Isis (oz8892)

About this Plan

Isis Rubber competition model, designed in 1939, published in 1941.

Quote: "THE Isis was designed in the early part of 1939 for the benefit of the members of the Oxford Model Flying Club, with the object of producing a high performance machine conforming with the Wakefield regulations, which would at the same time be robust of construction and moderately easy to build.

The design exhibits several departures from popular practice, and can be considered as a step between the beginner's machine and the full 'streamliner.' The winning of the Gamage Cup in two consecutive years has justified its design.

Fuselage: is of square cross section built up from four longerons of 1 in square hard balsa. The struts separating the longerons are built up from 1/16 by 1/8 balsa strips to form members of 'T' section, and those forming the side panels are disposed in the Warren girder style to produce the maximum possible rigidity in the vertical plane and accuracy of trim.

The curvature of the longerons at the nose end of the fuselage is somewhat more acute than usual, and it is advisable to steam them to the required curvature before building up the sides.

Build up the two sides first, using flat strips of 1/8 by 1/16 balsa which have been pre-cemented on one side. Note carefully that sufficient space must be left between the ends of the Warren strutting to allow the top and bottom struts to be inserted between the ends. This is clearly shown in the drawing, also in the special perspective sketch illustrating a typical completed joint..."

Scan from DBHL, cleanup by theshadow.

ref DBHL-5831.

Direct submission to Outerzone.

Update 18/06/2018: added article, thanks to Skippy.

Supplementary file notes

Article.

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