National Geographic : 1981 Jan
Instruments . One step beyond a carpenter's level, a Gyroscopicartificial Flight directors on today's skid/slip indicator horizon, new in 1929, jetliners help apilot maintain Future electronic attitude and command of the 1920s showed permitted true blind flight phases such as cruising, displays can instantly give the pilot balanced flight when flight. This one from the as well as showing him his current more flight data, yet the ball level, at ball was centered. 1940s shows aleft turn. attitude. bottom, will still have its place. Wright Flyer I of wood, wire, and fabric used twin wings, rudders, and propellers, as well as a canard-a forward epitch control. Louis Bldriot's Type XI used asingle wing, box girder fuselage, control column, and rudder bar. In1909 Bldriot was first to fly the English Channel, apreview of the practical uses of the airplane. c engines, the Pratt & Whitney Aircraft 157 turbojet generated 19,600 pounds of thrust with an afterburner and powered airplanes A huge fan propels airof the 1950s. rearward to increase thrust and efficiency of Pratt & Whitney Aircraft JT9D turbofan jet engines. At 50,000 poundsoftrseah fou ar needt power The Evolution of the the Boeing 747 jumbo jet.