rotorcraft ground resonance

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resonance — The energetic vibration of a body produced by application of a periodic force of nearly the same frequency as that of the free vibration of the affected body. It is the condition of two bodies adjusted to have the same frequency of vibration.… … Aviation dictionary
Helicopter — For other uses, see Helicopter (disambiguation). Helicopter An LAPD Bell 206 … Wikipedia
Saunders-Roe Skeeter — Skeeter Skeeter W 14 Role Trainer, Scout Manufacturer … Wikipedia
Aérospatiale Dauphin — Infobox Aircraft name= SA 360 Dauphin caption= type= utility helicopter manufacturer= Aérospatiale designer= first flight= 2 June 1972 introduced= 1976 retired= status= primary user= more users= produced= 1976 77 number built=2 prototypes + 34… … Wikipedia

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