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What powerplant was proposed for the Braemar II?
Short answer
Four 400 hp (300 kW) Liberty L-12 engines, versus the four 230 hp Siddeley Pumas of the first prototype. With them the Mk.II reached 125 mph (201 km/h), almost 20 mph more than the Mk.I. The 360 hp Rolls-Royce Eagles intended for the bomber were not available.
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From the Puma to the Liberty
The first Braemar prototype flew on 13 August 1918 with four 230 hp (170 kW) Siddeley Pumas. The intended 360 hp Rolls-Royce Eagles were not available, and Barnwell was informed that Eagle engines would not be made available for the bomber. Overall, the prototype showed good performance, with a top speed of 106 mph (171 km/h).
Four 400 hp Liberty engines for the Mk.II
The Mk.II received considerably more power from its four 400 hp (300 kW) Liberty L-12 engines. With these, its top speed rose to 125 mph (201 km/h), almost 20 mph more than the Braemar Mk.I.
Production engines and the Tramp project
The BHP engine was among several powerplants with cast aluminium cylinder blocks that William Weir, 1st Viscount Weir, hoped would prove easier to mass-produce than the Rolls-Royce Eagle and Falcon, engines that only highly skilled workers could build. The Braemar's engine-room design was later revived, during the aircraft's development life, for the projected steam-powered Tramp. Two examples of that project were completed in 1921, and neither of them flew.
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