波音YC-14 | |
|---|---|
| 国家 | 美国 |
| 作用 | 战术运输车 |
| 首次飞行 | 9 八月 1976 |
| 建立 | 2 |
这 波音YC-14 是一种双喷气短距起降（STOL）战术军用运输机。这是波音公司参加美国空军先进中型短距起降运输（AMST）竞赛的参赛者，该竞赛旨在取代洛克希德C-130大力神，成为美国空军的标准短距起降战术运输机
源： 维基上的波音YC-14
| Boeing YC-14 Walk Around | |
|---|---|
| 摄影师 | 弗拉基米尔·亚库博夫 |
| 本地化 | 皮马航空航天博物馆，亚利桑那州塔斯康 |
| 照片 | 152 |
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A Vision of the Future (That Almost Was)
这 波音YC-14 was an experimental short takeoff and landing (STOL) tactical transport built for the USAF’s Advanced Medium STOL Transport (AMST) program in the 1970s. Designed to replace the C-130 Hercules, it featured a radical look dominated by two massive engines perched on top of the wings. While it shattered performance expectations—landing at speeds as low as 59 knots—it never entered production due to shifting military priorities. However, its “supercritical” wing design and digital flight systems became the DNA for the modern C-17 Globemaster III.
| Attribute | Standard Specification (Boeing YC-14) |
|---|---|
| 作用 | Tactical STOL Transport (Prototype) |
| 船员 | 3 (Pilot, Co-pilot, Flight Engineer) |
| 能力 | 150 Troops or 36,700 kg (81,000 lbs) of Cargo |
| 动力装置 | 2 × General Electric CF6-50D turbofans |
| Thrust | 51,000 lbf (227 kN) per engine |
| STOL Takeoff Run | Approx. 300 meters (1,000 ft) |
| Cruising Speed | 723 km/h (449 mph / 390 knots) |
| Service Ceiling | 13,716 meters (45,000 ft) |
The Magic of “Upper Surface Blowing”
- The Coanda Effect: The YC-14’s most famous feature was Upper Surface Blowing (USB). By placing the engines above and forward of the wing, the exhaust was forced to flow over the top of the wing and “stick” to the giant curved flaps when they were lowered. This effectively “bent” the thrust downward, creating massive amounts of extra lift.
- FOD Protection: Mounting engines on top of the wings wasn’t just for lift; it protected them from Foreign Object Damage (FOD), allowing the plane to operate safely from unpaved, gravel, or dirt runways where a low-slung engine would suck up debris.
- Supercritical Wing: The YC-14 was one of the first large aircraft to use a supercritical wing profile, which allowed it to fly closer to the speed of sound without the massive drag penalty usually associated with straight-wing cargo planes.
- Stability at Low Speeds: To keep the plane controllable at 60 mph, Boeing used a sophisticated digital flight control system—a precursor to modern “fly-by-wire” technology.
The AMST Competition & Legacy
- The Rivalry: The YC-14 competed head-to-head with the McDonnell Douglas YC-15. While the YC-15 used a more “conventional” four-engine setup with blown flaps, the YC-14 was considered the more technologically daring of the two.
- Heavy Lifter: In tests, the YC-14 proved it could carry the 109,200 lb M60 Patton tank, a feat the C-130 of the time couldn’t dream of.
- The Boneyard: Only two were ever built. One currently rests at the Pima Air & Space Museum in Arizona, while the second is in long-term storage at the Davis-Monthan “Boneyard.”
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