expected to deliver benefits. Maintenance schedules haven’t been established for electric


motors and hydrogen fuel cells. But most of the systems’ inspection and refurbishment will be “more than an order of magnitude less demanding than with a turbine engine,” John Piasecki says. Some analysts predict that inspec- tion intervals with hydrogen propulsion will rise from 2,500 hours in the beginning to as long as 20,000 hours when the technology is fully mature and tested.


“Aviation is the killer app for hydrogen. It’s the most energetic propellant outside of nuclear fuels.”


– Paul Eremenko, CEO, Universal Hydrogen


The CoAX 2D Coaxial Ultralight As the company develops the PA-890, Piasecki is also working with the FAA on defining airworthiness certification criteria for hydrogen fuel cells. HyPoint will deliver five full-scale, 650 KWh hydrogen fuel cell systems for ground tests, flight testing, and for use in certification efforts. Piasecki Aircraft says it’s working on FAA certification criteria for the hydrogen fuel cell–powered PA-890 by 2023. “Our main challenge will be in maturing the hydrogen


fuel cell through a rigorous development program to educate ourselves and the FAA, using lessons learned to inform certification criteria, and developing a conforming design to take into production,” John says. Te firm plans to use the CoAX 2D coaxial ultralight helicopter from German developer edm aerotec GmbH as a test bed for a proof-of- concept demonstration of a scaled HTPEM hydrogen fuel cell. Piasecki aims to complete the first crewed helicopter flight powered by a hydrogen fuel cell with


the CoAX 2D in 2023. Te CoAX 2D sports two counter-rotating rotors on a


common shaft that counteract each other’s torque, providing highly efficient hover performance and eliminating the need for a tail rotor. Te two-passenger helicopter weighs 1,320 lb., is powered by a 125 hp engine, and is certified by German airworthiness authorities as a light sport aircraft. Te HTPEM hydrogen fuel cell demonstrated on the CoAX 2D will reduce the risk for scaling up the technology


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