Ampaire, a tech startup based in California, announces, “Our mission is to be the world’s most trusted developer of practical, compelling electric aircraft from short-haul cargo to supersonic passenger transport.” They also claim to have demonstrated the “highest-capacity electric aircraft ever flown” last Thursday, June 5th at Camarillo, California. The company hopes to “have regular commercial service for passengers and cargo as soon as 2021.” Using a Cessna 337 Skymaster was a canny move for the young firm, giving them ample weight-carrying ability to have a petrol engine in the nose and a dual-Emrax motor system behind the cabin and between the twin tail booms. The push-pull arrangement adds to engine-out safety with no assymetrical thrust as on a conventional light twin. The Skymaster’s six-passenger cabin will enable profitable flights for charter work. A standard 337 has an empty weight of 2,655 pounds and a payload of 1,745 pounds for a gross weight of 4,400 pounds. With four to six …