Boeing YC-14 Prototype STOL Aircraft
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Of the initial proposals from several aircraft manufacturers, two were green lighted for further development, and both Boeing and McDonnell Douglas received contracts for two prototypes each. The Boeing aircraft was called the YC-14, while the McDonnell Douglas aircraft was designated the YC-15.
The Boeing YC-14 first flew on 9 August 1976, almost a year after the McDonnell Douglas YC-15 had first taken to the air. By November ’76 the two aircraft began a series of head-to-head tests at Edwards Air Force Base. During flight testing, the YC-14 was flown at speeds as low as 59 knots (67 mph) and as high as 38,000 feet (11,500 m). During the initial flights it was discovered that the YC-14′s drag was 11% higher than originally predicted. However after several minor modifications this was reduced to 7%. The YC-14 also managed to carry the 109,200 lb (49,500 kg) M60 Patton main battle tank. something that was not attempted with the competing YC-15.
Both prototypes of the Boeing YC-14 survive. Aircraft serial number 72-1873 is on display at the Pima Air & Space Museum in Tucson, Arizona. While the other is in storage at Davis Monthan Air Force Base. [via]
