In the world of corporate turboprops, 300 knots is something of a holy grail. Three hundred knots begins to intrude on jet country. Not many jetprops will manage such speed: the MU2, Cheyenne 400, Commander 1000 and perhaps one or two others.
Adding an STC’d conversion to the mix might seem like cheating, analogous to matching a full-race Porsche 935 against a group of stock 911s. Still, Darwin Conrad of Rocket Engineering (www.rocketengineering.com) in Spokane, Wash., has introduced a turbine-powered 58P Baron, and it does indeed nudge into the 300-knot club.