Development and Design Evolution
Claude Piel's journey toward the Super Emeraude began with his original CP-30 Emeraude design in the mid-1950s. The prototype CP-30 first received French certification on August 10, 1954, with registration F-PFXY, followed by commercial certification on September 12, 1955, after extensive testing between April and June of that year. By the early 1960s, working at Scintex Aviation, Piel recognized the need for a more robust variant that could handle aerobatic flight while maintaining the fundamental reliability that made the original Emeraude successful.
The Super Emeraude represented a significant engineering advancement over its predecessor. Piel incorporated a strengthened airframe capable of withstanding aerobatic loads, cleaned-up aerodynamics that improved performance, and refined control surfaces including slotted flaps and Frise-type ailerons. These modifications, combined with optimized wing geometry, created an aircraft that remained stable in significant crosswinds while offering enhanced maneuverability for training purposes.
Production and Manufacturing
Scintex Aviation launched production of the Super Emeraude in multiple variants during the 1960s. The CP-1310, powered by the Continental O-200 engine, saw 23 aircraft completed, while the CP-1315 variant with the French Potez 4E engine accounted for 17 additional machines. Much of Scintex's production was contracted to CAARP (Constructions Aéronautiques Auguste Rudry) in Beynes, France, where Auguste Mudry oversaw the completion of 11 final certified aircraft between 1965 and 1973.
The design's international appeal led to licensing agreements across multiple countries. Binder-Aviatik in Germany produced both homebuilt and factory-constructed versions, with 60 CP-301 aircraft completed, including 22 certified factory-built Smaragd variants powered by 90-horsepower Continental C90 engines. The global reach extended further, with over 110 Emeraude family aircraft constructed in America, Canada, New Zealand, and South Africa.
For amateur builders, Piel released the CP-320 variant with plans specifically reviewed and simplified for homebuilt construction. This version proved remarkably enduring, remaining in continuous production by amateur constructors well into recent decades, demonstrating the design's lasting appeal and buildability.
Service History and Impact
The Super Emeraude found its primary role within French aero-club operations, where Piel aircraft constituted a significant portion of training fleets from the early 1960s through the late 1970s. The aircraft's combination of forgiving handling characteristics and aerobatic capability made it ideal for both primary flight training and advanced aerobatic instruction. Its side-by-side seating configuration facilitated effective communication between instructor and student, while the aircraft's stable platform allowed pilots to focus on developing fundamental flying skills.
The Super Emeraude's influence extended beyond its direct service record through its role as the developmental foundation for the CAP-10 series. Auguste Mudry, working at CAARP, used the Super Emeraude's proven design elements as the basis for creating the CAP-10, CAP-10B, and CAP-10C aircraft. These advanced aerobatic trainers incorporated the fundamental strengths of Piel's design while adding more sophisticated systems and enhanced performance capabilities.
Technical Specifications and Performance
The Super Emeraude's wooden construction utilized a laminated box spar design with an elliptical trailing edge, providing both structural integrity and optimal aerodynamic efficiency. The low-wing cantilever configuration eliminated the need for external bracing while maintaining the clean lines essential for aerobatic certification. Fixed tailwheel landing gear kept maintenance requirements minimal while preserving the classic lines that characterized the design.
Engine options varied significantly across production variants. The Continental O-200 in the CP-1310 delivered 100 horsepower, providing adequate performance for both training and aerobatic operations. The French Potez 4E engine in the CP-1315 offered 105 horsepower, while some variants utilized the Lycoming O-235. This engine flexibility allowed operators to select powerplants based on local availability and maintenance considerations.
Legacy and Continuing Influence
The Super Emeraude's most significant legacy lies in its role as the ancestral design for modern aerobatic training aircraft. The progression from Piel's original concept through the Super Emeraude improvements ultimately led to the CAP-10 series, which continues in production and operation today as one of the world's premier aerobatic trainers. This evolutionary chain demonstrates how thoughtful design refinement can create lasting impact across multiple generations of aircraft.
Amateur builders continue constructing CP-320 variants decades after the original design's introduction, testament to both the aircraft's enduring appeal and the quality of Piel's engineering. At least one notable example, built by Robert Mann in the United States, required three and a half years of construction before its first flight in 1978, illustrating the dedication these aircraft inspire among builders.
The Super Emeraude represents a crucial bridge in general aviation development, connecting the post-war era of simple training aircraft with the modern generation of sophisticated aerobatic machines. Through its service in French aero-clubs and its influence on subsequent designs, the Super Emeraude helped establish the foundation for contemporary pilot training methods and aerobatic instruction techniques that remain standard practice today.