The genesis of the GT50 wasn't just ambition, it was necessity. When designing the HX50, Jason Hill explored every existing powertrain option, from established giants like Lycoming and Continental to diesel technology and even automotive conversions. The result was always a compromise:

• Performance vs. Price: Existing turbines offered the performance but came with an exorbitant price tag that killed the business case for a truly accessible helicopter.
• Refinement vs. Reality: Cheaper piston engines lacked the refinement and power-to-weight ratio required for a luxury experience.

To break this cycle, Hill Helicopters had to control the single biggest cost driver in the aircraft: the engine.

The GT50 is not an overnight experiment. It is the culmination of a decade and a half of relentless development.

• 2008–2016: The "Is it possible?" phase. Years spent validating the core architecture and manufacturing processes.
• 2016–Present: The intensive development phase. Moving from theory to design, and finally, to the manufacturing of physical components.

This timeline reflects a commitment to doing it right, not just doing it fast. As Jason notes, "It’s like a marathon... and now we're in that last sprint."

Reinventing Manufacturing: Why We Make Every Part

Perhaps the most daunting aspect of the GT50 programme is that Hill Helicopters isn't just designing an engine, we are manufacturing it. Relying on the traditional aerospace supply chain would have reintroduced the high costs we sought to eliminate.

Instead, the team had to master complex processes internally, including:

• Turbine Blade Casting: Developing the capability to cast, heat-treat, and grind complex superalloy blades.
• Combustor Fabrication: Turning flat sheets of metal into precision-engineered combustion chambers through rolling, welding, and laser drilling.
• Precision Balancing: Learning to balance rotor assemblies spinning at 50,000 RPM with over 100 individual components.

The GT50 is being brought to life by a team that Jason describes as "beyond world-class." It is a unique blend of two distinct groups:

1. The Veterans: Engineers with 40+ years of experience who worked on the last great generation of engines in the 1980s. They carry the "lost knowledge" of the industry.
2. The Modern Innovators: Young, dynamic engineers who apply cutting-edge CAD, CFD, and analysis tools to that foundational knowledge.

This combination allows Hill to move with the speed of a startup but the wisdom of a legacy manufacturer.

As the first gas generator moves through final assembly and the test rigs are prepared, the atmosphere at Production Centre One is electric. Jason compares it to "exam week", a mix of excitement, pride, and healthy nerves.

The upcoming testing roadmap is disciplined and methodical:

• Dry Crank: Spinning the engine without fuel to check mechanical integrity.
• First Ignition: The historic moment the engine lights off for the first time.
• Self-Sustain: Running under its own power without the starter.
• Tuning & Mapping: Optimising the compressor and turbine relationship across the speed range.

When the GT50 roars to life, it will be more than just a technical milestone. It will be the proof point for General Aviation 2.0.

By proving we can manufacture a modern jet engine at a fraction of the traditional cost, we underpin the entire value proposition of the HX50. It enables:

• Lower Purchase Price: Making the helicopter accessible to private owners.
• Sustainable Operating Costs: Allowing commercial operators to see healthy margins again.
• A New Era: Proving that physics and determination can overcome industry stagnation.