What are the disadvantages of a rotary engine?

[VanRobert]

The disadvantages of a rotary engine are high fuel consumption, severe wear, and lack of standards. Disadvantages of a rotary engine: High fuel consumption and heavy pollution. Due to the lack of a high compression ratio like reciprocating engines, combustion is not very efficient. Severe wear and short lifespan of components. Since a triangular rotary engine has only one radial seal between adjacent chambers, the radial seal is always in line contact with the cylinder, and the three combustion chambers are not completely isolated, leading to rapid wear of the radial seal. Some standards are lacking. Due to the differences in operational characteristics between rotary and reciprocating engines, the actual displacement of a rotary engine is multiplied by two for comparison with reciprocating engines. Advantages of a rotary engine: The advantages of a rotary engine also include a high power-to-displacement ratio (the engine can output more power with a smaller displacement), compact size, light weight, low center of gravity, and minimal vibration.