Design Philosophy and Development
Dave Thatcher conceived the CX-5 as a direct response to homebuilders seeking a larger version of his successful single-seat CX-4 design. The aircraft represented Thatcher's commitment to three core principles: affordability, safety, and construction simplicity for amateur builders. Before its maiden flight, the CX-5 underwent rigorous load testing up to 5.7G, demonstrating Thatcher's emphasis on structural integrity over mere performance.
The designer made a deliberate choice to offer the CX-5 in tricycle gear configuration, acknowledging that many homebuilders lacked taildragger experience. This decision broadened the aircraft's appeal while maintaining the option for conventional gear installation for traditionalists.
Technical Innovation and Engine Selection
Thatcher selected the Revmaster R-2300 engine, a Volkswagen air-cooled conversion producing 85 horsepower, based on weight and cost considerations rather than pure performance. This powerplant choice reflected the designer's practical approach to recreational aviation, emphasizing operational economics over speed. The engine's ability to operate on non-ethanol automobile fuel provides operators with approximately three dollars per gallon savings compared to aviation gasoline.
Critical to the aircraft's performance is its wooden propeller specification. Thatcher determined that metal propellers would create excessive weight and impose dangerous forces on the Volkswagen-derived crankshaft, potentially compromising engine reliability and aircraft safety.
Market Reception and Production Statistics
Plans became available for purchase in March 2014, following successful flight testing. By the end of 2015, more than 60 sets of CX-5 plans had been sold to builders worldwide, with several customer-built projects approaching completion. This initial success, while modest compared to the CX-4's nearly 600 plan sales across 20 countries, demonstrated sustained interest in affordable two-seat homebuilt designs.
The CX-5's market positioning capitalized on the proven success of Thatcher's design philosophy. When the CX-5 prototype first flew, the earlier CX-4 had already established Thatcher's reputation in the homebuilt community through its extensive plan sales and successful completions.
Performance Characteristics and Pilot Experience
With a maximum speed of 125 miles per hour and cruise speeds ranging from 108 to 125 miles per hour, the CX-5 prioritizes efficiency over outright performance. Its low stall speed of 38 to 42 miles per hour significantly enhances crash survivability, a design consideration reflecting Thatcher's safety-first philosophy.
The aircraft achieves a useful load between 589 and 599 pounds with its 721-pound empty weight, providing practical payload capacity for two occupants and limited baggage. Its 20-gallon fuel capacity enables ranges exceeding 300 miles, making it suitable for cross-country recreational flying while maintaining fuel economy.
Pilots consistently praise the CX-5's exceptional visibility and responsive handling characteristics. The tandem seating arrangement, while reducing shoulder room compared to side-by-side configurations, provides both occupants with unobstructed forward visibility and enhances the aircraft's aerodynamic efficiency.
Operational Economics and Practical Considerations
The CX-5's operational costs reflect Thatcher's focus on affordable flying. Beyond fuel savings from automobile gasoline compatibility, the aircraft's simple systems and proven Volkswagen-based powerplant minimize maintenance complexity and parts costs. The 1,000-foot-per-minute climb rate and 700-foot takeoff roll make it suitable for operations from shorter airstrips, expanding operational flexibility for recreational pilots.
With a service ceiling of 10,000 feet and never-exceed speed of 155 miles per hour, the CX-5 operates comfortably within typical recreational flying parameters while providing adequate performance margins for safety.
Legacy in Homebuilt Aviation
The CX-5 represents the evolution of affordable homebuilt design from single-seat to practical two-seat configuration without compromising the cost-effectiveness that made Thatcher's designs popular. As customer-built aircraft began flying in 2015 and beyond, the design validated the market demand for simple, economical two-seat homebuilts that prioritize safety and affordability over performance extremes.
The aircraft continues Thatcher's contribution to democratizing recreational aviation, providing builders worldwide with proven designs that emphasize practical flying over technical complexity. This approach has established the CX-5 as a significant option in the contemporary homebuilt market, serving pilots who value operational economy and construction simplicity.