Vertical Aerospace releases new VX4 prototype, begins initial testing

Vertical Aerospace (London, U.K.) has unveiled its next-generation, full-scale VX4 prototype, claimed to be the only electric takeoff and landing (eVTOL) vehicle designed, built and assembled in the U.K. The company has started with initial powered ground tests, including propeller balancing, which have been successfully completed.

The VX4 is reported to be more powerful than the previous full-scale prototype, with a 20% increase in power-to-weight ratio, enabling the aircraft to reach speeds of up to 150 miles per hour. The aircraft has been designed and built alongside global aerospace partners, including GKN Aerospace (composite wings and empennages and wiring harness), Honeywell (flight control computers, avionics and flight control software), Hanwha (electro-mechanical actuators and mechanisms), Molicel (lithium-ion cylindrical cells for the battery cell), Leonardo (composite fuselage and pylons) and Syensqo (composite materials). It also features carbon fiber propellers and proprietary battery technology, designed and manufactured at its Vertical Energy Centre (VEC) near Bristol.

The VX4 prototype has successfully completed systems and aircraft testing and commissioning. Vertical is now working closely with the UK Civil Aviation Authority (CAA) as it rigorously evaluates the engineering, design, test data and aircraft ahead of issuing a Permit to Fly, effectively conducting a “mini certification” program. Vertical will then begin a robust flight test program at the VEC, with a focus on achieving piloted flight.  

Vertical is currently developing an identical full-scale prototype which will accelerate the VX4’s flight test program and demonstration capability. The company will take flight test learnings from both prototypes into the design and development of the certified VX4 model.

Over the coming days, the company will conduct powered, propulsion system testing of its powertrain, which includes proprietary battery packs capable of producing 1.4 megawatts of peak power. The company will then move onto its “wheels up” phase with tethered flight tests before progressing to low-speed untethered flights, once it has been issued its Permit to Fly. Together, they will ensure the VX4 meets the highest standards of operational safety which are needed for piloted flights.

“These tests are a crucial step forward in our mission to certify the VX4 and make a cleaner, quieter and safer way of air mobility a reality,” says David King, chief engineer at Vertical, says. “Every day we are seeing progress from the team at our Flight Test Centre, each test providing valuable insights to help shape the next.”