Thaden T-4

The Thaden T-4 Argonaut was a 1930s American four-seat all-metal cabin monoplane built by the Thaden Metal Aircraft Company of San Francisco, California.

Design and development
The T-4 was the third and last design of the Thaden Metal Aircraft Company which had been formed by Herbert von Thaden, a former United States Army Signal Corps pilot and engineer, to work on developing the first American all-metal aircraft. The T-4 was a high-wing monoplane powered by a 300 hp Wright Whirlwind radial engine. It had a fixed conventional landing gear with a tailwheel. Two aircraft were built.