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Boy plays with a balsa glider. In 1948, Paul Guillow applied for a United States patent for a model airplane glider "which can be made in various sizes and can be used for instruction in the principles of airplane flight and design, as well as for the amusement and entertainment of possessors.
Merit (UK) - ceased production of plastic model aircraft sometime in the late 1950s; Merit International (USA) Merlin Model (UK) MGD Models (Czech Republic) Micro Ace (Japan) - ex-Arii; Micro Scale Design (Russia) Midori Plastic. Kit (KSN) (Japan) Mikro72 (Poland) MikroMir (Ukraine) MiniArt (Ukraine) Minibace (China) Minicraft Model Kits, Inc ...
Additionally, surpluses of ultra-lightweight balsa wood left over from the war enabled the company to begin producing flying wooden aircraft models as well as provide raw balsa wood for builders of custom-designed models. [4]
Early versions merely constrained the model to fly in a circle but offered no control. This is known as round-the-pole flying.The origins of control-line flight are obscure, but the first person to use a recognizable system that manipulated the control surfaces on the model is generally considered to be Oba St. Clair, in June 1936, near Gresham, Oregon. [1]
Clay panel or clay board (also known as loam panel, clay wallboard, clay building board, or clay building panel) is a panel made of clay with some additives. The clay is mixed with sand , water , and fiber , typically wood fiber , and sometimes other additives like starch. [ 1 ]
Balsa lumber is very soft and light, with a coarse, open grain. The density of dry balsa wood ranges from 40 to 475 kg/m 3, with a typical density around 160 kg/m 3. [5] [6] [7] Balsa is the softest wood ever measured using the Janka hardness test (22 to 167 lbf). [8] The wood of the living tree has large cells that are filled with water.
When aircraft design progressed beyond the stick-and-fabric boxes of its first decade of existence, the practice of lofting moved naturally into the aeronautical realm. As the storm clouds of World War II gathered in Europe, a US aircraft company, North American Aviation , took the practice into the purely mathematical realm.
Tube-and-fabric construction is a method of building airframes, which include the fuselages and wings of airplanes. It consists of making a framework of metal tubes (generally welded together) and then covering the framework with an aircraft fabric covering. The tubes are usually of steel or aluminum.