07/31/2012. Remarks by Walter van Tilborg: "Ken Brock has been involved with rotorcraft design, construction and flight testing since 1957, and was the southern California distributor for Bensen Aircraft between 1960 and 1980. As early as 1964 he made a cross-country flight of 450 mls (724 km) in a gyroplane, from El Mirage, California, to Las Vegas, Nevada, and back.

Design of an aircraft suitable for construction by amateurs from kits of parts began in 1970; the pictured prototype was based on the Bensen B-8M, hence N2303 is registered as a Brock KEB B8M. It flew before the end of 1970, and during a ten-day period in 1971, Brock used this prototype for a world record transcontinental flight over a distance of 3,400 mls (5,471 km) between Long Beach, California, and Kitty Hawk, North Carolina.

The gyroplane went into series kit production in 1979 as the Brock KB-2 Freedom Machine. Eventually Brock donated the prototype to the museum."