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A Townend ring is a narrow-chord cowling ring fitted around the cylinders of an aircraft radial engine to reduce drag and improve cooling. It was patented in 1929, and found use on various aircraft of the 1930s and into the 1940s.
On May 15, 1981, the prototype of an improved variant PZL-106B was flown with redesigned wings using shorter struts. It was powered by the same PZL-3SR engine and was produced from 1984. In 1982, the prototype of the PZL-106BS flew powered by the ASz-62IR engine. By 1988, 60 PZL-106Bs had been built.
The test conclusions resulted in almost every radial-engined aircraft being equipped with this cowling, starting in 1932. [ 4 ] The test aircraft, a Curtiss AT-5A Hawk biplane, featuring a Wright Whirlwind J-5 radial engine, reached an airspeed of 137 miles per hour (220 km/h) equipped with the NACA cowling compared to 118 miles per hour (190 ...
In 1968, Consumer Reports, an influential American magazine, acknowledged the superiority of radial construction, which had been developed in 1946 by Michelin. [19] [20] When Charles J. Pilliod Jr. became CEO in 1974, he faced a major investment decision regarding the radial tire, which today has a market share of nearly 100%. [21]
The attempted robbery took place just before 5 a.m. on Dec. 9, according to ABC News' Washington affiliate KOMO. It involved a flatbed truck backing into and shattering the front windows of the ...
The radial engine was enclosed in a NACA cowling to reduce drag. [5] Only two types of engines were offered – the unreliable 185 hp (138 kW) Curtiss R-600 Challenger, which was to be used only in the prototype, and several variants of the Wright Whirlwind family, ranging from 240 to 420 hp (180 to 310 kW). [6]
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