Marc Cook reviews the new twin-turbo Velocity TXL from Velocity Aircraft. Among the benefits of the new configuration, which includes two Garrett turbochargers on the Continental engine, is power that keeps performance consistent well into higher altitudes-to the tune of 250 knots at FL250.
Everything old is new again. Paul Lamar looks at the turbo-compound engine, developed in the post-WW-II era. Thrown over for jet engines, it may yet hold promise today as we search for more energy efficient ways to get the most out of increasingly expensive fuel.