Revolutionary Design Philosophy
The H-2 emerged from Dynali's ambitious goal to democratize helicopter aviation through innovative engineering and cost-conscious design. Jacques Tonet, working alongside Theirry Blanchet, prioritized simplicity and reliability over complexity, creating what the company described as "a small, very safe, high-performance helicopter at a relatively modest cost." This philosophy guided every aspect of the aircraft's development, from its straightforward control systems to its use of automotive engines.
Safety Innovation
The H-2 incorporated several groundbreaking safety features rarely seen in light helicopters of its era. The cabin structure featured a progressive deformation safety cage based on Formula 1 racing car principles, designed to protect occupants during impact scenarios. The main rotor blades utilized a sophisticated construction method borrowed from Eurocopter, featuring a central spar of foam and carbon lined with carbon fiber and polyurethane foam, finished to a NACA 23112 airfoil profile. This construction demonstrated exceptional fatigue resistance while maintaining the structural integrity essential for safe flight operations.
Perhaps most notably, the H-2 featured a Fenestron-type tail rotor with eight carbon and Kevlar composite blades housed within a protective shroud. This design significantly reduced noise levels compared to conventional exposed tail rotors while virtually eliminating the risk of ground personnel injuries during ground operations.
Powerplant Evolution
The H-2's engine development reflected the growing trend toward automotive powerplants in light aircraft. Initially equipped with the 97-kilowatt Rotax 914 turbo engine, the aircraft later standardized on the 134-kilowatt Subaru EJ-25 four-cylinder engine from August 1, 2005. This liquid-cooled automotive engine offered several advantages, including the ability to operate on readily available 95-octane automotive gasoline rather than expensive aviation fuel.
The more powerful H-2S variant, featuring the Subaru powerplant, delivered substantially improved performance in hot and high conditions while offering greater payload capacity. Some aircraft, including the first H-2S imported to Australia (registration VH-BBT5), received modified 142-kilowatt versions of the Subaru engine, further enhancing performance capabilities.
Manufacturing and Certification
Dynali achieved French certification for the H-2 on October 28, 2004, in the CNSK2 category specifically created for kit-built helicopters. This certification pathway reflected the aircraft's dual availability as either a factory-completed helicopter or a kit requiring approximately 200 hours of assembly time. The introduction of new European microlight helicopter regulations in 2011 significantly accelerated production by streamlining the certification process for light rotorcraft.
Production took place at Dynali's facility in Nivelles, Belgium, located 30 kilometers south of Brussels. The company established an international dealer network spanning France, Belgium, Africa, the Arabian Peninsula, and Spain to support global sales efforts.
Construction Excellence
The H-2's airframe featured a monoblock tubular stainless steel chassis serving as the structural foundation for all major components. Tubular aluminum skids, attached with triple energy-absorbing supports, provided landing gear designed to withstand harsh touchdowns without structural damage. The aluminum tail boom supported the distinctive shrouded tail rotor, while the composite cockpit provided weather protection and structural integrity.
This construction methodology prioritized durability and repairability, essential characteristics for aircraft intended for training operations and private ownership in potentially remote locations.
The Dynali Legacy
Dynali Helicopters SA originated in the early 1980s as a fixed-wing ultralight manufacturer under Jacques Tonet's leadership. The company initially achieved success with the Chickinox three-axis ultralight, completing over 1,000 examples before transitioning to rotorcraft as advanced materials like carbon fiber became available. This evolution from fixed-wing to rotorcraft manufacturing positioned Dynali uniquely in the light aircraft market.
The company relocated to larger premises in 2011 to accommodate expanded production, though the H-2 was eventually superseded by the H-3 in the mid-2010s. The H-3 represented a further evolution of Tonet's design philosophy, incorporating lessons learned from H-2 operations while meeting emerging Light Sport category requirements.
Operational Performance
In service, the H-2 demonstrated impressive capabilities for its size and weight class. With a maximum takeoff weight of 660 to 700 kilograms, the aircraft achieved cruise speeds between 165 and 175 kilometers per hour, with a never-exceed speed of 190 kilometers per hour. The 90-liter fuel capacity provided endurance ranging from 3 hours 15 minutes to 4 hours, depending on engine configuration and flight conditions.
The H-2's service ceiling of 3,658 meters and rate of climb exceeding 396 meters per minute enabled operations in challenging terrain and weather conditions. These performance figures, combined with relatively low operating costs, made the H-2 attractive for training operations and private ownership in markets previously dominated by more expensive conventional helicopters.