U-2 (Utility-2). Control line stunt model for for OS Max .35 engine.
Quote: "Born in mystery the U-2 configuration lends spirit to this Controline Stunter extraordinary. U-2 Stunt Spyplane, by Joe Adamusko.
The U-2 Sky Spy, ('U' standing for utility), was built by Lockheed in Clarence 'Kelly' Johnson's super-secret Skunk Works in an incredible 80 days. From 1956 until 1960 the U-2 flew over the continent's of the world virtually unmolested, until one was downed by a Russian surface to air missile. Then there was Francis Gary Powers who probably added a maneuver or two to the stunt pattern as he piloted the downed aircraft before becoming a national figure in the following U-2 crisis. The style and look of this airplane has always eluded me for some reason, but in the summer of 1972. I became acquainted with the details surrounding this fascinating airplane. Immediately, the U-2 seemed like a natural Controline stunt ship. Long straight wing and tail surfaces, beautifully proportioned sculptured curves to the fuselage, and amazing compatibility in implementing thrust line and moment arm arrangements.
But there were minor technical problems that had to be overcome for development of a bicycle fuselage landing gear system that would work. In addition, there was the creation of large air intakes on either side of the fuselage that would prove tedious in the making. Yet if these two elements were accentuated I felt the semi-scale nature of this jet type stunter would be greatly enhanced.
Everyone who is into models looks at airplanes differently. I personally have a tendency to lean toward the jet aircraft theme. Unlike World War II fighter designs, to me the jet age offers unlimited possibilities for subject choice. And it is my firm belief, that if these new ideas can be configured into efficient Controline Stunt designs there will be a giant step forward in the advancement of the art coupled with a refreshing and distinctive look to further its appeal. Can you picture a T-tailed, axial-flow MIG-15 stunter? I can.
Then there are those long winter months to contend with. This is where semi-scale airplanes prove their worth. No one observes my airplanes fly more than I do, so I'd rather build one I won't tire of looking at. Otherwise typical construction takes on a new facet and my enthusiasm builds during the many days needed to create a truly fine Stunt ship. It was fall when my final work drawings were complete and my thoughts quickly changed to planning all necessary moves to complete my project.
With the increased cross-section of fuselage needed to create a near scale focal point for the U-2 stunter additional finished model weight was anticipated. I chose to use a balsa sheeted foam wing to give me a weight saving advantage. This was my first application of a foam wing in a stunt ship and I found the result to be far superior to the built-up wing configure lions I had previously used. The foam wing used in the original U-2 was obtained from Control Specialties Company, 110 Egel Avenue, Middlesex, New Jersey 08846. This company is also an excellent source of technical information about the field of Controline aerobatics.
The technique used in building the fuselage is the conventional box and hollowed block construction. Careful attention must be paid to creating a very light weight assembly due to its great mass. The bulk of the component parts, as well as the finishing techniques are similar to many of the fine stunt ships depicted in past Flying Models publications.
The fuselage will dwell on the construction details surrounding the fuselage because it provides quite a challenge of one's building skills. You will find the finished result quite different for a semi-scale Stunt ship.
Begin by cutting the fuselage sides from 1/8 in soft sheet balsa. Study the side view of the fuselage and note where the plywood doublers end. Cut the doublers and nose ring from 1/16 plywood. Provide lightening holes in the plywood doublers where indicated on the plans. The lightening holes should be extended to inside the tank compartment, however, be sure not to cut a lightening hole in the plywood surfaces that will join to the motor mounts or F-1 and F-2 formers. This is an excellent way to save weight and still maintain adequate strength..."
Update 11/09/2018: added article, thanks to RFJ.
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