OTHER: Helicopter - Inside - Interleaving - with Canard
Compound helicopter where the 'wings' consist of a canard and an enlarger horizontal stabilizer, to augment the lift of the rotors during forward flight.
Note: It may be better if the 'masts' are vertical. This is because the cone of both rotors should provide lateral stability, particularly since the outside blades are providing most of the lift (i.e. the greatest pitch). In this arraignment the tips will be above the roots of the other rotor's blades. Perhaps with a 1ºto 2º greater pre-cone.
The canard and horizontal stabilizer will allow for a reduction in the diameter of the rotors.
Both the canard and the horizontal stabilizer are not subjected to the downwash or the downdraft from the rotors; during hover and during cruise.
The moment arms from the canard and from the horizontal stabilizer are shorter than that which would be necessary for a helicopter with a large single rotor.
The canard may not need to incorporate flight-control, if the rotors are 'Absolutely' Rigid Rotors.
This concept is applicable to OTHER: Helicopter - Inside - Interleaving - Nemesis
This concept should be applicable to the Intermeshing configuration, as well.
The horizontal stabilizer will have positive thrust.
Concern; The canard may impede the pilot's visibility.
"A canard can be use with a rigid head rotor as long as the canard will stall before the HS, but not safely with a gimbaled, teetering rotor." ~ from Rotary Wing by Rotoplane, November 23, 2010
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Initially displayed: October 17, 2005 ~ Posted to PPRuNe; October 20, 2005 ~ Last Revised: November 23, 2010
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