Attack Helicopter Evaluation AH-56A Cheyenne Compound Helicopter

Johnson, John N.; Bender, Gary L; McClellan, Randy D; Burden, John R.; Larsen, Morrie E.

doi:10.21236/ad0771914

Cited by 5 publications

(1 citation statement)

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“…The use of the propeller in the`windmill' state has two important advantages for the compound helicopter. The ®rst is that by using reverse pitch it acts as an extremely effective braking device to slow the aircraft or hold the speed steady in a dive, as was found with the Lockheed AH-56A Cheyenne [29]. This application of reverse pitch allows the elimination of the`hop' that occurs when attempting to slow the conventional helicopter quickly.…”

Section: Propellermentioning

confidence: 99%

The fundamental configuration and design of the compound helicopter

Orchard

Newman

2003

Proceedings of the Institution of Mechanical Engineers, Part G:

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The compound helicopter has much to offer as a means of expanding the¯ight envelope of rotorcraft. There have been signi®cant amounts of research performed, albeit disjointed, and manȳ ight demonstrator compound helicopters produced and trialled since the end of the Second World WarÐmainly with the aim of increasing the helicopter's maximum forward speed. This paper aims to pool this knowledge, along with relevant developments in other ®elds, not only to state the current level of understanding of the compound helicopter con®guration but also to use it to predict likely con®gurations and technologies that would be best suited to future compound helicopter designs. From this basis it is suggested that the most likely con®guration will be a low wing of minimized area to alleviate retreating blade stall at a minimum hover blockage, with plain¯aps for blockage reduction and control of the rotor±wing load share. In terms of propulsion a ducted fan or propeller are deemed most suitable, driven by either an advanced mechanical drive or variable cycle engine. The areas of rotor±wing interaction and advanced rotor design are also noted as subjects of signi®cant interest in the optimal design of a compound helicopter.

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Section: Propellermentioning

confidence: 99%