Advanced Cambered Wing Tractor (oz3802)

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Advanced Cambered Wing Tractor (oz3802) by Carl Goldberg 1938 - plan thumbnail

About this Plan

Goldberg Advanced Tractor.

Quote: "Here are plans for a 150 sq inch indoor microfilm covered tractor by the great Carl Goldberg published in a Chicago Park District handbook from 1938. I got it as a reprint by Charlie Bauer of 4Pi, Inc. The airfoil has about 6.7% camber (3/8 inch per 5.5 inch chord) and is TLAR, matching a French curve I have. These days a 4-6% camber Simplex (logarithmic spiral) airfoil would probably be used, since it is easier to trim to the elliptical plan. In those days, when a computer had 2 legs and a pencil behind his/her ear, French curves were much in use. An article on wing design by Avrum Zier on wing design in Flying Aces November 1934 called for a No.13 French curve to make airfoils, with high point at 30% of chord.

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