The Zunum aircraft under development, internally dubbed the ZA10, is the first in the company's family of regional, hybrid-to-electric aircraft. It will be powered by dual power sources: propulsion batteries, and a Safran turboshaft from the 1,700 to 2,000 shaft horsepower (shp) Ardiden range.
This new model, the Ardiden 3Z, will be used as a hybrid power source achieving demanding cost, efficiency and uptime requirements. It will be coupled with an electric generator, and the integrated turbo-generator will deliver 500kW of electric power to supplement the battery packs on key stages of flight and over long ranges. Upgrades such as advanced materials and integrated lifecycle management for hybrid service will dramatically reduce operating costs of the engine by extending the life of critical components.
The new aircraft will deliver breakthrough operating costs of 8 cents per available seat mile or $250 per hour for the aircraft, which is 60-80 percent lower than comparable conventional aircraft of comparable size. The ZA10 aircraft is designed to cruise and land on turbo-generator power alone, offering full redundancy.
Zunum's selection of Safran is a critical step towards realizing the delivery of an economical, efficient hybrid-to-electric aircraft by the early 2020s. Because a key element of the MW-class hybrid-to-electric powertrain is a 500kW capable gas turbine that is compact, lightweight and highly efficient, to complement the propulsion batteries onboard, Safran's proven expertise made the partnership a natural decision.
"Today marks a significant milestone on the path to delivery of the ZA10," said Matt Knapp, co-founder and CTO of Zunum Aero. "The Zunum ZA10 aircraft will bring breakthrough performance to regional aviation, paving the way to fast, electrified, affordable high-speed air services to communities everywhere."
Florent Chauvancy, Safran Helicopter Engines EVP OEM Sales, added: "The Ardiden 3Z represents a very powerful complement to the ZA10 because of its exceptional performance, along with low operating and maintenance costs. This announcement marks a new step forward in demonstrating Safran ability to offer hybrid propulsive solutions for tomorrow's mobility solutions."
From ground testing to flying testbed and beyond
Near-term milestones include ground and flight testing scheduled for 2019, as well delivery of the ZA10 aircraft targeted for the early 2020s.
Zunum selected a Rockwell Turbo Commander 840 to modify for the flying testbed aircraft. The Rockwell Turbo Commander 840 has similar weight and performance to the ZA10, as well as excellent single-engine capability, enabling Zunum to modify and test in phases for a high-degree of safety.
In preparation for flight in 2019, Zunum Aero conducted ground tests of the hybrid-electric power system at Chicago-area facilities earlier this year. Through Q4 2018 and early 2019, the power system will continue to be upgraded and tested in stages to advance it for flight. Meanwhile, the Ardiden 3Z engine will undergo ground tests in France and US, ahead of integration with the flying testbed in 2019.
Modifications of the test aircraft began on schedule for a series of flights in the back half of 2019 leading to full hybrid-to-electric conversion with the Safran engine. The flying testbed will continue to be upgraded with successive prototypes until start of certification in 2020-21.