Development and Design
The MH-46 Eclipse emerged from Aerosette's progression through ultralight aircraft development, following their earlier MH-45 ESO design. The Czech manufacturer, based in Chrastava, entered the ultralight market during the early 2000s boom in recreational aviation, when advances in composite construction and reliable small engines made sophisticated ultralight aircraft commercially viable.
Aerosette's designers created the Eclipse to meet Fédération Aéronautique Internationale microlight rules while providing performance approaching that of certified light aircraft. The aircraft's strut-braced high-wing design prioritized stability and ease of handling, characteristics essential for its dual role in personal recreation and flight training operations.
Construction and Configuration
The MH-46 Eclipse features composite construction throughout its airframe, representing the modern approach to ultralight manufacturing that replaced earlier tube-and-fabric designs. The aircraft's 9.71-meter wingspan is supported by single struts on each side, creating 11.5 square meters of wing area optimized for the aircraft's 472.5-kilogram maximum gross weight.
The enclosed cockpit measures 1.2 meters wide at the pilot's elbow, providing comfortable side-by-side seating for instructor and student or pilot and passenger. This configuration proved particularly valuable for training operations, where communication and shared controls enhanced the learning experience. The fixed tricycle landing gear simplified ground handling and reduced maintenance requirements compared to retractable systems.
Powerplant Options
Aerosette offered the Eclipse with two Rotax engine options, reflecting the Austrian manufacturer's dominance in the ultralight and light sport aircraft market. The standard powerplant was the 64-horsepower Rotax 582, a two-stroke engine that provided adequate performance while maintaining lower weight and cost.
For operators seeking enhanced performance, the 100-horsepower Rotax 912ULS four-stroke engine became available, delivering 75 kilowatts of power through its liquid and air-cooled four-cylinder configuration. This engine choice elevated the Eclipse's maximum speed to 250 km/h while maintaining a fuel-efficient cruise speed of 220 km/h. The aircraft's 130-liter fuel capacity provided substantial range for cross-country flights.
Performance Characteristics
The Eclipse's performance envelope reflected its design priorities of safety and accessibility. With a stall speed of just 65 km/h with flaps deployed, the aircraft remained controllable at low speeds essential for training and short-field operations. Its rate of climb reached 8.7 meters per second, allowing rapid altitude gains despite the relatively modest power loading.
The aircraft's structural limits of +4/-2 G permitted moderate aerobatic maneuvers while maintaining ultralight certification requirements. The never-exceed speed of 298 km/h provided adequate margin above normal cruise speeds, though pilots appreciated the Eclipse's docile handling characteristics more than its ultimate performance capabilities.
Operational Service
The MH-46 Eclipse found its primary market among European pilots seeking sophisticated ultralight aircraft that bridged the gap between basic recreational machines and certified light aircraft. Flight schools adopted the type for primary training, where its side-by-side seating and stable flight characteristics proved advantageous over tandem-seat alternatives.
Private owners valued the Eclipse's cross-country capability, with its combination of reasonable speed, substantial fuel capacity, and enclosed cockpit enabling flights that would challenge open-cockpit ultralights. The aircraft's composite construction required less maintenance than metal alternatives while providing superior corrosion resistance.
The Czech Aviation Industry
Aerosette's development of the Eclipse reflected the broader emergence of the Czech Republic as a significant player in general aviation manufacturing following the end of communist rule. The country's combination of aeronautical engineering expertise, lower manufacturing costs, and access to European markets created opportunities for innovative companies like Aerosette to compete with established manufacturers.
The success of Czech ultralight and light sport aircraft manufacturers demonstrated how smaller companies could exploit niche markets overlooked by major aerospace corporations, particularly in the growing recreational aviation sector.
Legacy and Current Status
While production numbers for the Eclipse remain limited compared to mass-produced aircraft, examples continue operating throughout Europe and beyond. Used aircraft occasionally appear on the international market, with low-time examples commanding premium prices reflecting the type's reputation for quality construction and reliable operation.
The Eclipse represents the evolution of ultralight aircraft from simple recreational machines to sophisticated platforms capable of serious cross-country flying while maintaining the regulatory advantages of ultralight certification. Its development marked an important step in the maturation of the European ultralight industry during the early 21st century.