On Wednesday 15th May, as competition within the rotorcraft sector heats up, Airbus Helicopters showcased an experimental half-plane, half-helicopter. First announced in 2017, Airbus’s experimental aircraft made its first flight in Marseille, hitting the aerospace giant’s performance and sustainability targets.
Image: Airbus
The 200 million euro ($217 million) Racer is a one-off demonstrator model combining traditional overhead rotors with two forward-facing propellors in a bid to combine stability and speed, shortening response times for critical missions like search-and-rescue.
Capable of a top speed of 249 mph, the experimental Racer has a 20 percent lower fuel burn than helicopters flying 50 mph slower. Could it be the future of helicopters?
Image: Airbus
Sustainability and Speed Together
“The aim of the Racer is not to go as fast as possible,” said Julien Guitton, who heads up the program, in a statement. “We wanted to offer enhanced operational capabilities at the right price for missions where speed can really be an asset.”
In other words: Speed is important, but not the most important feature. Clients want a fast helicopter, but “speed at any price,” says Guitton, is “of no interest to anyone.”
The Racer was launched as part of Europe’s Clean Sky 2 program which, along with Airbus, involved 40 partner companies from 13 European countries. The project began with a very ambitious goal of achieving a 20 percent reduction in fuel consumption and CO2 emissions, compared with a conventional helicopter of the same weight. The design team also wanted the Racer to have a significant reduction in its noise and vibration.
To achieve this, the designers created what they call a “compound” design, which involved an unusual combination of a helicopter rotor, fixed wings, an aerodynamic fuselage, and rear-racing propellers. The Racer also has hybrid propulsion along with a custom engine management system and autopilot.
Best Flight Performance Assured
Using the engine management system lifts propulsion to its most efficient output for both speed and fuel burn, while the autopilot coordinates the Racer’s diverse features to assure its best flight performance. The aircraft went through multiple simulations, and in April, the first flight tests were held to see if the prototype met the design’s initial performance and efficiency goals. It did.
Image: Airbus
Airbus said the configuration delivered 20 percent less fuel burn per nautical mile at 180 knots (207.14 mph) compared to a conventional helicopter at 130 knots (149.6 mph).
Besides all the different exterior pieces working together, the Racer’s Safran Eco-Mode hybrid-electric system essentially puts one of its two Aneto-1X engines on hold while the whirlybird is in cruise mode. “It has the ability to restart it almost instantaneously if necessary,” says Guitton. “The aircraft flies slightly slower than it would with both engines running, but it’s still faster than a conventional helicopter.”
Image: Airbus
That generates fuel savings of up to 20 percent. The Racer has a potential top speed of 248.5 mph, slower than the 293-mph top speed of the Eurocopter X3, the experimental aircraft it was based on. But the Racer’s fuel efficiency more than makes up for the lower speed. It’s still fast—about 100 mph faster than Airbus’s top executive helicopter, the ACH160.
Boeing’s V-22 Osprey uses tilting rotors, as does Leonardo’s AW609, though they both look more like conventional aircraft than a helicopter. Many new eVTOL designs also combine fixed wings and tilting rotors to allow vertical takeoff and landings as well as efficient forward flight.
The Racer’s wings are optimised for all phases of flight, thanks to flaps on the trailing edge. The wings also take 40 percent of the load off the rotor to reduce vibration which, says Guitton, will make it more comfortable than most other helicopters.
