The Piel CP-30 Emeraude (French: émeraude = "emerald") is an aircraft designed in France in the mid-1950s and widely built both by factories and homebuilders.

The aircraft uses wood construction with a laminated box spar with an elliptical trailing edge.

[1] The prototype was designed and built by Claude Piel, who then licensed manufacture of the aircraft to a number of firms, most significantly Coopavia.

Much of Scintex's Super Emeraude production was contracted out to CAARP, where the design eventually served as the basis for the CAP-10.

The first aircraft (G-APNS) was built at White Waltham and first flown on 1 September 1958 by Squadron Leader Neville Duke.