HS6 piston-type engine
The aero piston-type engine is the machinery that applies the mixture of gasoline and air, burns in closed vessel (cylinder) and makes power in expansion. The piston-type engine must drive the screw propeller, which generates pushing (pulling) force and is suitable for middle and low flying middle and small-sized planes. In June, 1958, Zhuzhou Aero-Engine Factory succeeded in manufacturing nine-cylinder star cooling piston-type engine, which is applied for equipment delivery-5 plane and becomes the first aero-engine of new China. At present, it has manufactured over 4100 sets in accumulation and has the annual production capability of 200 sets. Piston 6K aero-engine is the latest model of piston 6 series and is applied as dynamic device of delivery 11 model and agriculture 5 model planes.
- Takeoff power: 294kw
- Rated Power: 276kw
- Takeoff oil consumption: 384g/(kw.h)
- Rated oil consumption: 343~377g/(kw.h)
- Mass: 210kg
- Outline dimension (L*W*H): 1046.5×996×996mm
In 1957, China started to design its primary trainer, the CJ-6. Initially, it was decided to use Czechoslovakia' s Doris-B piston engine as the powerplant. As the ordered engines could not be delivered in time, it was then decided to use our home-made M-11FR engine instead. As the two types of engines could not meet the need of the aeroplane, it was finally decided to adopt HS6 engines.
HS6 was a one row, radial, 9 cylinder, air cooled piston engine manufactured according to Russian AI-14R engine' s documents. It was light weight with a good performance and its take off power was 191 kW (260 hp) which equalled 163% of the M-11FR ' s. ZEF commenced production in August 1960. Soon after the Soviet government ended the contract. All the staff members and workers of the factory relied on their own efforts and worked harder, and constantly improved their skills. With the efforts in one year and 9 months, they achieved the success of the licence production of HS6 engines in June 1962. They produced about 700 engines in total.
The performance of the CJ-6 using the HS6 engine was greater than that of the CJ-5. Users of the aircraft gave it high praise, but during flight above 2,000 m it lost much of its height, reflecting an insufficient thrust of the engine at high altitude.
In order to improve the aeroplane's performance and expand the operation range for train¬ing, at the beginning of 1963, the factory started to carry out modification designs on the HS6 engine to increase its rated power. The modifications mainly involved the redesigns of some 12 components including the cylinder, crankshaft, and supercharger, in order to increase the compression ratio in the cylinder, increase the r.p.m. of the crank at rated condition and increase the gear ratio of the supercharger. The rated power increased from 162 kW (220 hp) to 199 kW (270 hp) and the take off power from 191 kW (260 hp) to 210 kW (285 hp), gaining 23% and 10% respectively. The 600 hour bench test was carried out in October 1963 and the expected results reached.
In 1964, a measure was undertaken by cutting the relief slot on the interface between the casing and the cylinder, that solved the major problem of the cracks on the intermediate casing. The substantial tests on the ground and in the air passed smoothly. In December 1965, it was approved for series production and designated as HS6A. The CJ-6 aeroplane with modified HS6A engine was much better: maximum level flight speed increased by 10 km, climb time reduced about 30%, service ceiling increased by more than 1,000 m and a substantial improvement in the height loss during vertical flight and aerobatics. HS6A .engine won the first class award for the national industrial products in 1964. Until 1986, some 3,000 engines were built.
In 1975, in order to meet the requirement for Y-11 aeroplane the factory further modified the engine and renamed it the HS6D. By increasing the r.p.m., and strengthening the reduction gears, the engine' s take off power increased to 220 kW (300 hp). In August 1980, the engine passed the ground test. It was a successful project.
The factory then further modified the engine as the HS6E. They modified or redesigned 36 parts such as the exhaust valve and reduction gears and further increased the compression ratio. The engine power was raised to 257 kW (350 hp) meaning it could now be installed on a new agriculture aeroplane. Prior to that, the factory developed the HS6B engine in 1966 to improve the high altitude performance by adding a turbo-supercharger. From 1963 to 1970, the factory successfully modified and designed the HS6C for light helicopters. It was then used on China' s "701" and "Yan ' an II " helicopters. The performance was good.
HS6 engine series are good quality, inexpensive, small piston engines modified by China. They have gained much praise for their applications to different aeroplanes.
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