Piper Aircraft has taken a bold leap into the future of general aviation with the official unveiling of the Seminole DX, a revolutionary diesel-powered twin trainer designed to meet the evolving needs of flight schools and training operators around the globe.

By Jarryd Sinovich

Revealed ahead of EAA AirVenture 2025, the Seminole DX features the powerful new DeltaHawk DHK4A180 engine—an FAA-certified, 180-hp, turbocharged diesel engine that runs on Jet A and Jet A-1 fuels. Compared to traditional avgas engines, this next-gen powerhouse delivers:

• Up to 40% better fuel economy
• 35% lower fuel burn
• 32% increase in single-engine climb rate
• 70% higher single-engine absolute ceiling

“We heard the market loud and clear—the need for a sustainable, cost-efficient, heavy fuel multi-engine trainer is real. The Seminole DX delivers on that promise,” said Piper President & CEO John Calcagno.

Built for performance and planet, the aircraft supports Sustainable Aviation Fuel (SAF) and comes equipped with a modern liquid-cooled climate control system—ideal for training operations in diverse global environments.

The Seminole DX is the product of a landmark 20-year supply agreement between Piper and DeltaHawk Engines, which positions DeltaHawk as the exclusive heavy-fuel engine provider for the entire Seminole fleet. Both companies are now exploring expansion into other platforms like the PA-28 Archer and PA-46 M-Class.

📆 Certification flights begin November 2025, with FAA sign-off expected in Q3 2026 and first deliveries slated for early 2027.

📍 Position reservations open at EAA AirVenture Oshkosh 2025 (July 21–27) and global interest is already surging, especially among flight training institutions.

The Seminole DX isn’t just an upgrade. It’s a bold reimagining of what a modern training aircraft should be—efficient, powerful, and future-ready.