Dartex (oz1770)

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Dartex (oz1770) by K Brown 1954 - plan thumbnail

About this Plan

Dartex. 22 in span delta for Jetex 100. From Model Aircraft March 1954.

Quote: "Stable Jetex 100 powered delta-form model. Dartex, by K Brown.

COMMENCE by laying out the outline of the wing directly over the plan, using 1/16 in sheet medium balsa for both leading and trailing edges Cut out the 1/8 in sheet motor mount from hard balsa, and pin down in position over the plan, then cement in position the centre rib (R1). Cut and fit two pieces of 1/4 in x 1/8 in hard balsa, cementing them one on each side of R1, on top of the motor mount.

Next, cut and cement in place all the under surfaces of the ribs, using 1/16 x 3/32 in medium balsa. The ends of these strips are butt-jointed to the leading and trailing edges. Cut out the spars, A, B and C from medium hard balsa, and cement in place on top of the 3/32 in strips. Whilst these are drying, cut out the strips for the upper surfaces of the ribs, using soft balsa. Cut these to length, not forgetting to allow for the excess length caused by the curvature of the ribs.

Now start at the centre and work outwards towards the tips, cementing to the leading edge only. Having completed one half of the wing, do the same for the other half. Make sure that the joints are properly dry before proceeding further. Now start at the centre again, and bend over each strip, cementing at the spar junctions, and finally cement to the trailing edge. It may be found necessary to steam the strip used for the extreme tip rib, although this ran be overcome by using a softer grade of balsa.

Fuselage. With the wing still pinned down to the building board, cut out the fuselage horizontal crutch from 1/16 in medium balsa sheet, and cement to the leading edge. Do the same with the upper half of the fuselage vertical crutch. Make and fit the front bulkhead..."

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Dartex (oz1770) by K Brown 1954 - model pic

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Scaling

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