Folkerts SK-1

The Folkerts SK-1,Speed King One, Mono Special, Matilda, Fordon-Neumann Special, Hardwick-Whittenbeck Special was a racer built for the 1930 American Cirrus Aircraft Engine Company sponsored American Cirrus Derby.

Folkerts SK-1

The Folkerts SK-1,Speed King One, Mono Special, Matilda, Fordon-Neumann Special, Hardwick-Whittenbeck Special was a racer built for the 1930 American Cirrus Aircraft Engine Company sponsored American Cirrus Derby.