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XV-11
Role STOL research aircraft
National origin United States of America
Manufacturer Mississippi State University
First flight 1966
Number built 1

The Mississippi State University XV-11A Marvel was an experimental American STOL research aircraft of the 1960s. It was a single-engined pusher monoplane fitted with a boundary layer control system. It carried out its initial programme of research on behalf of the US Army in the late 1960s, and was rebuilt in the 1980s as a proof-of-concept for a utility aircraft.

Contents

Development and design

The Department of Astrophysics and Aerospace Engineering at the Mississippi State University had been involved in a programme of research into boundary layer control on behalf of the Office of Naval Research and the US Army since the early 1950s, carrying out trials on a modified Schweizer TG-3 glider, a Piper L-21 and a Cessna O-1.[1][2] Based on the results of these studies, the US Army awarded the Department a contract to develop a new STOL research aircraft the XV-11 MARVEL ("Mississippi Aerophysics Research Vehicle, Extended Latitude").[3]

The resultant design was a shoulder-winged monoplane powered by a single Allison T63 turboprop engine driving a pusher ducted propeller. The boundary layer control system used a blower driven by the engine to draw suction through more than one million tiny holes in the wings and fuselage, while instead of conventional flaps the Marvel used a form of wing warping to deflect the wing trailing edges to vary the wing's camber.[1]

The aircraft's wing and ducted propeller were tested on a piston engined tested, the XAZ-1 "Marvellette". The full sized Marvel was built by the Parsons Corporation based at Traverse City, Michigan, being completed in 1966.[1] It successfully completed a 100 hour flying programme for the US Army in 1970, and was then stored.[3][2]

The Marvel was brought out of storage as a proof-of-concept demonstator of a STOL utility aircraft for Saudi Arabia.It was fitted with a more powerful (420 hp (313 kW)) engine and longer span wings, first flying in this form as the Marvel II on 17 August 1982, and carried out a further trials programme.[3]

Specifications (XV-11A)

Data from Jane's All The World's Aircraft 1969-70 [1]

General characteristics

  • Crew: 2
  • Length: 23 ft 3.75 in (7.1057 m)
  • Wingspan: 26 ft 2.5 in (7.988 m)
  • Height: 8 ft 8.25 in (2.6479 m)
  • Wing area: 106 sq ft (9.8 m2)
  • Aspect ratio: 6.48
  • Airfoil: NACA 63615 (modified)
  • Empty weight: 1,958 lb (888 kg)
  • Max takeoff weight: 2,620 lb (1,188 kg)
  • Powerplant: 1 × Allison T63-A-5A turboprop, 316 hp (236 kW)
  • Propellers: single blade Aeroproducts Model 272 two-bladed shrouded propeller, 5 ft 6 in (1.68 m) diameter

Performance

  • Maximum speed: 225 mph (362 km/h; 196 kn) at 15,000 ft (4,570 m)
  • Cruise speed: 184 mph (160 kn; 296 km/h) range cruise at 15,000 ft (4,570m)
  • Stall speed: 60 mph (52 kn; 97 km/h)
  • Never exceed speed: 287 mph (249 kn; 462 km/h)
  • Range: 265 mi (230 nmi; 426 km)
  • Service ceiling: 15,000 ft (4,572 m)
  • Rate of climb: 1,880 ft/min (9.6 m/s)

Notes

  1. ^ a b c d Taylor 1969, pp. 388–389.
  2. ^ a b Matt, Paul R. "Anderson Greenwood AG-14 and the MARVEL program". Retrieved 31 December 2009.
  3. ^ a b c "History: XV-11A Marvel". Department of Aerospace Engineering, Mississippi State University. Retrieved 31 December 2009.

References

  • Taylor, John W. R. Jane's All The World's Aircraft 1969-70. London:Jane's Yearbooks, 1969.
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