The AI-14R, which underwent state trials in December 1950 and was used in many types of light aircraft. Several thousand were built. This Russian engine is the only radial engine still in production. There was also an AI-14V variant for helicopters and other applications. The AI-14R is typically used with a two-bladed propeller and is started with compressed air.
The engine has been developed over the years beginning life at 260 hp (194 kW) before reaching 400 hp (298 kW) in the current production M14PF, with a 450 hp (336 kW) engine under development.
The engine shown is the Polish built version powering the PZL 104 Wilga 35 four-seat utility aircraft first flown in 1962. Other versions of the engine are used in the Yak 12A utility aircraft; the Nanchang CJ-6, (engine built in China as the HS-6A) of 285 hp, (212 kW); the high-performance aerobatic Yakovlev 50 and 55, and the Sukhoi SU-31 400 hp, (298 kW).
The later geared engines are extremely lightweight for their power and feature a dry sump that ensures good lubrication even when inverted. Despite their power, they are very economical, using 40 litres per hour at cruising speed.
The AI-14RF was a variant uprated by Ivan Vedeneyev to 300 hp. Its further development is the Vedeneyev M14P family of engines.
Another modified version is the Czechoslovak Avia M462, which powers the Zlín Z 37 agricultural aircraft.
Photo source: Michał Deela