AltoVolo Sigma eVTOL Aircraft

Yet another startup, London-based AltoVolo, is showing off its vision for an eVTOL aircraft, and it's one of the boldest — and sleekest — yet. Dubbed the Sigma, it's powered by a hybrid-electric tilting jet propulsion system that relies on the instant power of batteries for takeoff and landing and liquid fuel for range. As a result, it's projected for a range of 510 miles and a cruising speed of 220 mph, with a 290 mph top speed. Equally impressive are its measurements, as it's just 15.7 feet wide and weighs just 2,160 lbs (with three passengers inside). AltoVolo says that scale prototype flight testing is already complete with progress being made on a full-scale demonstrator; no production date has yet been announced.

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