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2. Definitions and operating principle
2.1 Notion of propulsive efficiency
The aim of a propeller is to create a propulsive force by varying the momentum of the air flowing through it (with the best possible efficiency) and to transmit it to the aircraft structure. We need to analyze the definition of propulsive efficiency (different from propeller efficiency, which will be defined later) to highlight the advantages of the propeller (figure 1 , associated with Froude's theory).
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Definitions and operating principle
Propeller pitch control
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References
Certification
The regulations governing propeller certification are mainly laid down by the American (FAR PART 35) and European (JAR-P) authorities.
Research center
Office National d'Etudes et de Recherche Aéronautique (ONERA)
Main helicarists
Ratier-Figeac, France
Hamilton Standard, United States
Dowty Rotol, United Kingdom
Hartzell Propeller Inc, United States
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