GRAHAM WARWICK / WASHINGTON DC
FASTec to modify all-composite two-seater DynAero kitplane to electric power
Plans to fly an electric-powered light aircraft at next year's Sun 'n' Fun show in Florida have been unveiled by an educational foundation that hopes to use the project to stimulate student interest in the technology. American Ghiles Aircraft has donated a DynAero Lafayette 3 kitplane for modification to electric power.
The Foundation for Advancing Science and Technology Education (FASTec) plans to modify the all-composite two-seater in three phases. In the first phase, the piston engine will be replaced with a 40kW (65hp) electric motor, powered by 150kg (330lb) of advanced lithium-ion batteries mounted in the wing and fuselage.
The Selectria motor can produce over 100kW for short periods, enough power for take-off, says Worcester, Massachusetts-based FASTec. SAFT batteries will provide 21kWh of total energy, says executive director Jim Dunn, enough to provide 160km (100 miles) range at a cruise speed of 70-75kt (130-135km/h) with a single pilot.
In the second phase, one-third of the batteries will be removed and replaced with a 12kW hydrogen fuel cell. Batteries will be retained to provide a surge capability for take-off, while the fuel cell will provide sufficient power for the cruise and a 400km range. The aircraft is scheduled to fly in this configuration in August 2002.
Also in the second phase, an Extreme motor glider donated byDiamond Aircraft will be converted to hybrid gasoline and electric power, combining a small piston engine for take-off with a fuel-cell electric motor for silent propulsion once in flight.
In the third phase, a more powerful fuel cell will be installed in the Lafayette, providing enough power for take-off, climb and cruise with an 800km range, says Dunn. Sufficient batteries will be retained to provide initial acceleration and 100km reserve capability in case the fuel cell fails or has to be turned off for safety reasons, says Dunn. The aircraft is scheduled to fly in this configuration in August 2004.
Fuel cells work by generating hydrogen then combining it with oxygen to produce electricity. The advanced fuel cells FASTec plans to use are already under development for NASA's Helios electric-powered ultra-long-endurance unmanned air vehicle. FASTec is seeking more sponsors for the project.
Source: Flight International
