Kizlyar Electromechanical Plant (KEMZ JSC), a Russian aerospace manufacturer specializing in helicopter and aviation equipment development, has announced the successful completion of the first hover test of its new AP-55 five-seat coaxial rotor helicopter.
According to KEMZ’s press office, “The tests proceeded as planned, with all systems operating nominally. The helicopter demonstrated stable handling and predictable flight characteristics during the hover. The results of this phase confirm the viability of the technical solutions implemented in the project. The flight test program will be expanded according to the approved schedule.”
The AP-55 is powered by a foreign-made Rolls-Royce Model 250-C20 turboshaft engine, rated at approximately 450 shp. The use of this imported engine enables the collection of essential flight data and supports ongoing project development. However, for certification and serial production, the use of this engine is not permitted under Russian regulations. The manufacturer plans to replace it with a domestically produced turboshaft engine, which will ensure production independence and sustainable project growth. The specific Russian engine model has not yet been officially announced.
Development of the AP-55 began in 2020 as a joint project between AVIA-PROEKT JSC and KEMZ JSC. The design is intended for operation in a wide range of climatic conditions. The AP-55 targets both the Russian civil market and export customers, and is suitable for passenger and cargo transport, patrol missions, search and rescue operations, pilot training, medical evacuation, and tourism.
A key feature of the Kizlyar design is its coaxial rotor configuration. This layout allows the engine’s full power to be used for lift, minimizing losses to torque compensation. The coaxial system also results in a more compact airframe, improved maneuverability, and easier operation in confined urban environments. The absence of a tail rotor reduces maintenance risks and enhances safety.
However, the coaxial design requires a more complex transmission and flight control system, which increases production and maintenance costs. Rotor interaction in certain flight regimes can reduce efficiency, and the risk of blade collision necessitates additional engineering solutions.
“A new chapter has begun for our company with the development of the AP-55. The design and production of an advanced helicopter is a testament to the high-tech and research-intensive capabilities of our enterprise,” a KEMZ representative commented on the start of flight testing.
The AP-55 features a five-seat cabin with a volume of approximately 110 cubic feet (3.1 m³). The helicopter has a maximum speed of 160 mph (260 km/h), a range of up to 435 miles (700 km), and a payload capacity of up to 1,320 lbs (600 kg). The AP-55 has already been showcased at HeliRussia 2025 and participated in industry forums, including events organized by the Russian Ministry of Foreign Affairs to promote the development of Dagestan.
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