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the proper angle of the nose wheel for minimum shimmy and maximum control under all operating conditions. Following these special tests he started the design of the transport plane. Known as the Timm T-840, it could carry up to ten passengers and 500 pounds of mail. It was a high-wing monoplane of 50-foot span, using either two Wright R-975E or Pratt and Whitney Wasp Junior engines. The plane weighed 5,280 pounds empty and had a cruising speed of 196 mph, with a maximum speed of 210 mph.

The first plane was completed in March, 1938, and was successfully test flown in April. This was the first transport plane in the United States with tricycle landing gear, which was patented by Timm. Being crowded for space in his hangar at Grand Central Airport, Timm then leased some factory buildings, called the Woodley plant, at the Metropolitan Airport, Van Nuys, California, in the fall of 1938.

While test work was in progress on the T-840 transport Timm started looking into the primary training plane market and started to experiment with plastic bonded plywood for plane construction. These tests were very encouraging and this method became known as the Timm Aeromold Process. As a result Timm decided to build a low-wing monoplane 2-place trainer using this type of construction. Called the PT-160 it had a span of 36 feet, an overall length of 24 feet, and used a 160 [[strikethrough]] horsepower [[/strikethrough]] h.p. Kinner radial engine. 

A prototype, primarily intended for civilian training, was flown to Washington, D.C., and Wright Field, Dayton, Ohio, for demonstrations before government officials. They were pleased with the plane but wanted more power, so Timm made a few changes and installed a 220 [[strikethrough]] horsepower [[/strikethrough]] h.p., 7-cylinder Continental radial engine. This greatly improved the performance of the plane, designated the PT-220, was then demonstrated to the Navy Department who awarded Timm a contract for 750 planes. This Navy version became the N2T-1. 

Development work on the T-840 transport plane was suspended and more factory

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