[1] Folkerts worked for Central States Aero in Davenport, Iowa designing and building the prototype Monocoupe Model 22 in four months for Donald Arthur Luscombe.

By the end of 1928, 90% of all light planes and 10% of all licensed airplanes owned in the U.S. were Monocoupes, which remained in production until 1950.

During World War II, Folkerts managed assault glider production.

In 1993 Folkerts was inducted in the Iowa Aviation Museum Hall of Fame.

[2] The 1928 Folkerts Henderson High Wing was restored in 1965 for display, and resides in the EAA Airventure Museum in Oshkosh, Wisconsin.