World Tailless Record Holder (oz3340)

About this Plan

World Tailess Record Holder. A 40 in span glider or power FF model, from Model Aircraft, October 1949.

Quote: "The World Tailless Record Holder, by J Marshall.

THIS model was designed primarily as a duration contest model and is the result of experience with a long line of tailless models. To date its achievements are as follows: SMAE Tailless Contest, 1948, 3rd place. Isle of Man Rally, 1948, President's Cup, 1st place. Isle of Man Rally, 1948, Phillips Cup, 1st place. British Tailless Record Holder, 1949. World Record Holder (Category IIIB), 1949.

Construction. Wing. First cut out a set of ribs for the outer panels, the slots for the spars, etc being cut at an angle. Assemble ribs, spars, leading edge, and trailing edge on the plan. The latter is not slotted, but is cemented on to the ribs with the bottom surface packed up to continue the lower contour of the root rib (4).

Cement in the trailing-edge gussets and carve the trailing-edge to shape with a sharp knife. From ribs 4-8 most material is cut from the top surface. At rib 9 a symmetrical amount is cut from the top and bottom. From ribs 10-14 carve away the underside progressively and sand away a little of the top surface between ribs 12-14.

Pack up the tip rib to -7 deg. incidence and sheet the leading and trailing edges. This will maintain rigidly the washout. The diagonal struts prevent the wing from closing up like a trellis - a thing which heavily swept wings are prone to do..."

Update 13/11/2018: Replaced this plan with a clearer copy, thanks to DBHL, theshadow.

Scan from DBHL, cleanup by theshadow.

ref DBHL-7303.

Direct submission to Outerzone.

Supplementary file notes

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