All were powered variants of the high wing, open frame primary gliders widely used for training in the early 1930s, with flat truss fuselages, mostly uncovered and wire braced for lateral rigidity.

[1] The C-1's wooden wings were rectangular in plan out to blunted tips, built around spars with truss-type ribs and ply-covered leading edges.

The wings were mounted on the upper flat-frame tube, from which three short struts provided, along with the lower fuselage, attachment points for wing-bracing wires.

All Cycloplanes were powered by a small flat twin two stroke engine producing 22 hp (16 kW), projecting forwards from the underside of the wing leading edge.

The fin was also triangular in profile and a generous rudder, which reached down to the lower fuselage member, was also straight-edged, though with a blunted tip.