Congrats to @billythalheimer, @mikeklinker1, and @regentcraft (W21) on their $240M Series B! They build seagliders, electric craft that skim just above the water and combine the speed of an aircraft with the convenience of a boat. Their Viceroy Seaglider prototype is designed to carry 12 passengers at up to 180 mph, and its first human flight is imminent. Regent’s commercial order book spans six continents, and production is starting at their newly completed 255,000-square-foot factory in…