Class C Stick Tractor (oz3593)

 

Class C Stick Tractor (oz3593) by Conrad Renning from Model Airplane News 1939 - plan thumbnail

About this Plan

Class C Stick Tractor. Free flight rubber contest model.

Quote: "A Winning Stick Tractor. How You Can Build and Fly a Model of Unusual Type With a Contest Winning Performance. Bt Conrad Renning.

IN RECENT years the tendency in model design has been toward a high rate of climb with a short motor run. However the author, among others, has adhered to the policy of medium rate of climb with an extended motor run. The model of which plans are presented here is an example of the latter and has proved very consistent in contest work. The design is the result of several years of experimenting by the author and in 1935 the author made a flight of 34 minutes with a model similar to the one shown. While the power may seem small the original model flew well under all weather conditions.

Fuselage. The triangular cross section of the stick makes construction comparatively easy, and the author has found that an easy method of construction is to lay out the top of the framework first. Leaving this part on the work board you add the up-rights and the bottom longeron. After the framework has dried remove it from the board and add formers and stringers as indicated on the plan.

The tailboom is cut off at the point indicated on the plan. The rear plug is a piece of 1/4 in balsa cut to fit snugly inside the rear end of the stick and is glued to the tailboom with 1/8 in protruding. The rear hook is made of 1/16 wire anchored securely to the rear plug.

Wing. Using the airfoil shown on the plans cut 23 ribs from 1/20 in medium grade 'C' stock. Pin the trailing edge in place and add ribs and leading edge, glueing all joints well. When dry remove from the plans and add bamboo tips. Crack the leading and trailing edge at the center. Raise each tip four inches for dihedral and apply glue generously at center..."

Quote: "Here is a PDF format full-size plan and the accompanying construction article for the Class C Stick Tractor rubber-powered endurance model designed by Conrad Renning and published in the August 1939 issue of Model Airplane News. I employed the given 36-inch wingspan as a metric for scaling the full-size plan."

Supplementary file notes

Original article text, 2 pages.

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Class C Stick Tractor (oz3593) by Conrad Renning from Model Airplane News 1939 - model pic

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  • Class C Stick Tractor (oz3593)
  • Plan File Filesize: 1029KB Filename: Class_c_stick_tractor_plan_oz3593.pdf
  • Supplement Filesize: 421KB Filename: Class_c_stick_tractor_plan_oz3593_article.pdf
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Notes

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Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

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