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A variation of the opposed-piston design is the free-piston engine, which was first patented in 1934. Free piston engines have no crankshaft, and the pistons are returned after each firing stroke by compression and expansion of air in a separate cylinder. Early applications were for use as an air compressor or as a gas generator for a gas turbine.
Fairbanks Morse Opposed Piston liner and water jacket. The 38 8-1/8 engines are inline diesel engines, with combustion occurring between two opposed pistons within a single cylinder liner. The engine has a bore of 8-1/8 inches (206.4 mm), a stroke of 10 inches (254.0 mm) for each piston, and the cylinder height is 38 inches (970 mm).
The exhaust valves have stellite faces and the connecting rods have a 0.125 in (3 mm) hole drilled in the rod cap to improve lubrication. The pistons have three rings and smaller piston pins. [1] [2] A75-1 A75-2 A75-3 A75-4 A75-5 A75-6 A75-14 A80 80 hp (60 kW), Compression ratio 7.55:1, max rpm 2,700, fuel consumption at cruise 5.2 US gph.
Toggle Specifications (GSO-526) subsection. 2.1 General characteristics. ... 6-cylinder air-cooled horizontally opposed aircraft piston engine; Bore: 5.125 in (130.2 mm)
The Dair 100 engine is a twin-cylinder two-stroke, opposed-piston, 1,810 cc (110.5 cu in) displacement, liquid-cooled, diesel engine direct drive design. It produces 100 hp (75 kW) at 2500 rpm, with a compression ratio of 18:1. [1]
The Lycoming IO-720 engine is a large displacement, horizontally opposed, eight-cylinder aircraft engine featuring four cylinders per side, manufactured by Lycoming Engines. [ 1 ] There is no carbureted version of the engine, which would have been designated O-720 and therefore the base model is the IO-720.
It has two ported cylinders with a crankshaft at each end and four pistons in total. This engine is similar to the prototype Diesel Air engine, which was built for Diesel Air [3] by Weslake, but which has to date failed to reach volume production. Each crankshaft is linked by an idler gear to a centre shaft. [4]
[2] Vultee XA-19A with Lycoming O-1230 installed. The same year the USAAC became interested in the O-1230, and began supporting the engine development program. In 1936, the single-cylinder development tests exceeded expectations, passing its 50-hour test requirement. The full-size engine was ready for testing in 1937, and was rated at 1,000 hp.