DESIGN: AeroVantage ~ PropRotor - Outside Information - Contra-Rotating Props and Related Material

• Performance and Trade Studies of a Mono Tiltrotor Design

• Don Stackhouse talks about Contra-Rotating Props Have hard copy.

• Push-Pull configurations; Dornier Do 335, Adam A500, Cessna Skymaster.

• 3,089,666 Hoverplane by Henery H.W. Quenzler ~ May 14, 1963
• 5,381,985, Wingtip mounted, counter-rotating proprotor for tiltwing aircraft by James K. Wechsler ~ January 17, 1995 Have hard copy.
• 6,655,631 Personal hoverplane with four tiltmotors by John Frederick Austen-Brown ~ December 2, 2003 Have hard copy.

• There appears to be a number of NASA articles on the subject of noise and counter-rotating propellers See; High Speed Turboprop Aeroacoustic Study (counterrotation). Perhaps noise may not be a concern with the large, lower angle of attack, slower turning PropRotors

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