Following the dissolution of the Soviet Union in 1991, Russia and former Soviet states faced a rapid decline in the production of piston aircraft engines. The M-14 engine, a Soviet-era workhorse developed by Ukraine’s Ivchenko Design Bureau and produced by Russia’s Voronezh Mechanical Plant, saw its manufacturing grind to a halt by the mid-1990s. Modified versions like the M-14P and M-14X emerged but failed to meet modern aviation demands. This left light Russian aircraft and UAV manufacturers heavily reliant on foreign engines, particularly Austria’s Rotax (owned by Canada’s Bombardier), which dominated the market due to their reliability and fuel efficiency.By the 2010s, up to 90% of Russia’s light aircraft and UAVs relied on imported engines, with Rotax alone accounting for half of them. The Turkish Bayraktar TB2 drone, a game-changer in modern warfare, also used Rotax engines—until Canada cut off supplies due to their use in the Nagorno-Karabakh conflict. This dependency exposed a critical vulnerability for Russia, especially as geopolitical tensions escalated.In 2013, Russia launched a state-backed initiative to revive domestic engine production. The Agat plant in Yaroslavl, traditionally a supplier of aircraft components, was tasked with developing new piston aircraft engines (PAEs).
By 2015, they unveiled two engines at the MAKS airshow
D-1400 ("Agat-B1") – A high-power model targeting Rotax’s market share.APD-110/120 ("Agat-B") – A horizontally opposed-cylinder engine (similar to Ural motorcycle engines) designed for UAVs and light aircraft.These engines were fully Russian-made, avoiding foreign components, and featured innovations like turbocharging, liquid/air hybrid cooling, and distributed fuel injection. The APD-110/120V (latest variant) was positioned as a Rotax 914 replacement, with 140 hp and the ability to operate in extreme temperatures (-50°C to +50°C).Beyond Agat, Russia established a new design bureau at Samara State University to focus on compact gas turbine and piston engines (150–300 kgf thrust). The goal was to create a unified gas generator that could power multiple aircraft types, improving efficiency over existing models like the PD-14.Western sanctions forced Russia to accelerate import substitution:The Orion UAV, initially using the Rotax 914, switched to the APD-110/120.The Forpost drone (originally Israeli-designed with Australian Jabiru 2200 engines) was completely Russified.The Orlan-10, however, still runs on a Japanese Saito engine, while the Korsar UAV (initially Italian-powered) awaits a Russian replacement.Despite progress, Russia still depends on foreign engines for critical military drones:Chinese Limbach L-550E engines power the Garpiya-A1 attack drone (over 2,500 produced since 2023).Iranian Shahed drones (rebranded as Geran) use simplified engines to boost production, while the Shahed-238 introduces a turbofan variant for higher speeds.The Moscow Aviation Institute (MAI) developed a universal electric motor for drones, achieving 12–16 kW power with mostly Russian components. While promising, it still lags behind Chinese competitors in cost and scalability.
#rotax #UAVEngine #RussianUAV
View: https://www.youtube.com/watch?v=xgBFXEKgUr4
APD aircraft engines – Russian “Rotax substitutes”
After 1991, there were no enterprises left in the post-Soviet space that were engaged in the production of piston aircraft engines for UAVs, light aircraft,
aircraft, motor gliders. Large industrial organizations considered this a burden for themselves. True, there was an M-14 engine, produced by the Voronezh Mechanical Plant. However, since 1994, the production of the unit has actually ceased. Although then for several years its modifications M-14P, M-14X, as well as an improved version M9F were individually produced.
Already in 2015, at the MAKS exhibition, the company presented its new developments - a pair of gasoline piston engines for light aircraft and UAVs. We are talking about the PD-1400 (“Agat-B1”) and APD-110/120 (“Agat-B”) units, designed to eliminate the “dominance” of Rotaxes on the Russian market. NAMI and the GRAT Scientific Center took part in the creation of the engines.
The aircraft engines presented by the plant are not some kind of licensed copy, but completely Russian products, in which there are no imported components. It is curious: the engines are opposite, i.e. the cylinders are located horizontally and the pistons move towards each other, as in
a motorcycle "Ural" or "Subaru" cars.
Engine "Agat-B" (APD-110/120)
It is distinguished by a mixed cooling system: for the cylinder head it is liquid, for the cylinder jackets it is air. The engine with distributed injection is equipped with a compressor with a turbine and a built-in gearbox. The lubrication system has an external reservoir and a “dry” sump. Technical characteristics of the latest modification - four-cylinder model APD-110/120V:
volume - 1,76 l
take-off power (long-term) – 140 (130) “horses”
fuel consumption – 280 g/l. s.*h
length, width, height - 69,9, 69,1 and 71,3 cm
weight – 105 kg without technical fluids

AI-95 “Premium” gasoline is required as fuel. The motor is designed for operation in the temperature range from -50° to +50°. The Rybinsk Scientific Center “Itlan” took part in the development of the engine: “Agat” was engaged in the production of parts.