The aircraft is supplied as plans for amateur construction.

[1][2] In the late 1990s, it was also marketed as plans and in kit form by Bell Aeromarine of Leicester, UK.

[3] The Z-21 is a single-seat, open cockpit 1920s-style biplane with fixed conventional landing gear with spoked wheels and a single engine in tractor configuration.

[1][2] In August 2014 there were eleven Flitzers registered in the United Kingdom.

[4] Data from Bayerl and Tacke[1][2]General characteristics Performance