Extra EA-400
The Extra EA-400 is a six-seat, single-engined, high-wing monoplane produced by Extra Flugzeugbau GmbH. The EA-400 is powered by a liquid-cooled Continental Voyager turbocharged piston engine. Design and development. Started by Walter Extra, the company manufactures aerobatic airplanes almost exclusively, with their latest products being the Extra EA-300 series. This changed with the introduction of the EA-400, a cross-country pressurized airplane with many exclusive features including carbon fiber construction, cantilevered high wing, and a water-cooled Teledyne Continental TSIOL 550C engine. This exotic engine is simultaneously a great asset and a challenge for  the Extra 400: it is immune to shock cooling during descents, but troublesome and costly to operate, especially in hot climates. The airframe was designed with engineering help from the Technical University of Delft in Holland under leadership from Prof. Egbert Torenbeek and with contributions of Mr Loek Boermans for airfoil design. The aircraft's Fowler flaps feature a completely recessed mechanism and achieve a remarkable reduction of stall speed from 76 to 58 knots in landing configuration at maximum takeoff weight. The landing gear was designed and manufactured by Gomolzig in Germany. It is unusual in its geometry, very  strongly built, and completely sealed behind large carbon fiber doors once retracted. Its complexity requires knowledgeable maintenance personnel and also contributes to the aircraft's high operating costs. The optional weather radar pod is smoothly blended into the left wing tip. All Extra 400 aircraft have been retrofitted with the Flight Into Known Icing modification. Deicing equipment consists of Teflon boots, a heated prop, a heated pilot side windscreen, dual heated pitot tubes and static ports, and a heated stall sensor connected to the autopilot. The deicing equipment is powered by a pair of large alternators (100 and 85 amps ) that also feed the AC compressor located in the tail. The cockpit is unusually wide and comfortable with good forward and lateral visibility. Avionics are conventional with a full set of instruments for each of the two crew and a central stack. STCs for upgrades to modern GPS navigators and "glass cockpit" displays are available, but the only autopilot certified is the STEC 55X. An improved propeller with the "b" type blades is available from MT-Propeller under FAA Form 337 Major Modification. It increases climb performance and cruise speed. Time to climb to FL200 is 20 minutes and cruise  speed at 75% power ranges from 200 knots at 16'000 ft to a maximum of 220 knots at FL 250 (at MTOW and under ISA conditions). The passenger cabin is air-conditioned and offers four seats in a club arrangement with a folding table. It is much roomier than one would expect in this aircraft category and similar in size to that of the smaller jets such as the Eclipse 550. The single-skin pressurized vessel is very rigid, resulting in a relatively low level of noise and vibration in the cabin. The Extra 400 was very costly to manufacture , requiring 16'000 hours of labor, and carried a price tag of $1 million. Despite the aircraft's qualities, only 27 were built before the company ran into financial trouble.