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Aviation History
1949
1949 - 0107.PDF
January 2,0th, 1949 71 O F the five high-speed research air-craft depicted (four American, one British) three have already achieved supersonic flight, but only one—the rocket-propelled Bell X-l— has ac- complished this in level flight. The X-1 (C) Is air-launched and is unofficially credited with a. Mach Number of 1.4— a figure which may be far exceeded in the immediate future. In the Douglas Skyrocket (E) both a rocket and a turbojet are fitted, but the circum- stances under which this type lately reached " Mach I plus " are not yet known. It represents a notable aero- dynamic advance on the turbojet Sky- streak (B). The Northrop X-4 (A) has only lately made its first flight and is powered with two turbojeu with afterburners. Our own de Havilland 108 (D) Is remarkable in having attained level speeds of the order -of 630 m.p.h. on the relatively low thrust of a Goblin (output unspecified), and for its low wing loading and amazing handling : qualities. In the hands of Mr. John ! Derry the " 108" has exceeded a Mach Number of 1.0 in a dive. SOUND INVESTMENTS
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