If you guessed the Ball-Bartoe JW-1 Jetwing, then you would be correct! I recently visited the “Wings Over the Rockies Air & Space Musuem” where this aircraft was on display.
It was a US research aircraft designed by Otto E. “Pete” Bartoe in the 1970s to investigate “blown wing” technology. Bartoe reasoned that if jet engine air could be ducted and blown over the wing, the increased airflow would increase lift which would allow for smaller wings enabling higher speeds. A “blown wing” could also fly slow enough (thanks to increased lift) to operate from unimproved runways and aircraft carriers.
The aircraft is a small mid-wing design powered by a Pratt & Whitney turbofan and fitted with a conventional landing gear. Engine air is exhausted just outside the fuselage through slots in the top skins of both wings and directed aft by vanes in a duct through slots on the leading edges. (About 70% of the wingspan was bathed from the engine’s fan stage discharge air.) Mounted above the main wing was an small “augmentor” wing; exhaust gases passed through the slot between the two wings which caused the lower pressure in the slot to draw in more air which increased lift. At the trailing edge, large flaps rotated and extended up to 52 degrees. They remained in contact with the top skin and made use of the Coanda effect, in which airflow bends to follow a curved surface. With the flaps down, the “bend” in the airstream provided downward thrust and enabled the Jetwing to fly as slow as 40 mph (64 km/h).
The Jetwing first flew in 1977, at Mojave, California, with Lockheed test pilot Harold “Fish” Salmon at the controls. The blown-wing configuration generated more than twice the lift of a conventional wing of the same area. The Jetwing flew slowly enough that Bartoe could use his Super Cub as a chase plane.
|Specifications Bell Bartoe JW-1 Jetwing
• Crew: 1
• Length: 29 ft 0 in (8.84 m)
• Wingspan: 21 ft 9 in (6.63 m)
• Wing area: 105 ft2 (9.8 m2)
• Empty weight: 2,500 lb (1,134 kg)
• Gross weight: 3,336 lb (1,513 kg)
• Powerplant: 1 × Pratt & Whitney JT15D-1 turbofan, 2,200 lbf (9.8 kN)
• Fuel Capacity: 106-gallons, 41 minutes endurance
• Maximum speed: 400 (347 Kt) mph (644 km/h)
• Minimum speed: 40 mph (64 km/h).
• Range: 120 nmi (220 km) miles ( km)