The script that controls the battery charge of the prototype of a promising single electric tiltrotor Heaviside, the development of which involved an American company Kitty Hawk, was the cause of the hard landing during flight test in October last year. To such conclusion as writes eVTOL, came to specialists of the National Committee for transport safety of the USA. In flight, the script took on too much computing resources on-Board equipment Heaviside, with the result that the machine almost stopped listening to control commands.
Electric tiltrotor Heaviside made the first flight in early October, 2019. The device is made of aircraft scheme with canards. Convertiplane equipped with eight electric motors, six of which are located on the wing and two winglets on the canard. Pusher propellers on the motors is a rotary — their shafts may deviate down 90 degrees, creating a lifting force.
Wingspan Heaviside is 6.1 meters. The machine is capable of vertical takeoff and landing and flight in hover mode. The range of the tiltrotor is estimated at 160 kilometers, and a speed of about 250 kilometers per hour.
In mid-October 2019 during a test flight in an unmanned mode, held at a private farm in Tres Pinos in California, the tiltrotor Heaviside made a hard landing on the field at the speed of 37 knots (68.5 km / h) with a dive in 20 degree and 20-degree list to port. As a result of rigid landing the machine has received serious damages — the nose of the tiltrotor came off from the fuselage together with the cockpit.
During the flight, the operator of ground control station has detected that exceeded a lot of tolerance in onboard computer Heaviside. This operator reported the exceedances to the operator control, which controlled the flight of the convertiplane. The translated Heaviside in manual mode and took him up to the landing, but soon discovered that the device practically does not obey the control commands. Then the rotor osprey made a hard landing. The total duration of this test flight was 10 minutes.
Following the investigation, the experts came to the conclusion that the cause of the hard landing was the script that controls the battery charge and improper completion by the operator before the flight test. Script — the script — runs the operator on the ground when the device is put on charging. After the completion of battery charge and before the flight the operator should the script terminate what has been done with errors.
In flight is not completed, the script started to throw errors battery power and thus gradually took to suit your needs much of the resources of the onboard computer of the tiltrotor. Currently, Kitty Hawk is developing a new software for Heaviside in which intends to fix the timings and the procedure of the software of the onboard computer to separate the incomplete and unimportant for flight processes could not take to suit your needs significant resources.
In early February, 2020 American company Wisk, a joint venture of Boeing and Kitty Hawk, has announced its intention to test a promising electric Cora air taxi transportation of passengers. During the test, the air taxi will fly in fully Autonomous mode, under the supervision of the operator standing on the ground. Inspections will be scheduled in the Canterbury district in the Central part of new Zealand’s South island. The tests will be multiple flight models Cora.