Jamboree (oz10675)


Jamboree - plan thumbnail image

About this Plan

Jamboree. Control line stunt model.

Quote: "Marine Modeler's latest stunt plane. Precision aerobatic ace. Noted designer of the Jezebel (oz2138) team racer is back with one of the prettiest stunters for engines in .19 to .23 group. Jamboree, By Lt Col HM Bourgeois, USMC.

This gal is the fast-flying, high-performance, precision aerobatic model whose delightful dancing antics on the end of two silver lines, to the tune of a whining, screaming engine, will bring smiles to the face of any true modeler. Like most good-performing models it is the culmination of many designs. The original basic design was laid down by Keith Foster, with whom I had the pleasure of building, designing, and flying models for many years in San Diego. Although Jamboree is close to the final design. there is always some kind of improving and redesigning to be done. Through the years the design progressed through all sizes and shapes in the hunt for the ultimate design.

As the design of the Jamboree progressed through the many phases of development, several basic requirements for a satisfactory acrobatic model were established. First and the most important: the model must be light; 9 ounces per square foot of wing area proved to be about the ideal for a medium-size model of about 40 in wing span. Lightness demands good light firm balsa, both for strength and finish. The tighter the grain of the balsa, the less filler required for a good finish, and the lighter the model. It was found possible to build models much lighter than the 9 ounces per square foot of wing area. However, these models were not rugged enough to stand the vibration of high-power engines and the constant variation of G forces imposed on the model in flight.

The second requirement is for a good reliable engine and fuel system. Many types of engines were tried and discarded. The top engines for violent maneuvers appear to be the front rotary shaft intake kind. Engines of the Torpedo, Fox, and Veco variety have well demonstrated their capabilities in contests throughout the nation. The fuel tank found here to give the most reliable constant fuel feed is the custom built 'Master' stunt tank. This tank is available in many sizes, and when properly installed will make the most balky engine perform satisfactorily.

The last requirement is an airfoil of proper design. The airfoil shown is the result of many trials and tests of thick, thin, reflex, streamline, and unsymmetrical airfoils. It is of about 15% thickness, allowing enough depth for spar strength, and yet is not so thick as to slow the model in its maneuvers. Many versions of wing flaps were tried and discarded as unnecessary weight and complexity, contributing nothing to the performance of the model that proper design would not take care of. Extremely large elevators are unnecessary and add weight.

Streamlining and smooth finish do much to improve the model's performance and take only a little more effort to produce. It might be argued that the tricycle landing gear has more drag than the conventional two-wheel gear; though this is true, the most inexperienced modeler can make good take-offs and landings with the tricycle gear in the worst conditions of wind and terrain.

Construction of Jamboree is surprisingly simple and conventional except for the wing. This is by far the strongest and lightest wing I have ever produced. The wing should be completely finished before installation in the fuselage. Pin the bottom 3/16 in spar to a board, place three or four ribs on the spar along its entire length. Using scrap wood, cut small wedges and block up the bottom 1/16 in sheet trailing edge and glue all the wing ribs to the spar and the trailing edge..."

Quote: "Good day! This one is Hobby Helpers #155, 35.5” span Jamboree control line plans from 1955 for .19 to .35 for engines. The plans are by H. M. Bourgeois and were published in Air Trails magazine in January 1955. I came across these in an estate sale, so unfortunately I don’t have much supporting information. I hope they find value with some of your followers!"

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User comments

Henry Bourgeois, designer and builder of plan 10675 and others, was an original AVG pilot and continued with Marine aviation through WW2. He was an active controlline builder and flyer in New Orleans post war.
EdShearer - 04/12/2018
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