Avro Triplane IV Wing-Warping Detail Needed

[radspadmike]

I’m trying to get started on a 1/12 scale Avro Triplane IV based on the Shuttleworth replica. I hope to make the flight controls functional but am running into problems getting details of the wing warping. Allen Wheeler, in his “Building Aeroplanes for ‘Those Magnificent Men’ “, writes: “The chief complication in the wing structure arose from the very ingenious method for providing wing-warping whereby the outer portion of the rear spars on the two top planes were definitely hinged to allow for the warp distortion without depending on the elasticity of the wooden spar, as was the then practice for wing warping.”

I have several detailed photos of the Shuttleworth aircraft, but none showing this feature. My photos show a cable running from the control column through each side of the fuselage, across the middle wing top surface and running around a pulley attached to the base of a wing strut. . . then I lose it. Also, I can’t make out any hinge details or further cable routing in the photos I have of the wings. I have a copy of a drawing of “the Roe Triplane, 1911” from an issue of “Flight” dated April 1, 1911 which notes “hinge” with a line drawn to a point about two-thirds the distance from the leading edge of the wings (most likely the spar) on the ninth rib in from the outer ends.

Sorry to ramble on but I don’t know how else to describe what I’m looking for. Any help in finding drawings or photos showing this feature will be greatly appreciated.

Mike