The Calair CA21 prototype VH-CAL (msn CA21001) flew for the first time at Caloundra in the hands of test pilot, Peter Plaisted. The aircraft was subsequently used as the "Skyfox Research and Development Aircraft" until at least May 1998. In this guise it would have served as the prototype for the succeeding CA22, CA25 and CA25N models.
VH-CAL (msn CA21001) was transferred to the AUF/RAAus Register as 19-4140 and later re-registered 55-4140.
A composite Skyfox airframe was mounted on a pole beside the Bruce Highway at Glenview near Caloundra for the purpose of advertising the Skyfox Flying School. This composite airframe was subsequently removed from its pole and donated to the Queensland Air Museum by the Skyfox Flying School in 2007. This airframe has been statically restored to represent the original prototype VH-CAL in its markings as the "Skyfox Research and Development Aircraft".
* This composite airframe is said to comprise some or all of the following:
|CA21002||nil||Section from an unflown test fuselage|
|CA21003||nil||Section from an unflown test fuselage|