John Fox Jennens Malone: The Liquid Stirling Engine and Its Comparison with Other Heat Engines

The Malone engine is a liquid-based engine invented by J.F.J Malone of Newcastle, England.[1][2] The engine used high temperature water as its working fluid, and was therefore also referred to as the Hot Water Engine. A US patent, describing it with Mercury or an Mercury-Lead Alloy as working fluid, for the engine was granted in 1924,[2]Malone's first 50 hp prototype was completed in 1925, and used coal to heat high pressure water sealed inside a cylinder. Malone's second prototype, demonstrated in 1931, also produced 50 hp but in a much smaller design.[3]

John Fox Jennens Malone : The Liquid Stirling Engine

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The basic principle of Malone's engines were very similar to those of Stirling Engines, except that Malone used a liquid as the working fluid, rather than air. Having tried many liquids he finally settled at water, at very high temperature and pressure resulting in them providing very econmical power. Plus, as they did not require larger boilers, their footprint was small, making them ideal for use in ships. 2ff7e9595c