In 1971 the USAF began to put together the specification of a new transport as a possible replacement for its fleet of Lockheed C-130 Hercules aircraft. The Hercules design had originated from a specification of just 20 years earlier, and in putting together its requirement for this new transport, the USAF planners had in mind the very important development in powerplants and aerodynamics which had taken place since 1951. In early 1972 requests for proposals were sent out to nine US manufacturers, and those of the Boeing Company and McDonnell Douglas Corporation were selected for competitive evaluation under the respective designations YC-14 and YC-15.
Before the allocation of designations, the USAF specification had the identification AMST, signifying Advanced Military STOL Transport, and the emphasis required from the successful contenders was -concerned primarily with STOL (short take-off and landing) capability. The Boeing Model 953 design for STOL performance was based on the use of a supercritical wing, developed by NASA from the wind-tunnel research of Dr Richard Whitcomb, which provides highly efficient performance from the wing at high subsonic speeds. To this wing Boeing added an advanced wing upper-surface blowing concept, mounting the twin engines above the wing so that their efflux was exhausted over the wing. With the wing's leading-edge and Coanda-type trailing-edge flaps extended, the high-speed airflow from the engines tended to cling to the upper surface of the wing/flap system, and was thus directed downwards to provide powered lift.
The YC-14 first flew on 9 August 1976, and soon proved to have admirable performance. Maximum payload was 150 troops or 36,742kg of freight in conventional operations, while for STOL operations from an airfield of less than 572m the payload was still a useful 12,247kg.
At the completion of testing, in the late summer of 1977, the YC-14 prototype was returned to Boeing for continuing development, if the company so wished, but no further government funding for development or procurement was forthcoming.
| ENGINE||2 x GE CF 6-50D, 226.9kN|
| Take-off weight||97977 kg||216003 lb|
| Empty weight||54000 kg||119050 lb|
| Wingspan||39.3 m||129 ft 11 in|
| Length||40.1 m||132 ft 7 in|
| Height||14.7 m||48 ft 3 in|
| Wing area||163.7 m2||1762.05 sq ft|
| Cruise speed||750 km/h||466 mph|
| Range w/max.fuel||740 km||460 miles|
|Robert Sherman, 02.07.2013|
I was stationed at Langley AFB, VA from late '76 to '79. I saw the YC 14 preform in '77 or '78. Have awesome pictures from that display.
|Matthew Jochums, 06.05.2013|
I was wondering if anyone here knows the dimensions of the interior cargo hold for the bird? I can't find the information anywhere on the internet. If you could help me out, I greatly appreciate it.
|Greg Taft, 20.02.2013|
I was a Boeing Quality Assurance Inspector and worked on this aircraft as it was built in the Developmental Center in Seattle. It was a great engineering, planning, and manufacturing team effort that we all took great pride in being a part of. We enjoyed watching it being assembled and then we standing outside when it made its' first flight.
It was a great project and deserved better. The Carter Administration was one of the poorest ever.
|David Baker, 06.01.2012|
I was stationed at Edwards AFB during the AMST Program. Both the YC-14 and YC-15 aircraft were very capable, and we witnessed many test operations while the competition was in progress. The YC-14 was hangared adjacent to our building (Base Operations) and we included that hangar on our occasional tours we gave transient flight crews. Boeing didn't mind, as long as we let them know ahead of time. The YC-14 is deceptively large. If you view the aircraft from a distance, it looks comparatively small, but up close, it's huge. I sat in the cockpit of the YC-14, and it had some fairly normal instrumentation. I was impressed with the ergonomics of the cockpit design, and the visibility was outstanding. I remember the YC-15 heading to Yuma for testing, and the YC-14 being flown to AFMC Headquarters in Dayton, OH (Wright Patterson AFB)to be included in the Air Force Museum after the program was cancelled. The entire AMST effort was overshadowed by the Space Shuttle ALT Program, and hardly anyone noticed those funny looking cargo planes were gone.
|Lewis Godfrey, 02.08.2011|
Sometime during my assignment to Davis-Monthan AFB, AZ (Sep 1977 - Sep 1980), I watched both the YC-14 and YC-15 prototypes land to be prepped and put into the Boneyard
The flight demo was even more impressive than the "new" F-16 from GD. Jimmy Carter just couldn't shut down the Georgia based Lockheed C-130 line to buy this most impressive acft.
|Bob Macklin, 25.02.2011|
The problem along with Mr. Carter; the YC-14 was a two engine airplane and the Atlantic and Pacific were four engine oceans at that time.
|Don Beierwaltes, 27.12.2010|
I saw the YC14 and the YC15 during competition at Pope AFB and the YC14 out performed the 15.
|Richard Black, 22.12.2010|
Saw this impressive aircraft in the open air display area (75 acres) of the Pima Air & Space Museum in Tucson, AZ, loacted just outside Davis-Monthan AFB. (Tail No. 01873) The only way to get a true sense of its enormous size is to stand next to it. It is huge.
|Mike Garner, 25.11.2010|
I was on the test team for this aircraft from start to finish. The plane was the most awsome aircraft I ever flew on or had the oppurtunity to work on. Tsgt retired
|Boone Barnes, 08.08.2010|
Was a nav on C-141's and was part of a crew which accompanied the YC-14 to the Paris airshow. I was also a SME (subject matter expert)during the C-17 accuisition and made several trips to the McDonald Douglas plant in Long Beach from Hq MAC. The C-17 was a Douglas design and only became a Boing aircraft because Boing accuirered McDonald Douglas.
|Chuck Sweet, 25.03.2010|
This was a very impressive airplane, but the design process employed by Boeing to develop it was even more impressive. This prototype airplane, along with the YC-15 developed by Douglas Aircraft Corp, led directly to our fielding of the C-17 - which is one of our most effective military transports.
|william K. De Kine, 08.03.2010|
Took this and the 15 to mildenhall for the paris air show, great performer
|Jack Nisen, 08.02.2010|
Jimmy Carter put the program in the trash? What a jerk. Stick to peanut farming and pounding nails you fool.
|PLANE FAN, 20.04.2009|
From the intro..In early 1972 requests for proposals were sent out to nine US manufacturers,... Who whould the other 7 manufactures have been at that time?
|Eric Bishop, 10.03.2009|
I have seen the yc14 in the arizonia desert and wow is she big for her size.
|Paul Bacon, 01.07.2008|
If you like this one, go check out the Russian Antonov AN-72 - it's a knock-off of the YC-14 with an interesting design history.
|Jim Johnson, 12.06.2008|
I escorted this acft from Edwards to a few U.S. stops then on to England. The flight demo was even more impressive than the "new" F-16 from GD. Jimmy Carter just couldn't shut down the Georgia based Lockheed C-130 line to buy this most impressive acft.
|Fred Faust, 18.08.2007|
This test aircraft can be seen at the Pima Air and Space Museum in Tucson, AZ. Check their web site for a photo.
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