriers and LHDs. USN also uses these tugs for docking submarines, and as such they are fitted with substantial amounts of underwater fendering.
Z-Tech 4500 Class Harbour Tug (YT-800 series classification - USN)
Length Overall - 27.42 metres (90'-0")
Beam, Moulded - 11.65 metres (38'-3")
Depth, Moulded - 5.00 metres (16'-5")
Maximum Draft (overall) - 4.88 metres (16'-0")
Machinery - CAT 3512 C DI TTA Main engines - Schottel model 1012 Z-Drives
Power - 2 x 1810 BHP at 1,600 rpm
Bollard Pull - 40 Short tons minimum
Free Running Speed - 12 knots minimum
Endurance - 7 days underway at 10 knots
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