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Hall-Scott Defender marine petrol engine

Date: 1942
Overall: 1500 x 2600 x 1310 mm
Medium: Aluminium alloy, cast iron, bronze
Credit Line: ANMM Collection Gift from Philip Hammon
Classification:Vessels and fittings
Object Name: Engine
Object No: 00030596

User Terms

    This Hall-Scott Defender engine is a 12-cylinder V-form single acting naturally aspirated 4-stroke spark ignition low speed marine petrol engine. It is rated at 650 bhp (485 kw) complete with reduction gearbox and clutch.
    SignificanceThe Hall-Scott Defender engine conveys a sense of power and purpose and is a significant example of World War II technology.
    HistoryThis engine represents the ultimate development of the spark ignition engine as a form of motive power for smaller high speed naval craft in the Royal Australian Navy (RAN). Its position was usurped by the development of the first generation of the high speed diesel engine with an improved power to weight ratio.

    The Hall-Scott Defender engine was originally developed to power US Coastguard cutters to combat the powerful boats of Prohibition rum-runners. It was fitted as a standard unit to Fairmile B anti-submarine launches, 652 of which were built worldwide in World War II; 35 being built or assembled in Australia for the RAN in 1943-44. They were also fitted to 20 locally built Air Sea Rescue launches commissioned in both the RAN and the Royal Australian Air Force (RAAF). They also saw use as a power unit for the early motor torpedo boats (PT7 & PT8) of the US Navy.

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