The TG-R90 is an onboard regenerative turbogenerator for hybrid-electric aircraft and eVTOL architectures. It delivers 85 kW of continuous electrical power and weighs 64 kg without ancillary equipment, supplying energy to propulsion systems.
The TG-R90 is a regenerative turbogenerator from Turbotech, an onboard electrical generator set built around a gas turbine for hybrid-electric aircraft. It produces electrical power in flight so that batteries are recharged and electric propulsion can be supported over longer ranges than a battery-only aircraft allows.
The maker presents the unit as a power source for hybrid-electric planes and hybrid eVTOL architectures. Used with batteries, it can offer up to 10 times more range than a fully electric aircraft, according to the maker. The turbogenerator is described as multi-fuel, running on Jet-A1, diesel, UL91, AVGAS, bio-fuel and hydrogen, and as ultra quiet and ultra light.
The key figures are these. Continuous electrical power is 85 kW, and the weight without equipment is 64 kg. The voltage at the inverter output for full power is 630 V to 800 V DC, which sets the bus voltage of the propulsion system the unit has to match. The time between overhauls is 3,000 hours. Turbotech's comparison table also lists the TG-R55 at 55 kW and 55 kg, so the TG-R90 is the larger of its two turbogenerators. The engine is regenerative, with a heat exchanger that recovers energy from the exhaust gases to reduce fuel consumption, a principle the maker also applies in its turboprop.
For integration, the maker calls the unit all-in-one and plug-and-play for hybrid aircraft architectures. It outputs high-voltage DC through its inverter, so the aircraft needs a compatible DC bus, battery management and power distribution for 630 V to 800 V. As the 64 kg weight excludes equipment, ancillaries such as fuel system, cooling and inlet and exhaust ducting must be added to the mass budget by the integrator.
No certification or standard is stated for the TG-R90 in the source consulted. Typical applications are hybrid-electric fixed-wing aircraft and hybrid eVTOL or hybrid VTOL airframes that need an onboard range extender, with batteries covering peak power for takeoff and landing while the turbogenerator supplies cruise power and recharges the pack in flight.
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