AltoVolo gets a prototype of its spicy high-performance eVTOL in the air

AltoVolo, a UK-based company, has flown a 1:4 scale prototype of its Sigma eVTOL aircraft. This comes a year after the company first shared its vision for a high-performance electric vertical takeoff and landing vehicle. The prototype shows significant design changes from the initial concept.

Sigma's New Design and Performance Goals

The Sigma prototype has a new look compared to the 2025 concept. It aims for a 500-mile (804 km) range and a top speed of 220 mph (354 km/h). This speed would make it one of the fastest eVTOLs available in the coming years. For comparison, Joby Aviation's five-seater eVTOL flies at 200 mph (322 km/h).

The updated Sigma now seats two people instead of three. This change means pilots with a Sport Pilot certificate can fly it with a passenger after only 25 hours of training. This makes the aircraft more accessible for various uses.

The Sigma now seats two instead of three, so Sport Pilots can legally fly with a passenger after just 25 hours of training. Image: AltoVolo

Another key change is the switch from closed electric ducted fans to open rotors for takeoff and cruising. AltoVolo states this design offers double the hover time, faster propeller loading, and weight savings. The company also developed its own fixed-pitch propeller for the vehicle.

The 1:4 scale Sigma prototype during a test flight. Image: AltoVolo

Next Steps for AltoVolo

AltoVolo has completed the preliminary design review and testing of this scaled-down prototype. The next phase involves building a full-scale Sigma demonstrator. This larger version will undergo rigorous testing to validate its design and engineering.

After the full-scale demonstrator, the company will need to pass transition flight tests and meet aviation certification requirements. They will also need to set up their manufacturing process before the Sigma can be delivered to customers.

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