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List of trainer aeroplanes
''This article is about single engine fixed wing aircraft. For single engine rotorcraft and Helicopters, see Helicopter''

Single engine airplane
Single-engine aeroplanes are fixed wing aircraft with only one primary engine and, usually, one propellor. It is the mainstay of private pilots and are essential for pilot training. Widely used in general aviation, single engine aircraft are characterized by the simplicity and cost-effectiveness compared to multi-engine aircraft and has a wide range of possible applications.

the greater complexity in control and maintenance, greater cost

The main disadvantage of a single engine aeroplane compared to multi-engine aircraft is less safety and a lower payload capacity per plane. Aviation authorities' regulations demand redundancy of propulsion.

"This obviously cannot be achieved with a single engine. The engine failure case is considered too likely and its consequences and too severe to allow single engine airplanes to legally carry more than a handful of paying passengers." The principle of redundancy is present in most aspects of the design of passenger airplanes.

Although it is common for rotorcraft, it is rare that more than one engine has been used to drive a single propellor, like with the Atlas Mono-Twin, or a single engine was used to drive two propellors. Examples of the latter is the first Wright flyer, having two propellors side by side, driven by belts from the single engine. On more modern planes contra-rotating props may be used, like with the Avro Shackleton. Many helicopters have two engines driving the main rotor, like the UH-1N Twin Huey, and some tilt-rotor convertiplanes have one engine, like the Bell XV-3.

Quote: "Advantages of Single-Engine Aircraft Cost-Effectiveness: The maintenance and operational costs of single-engine aircraft are generally lower than those of multi-engine aircraft of the same size, primarily due to the presence of only one engine. This advantage is negated in larger aircraft by their economy of scale when their larger capacity is fully utilised. Simplicity: The design and mechanics of single-engine aircraft are simpler than those of multi-engine variants, contributing to ease of maintenance and operation. Versatility: Single-engine aircraft can operate from shorter runways and in more varied environments than many multi-engine aircraft."