Prestwick Dragonfly MPA Mk 1
| Prestwick Dragonfly | |
|---|---|
| Role | Human-powered aircraft |
| National origin | United Kingdom |
| Manufacturer | Prestwick Man Powered Aircraft Group |
| Number built | 1 |
The Dragonfly was a human-powered aircraft, designed and built by the Prestwick Man Powered Aircraft Group, based at the Prestwick International Airport in South Ayrshire, Scotland.[1]
Design and development
[edit]The aircraft was developed with the specific goal of winning the £50,000 Kremer prize then on offer.[2] Its designer, Roger Hardy, previously had experience with three other HPAs; the SUMPAC, Jupiter, and the Mercury.[3]
An emphasis was placed on it being a practical, easily-built, machine, with the construction requiring a comparatively low amount of work hours.[2][4] It was intended to fly outside of ground effect, reaching an altitude of 60 ft (18 m) in 5 minutes, at what was described as "a small but realistic rate of climb."[1][3] If attempting the Kremer course, such altitude would permit greater room for manoeuvres without suffering from wing tip stalls.[4]
The Dragonfly was a wire-braced high-wing monoplane, with a pylon-mounted propeller, and had no unconventional features. The wing had an aspect ratio of 30, and a relatively high wing-loading. The wing could increase its dihedral under flight load, changing from 6° when static, to 10° in flight. Lateral control was achieved by differential ailerons.[1] The wing had a single wooden box-spar, with a secondary structure made from spruce, balsa and polystyrene. The fuselage was of the pod and boom type, a primary structure made using aluminium alloy, and a secondary structure of balsa. The empennage featured a small all-flying tailplane, or stabilator, and a large fin, half of was the rudder. The entire aircraft was covered in Melinex. The pilot was in a recumbent cycling position, and powered the plyon-mounted propeller.[1]
Construction began in February 1975, and was completed by July. Taxying trials took place in August 1975, however they revealed issues with the craft. It failed to achieve take-off due to the high thrust-line of the propeller and the small moment of the tail-plane.[5] During the following two months, changes made to the aircraft included the strengthening of the rear fuselage, increasing the moment arm of the tail-plane, and changing the pylon-mounted propeller from a pusher to a tractor configuration.[1][6]
Jane's all the world's aircraft 1976-77 wrote that further flight tests may take place from the Spring of 1977 onward.[1] An article in the February 1977 issue AeroModeller stated that Ron Frost had taken over development of the aircraft.[5]
Specifications
[edit]Data from Jane's all the world's aircraft 1976-77[1]
General characteristics
- Crew: 1
- Length: 24 ft 1.50 in (7.3533 m)
- Wingspan: 80 ft (24 m)
- Height: 9 ft 7 in (2.92 m) with propeller horiztonal
- Wing area: 213.50 sq ft (19.835 m2)
- Aspect ratio: 30
- Airfoil: Wortmann FX63-137
- Empty weight: 95 lb (43 kg)
- Gross weight: 232 lb (105 kg)
- Max takeoff weight: 252 lb (114 kg)
- Propellers: 2-bladed fixed pitch, 9 ft (2.7 m) diameter
Performance
- Maximum speed: 23 mph (37 km/h, 20 kn)
- Cruise speed: 19 mph (31 km/h, 17 kn)
- Stall speed: 16 mph (26 km/h, 14 kn)
- Never exceed speed: 31 mph (50 km/h, 27 kn)
- Wing loading: 1.18 lb/sq ft (5.8 kg/m2) at maximum take-off weight
See also
[edit]Aircraft of comparable role, configuration, and era
- Kohm Lady Godiva
- MacCready Gossamer Albatross
- MacCready Gossamer Condor
- MIT BURD II
- MIT Chrysalis
- MIT Daedalus
Related lists
References
[edit]- ^ a b c d e f g Taylor, John W. R., ed. (1976). Jane's all the world's aircraft 1976-77. London: Macdonald and Jane's Publishers Ltd. pp. 487–488. ISBN 0354005383. Retrieved April 23, 2023.
- ^ a b Hardy, R.J. (February 1975). The optimised man-powered aircraft. Proceedings of the Man-Powered Aircraft Group Symposium. London, UK.
- ^ a b Moulton, Ron (May 1975). "Progress with man powered flight". AeroModeller. Hemel Hempstead, Herts, UK: Model & Allied Publications Ltd. p. 294.
- ^ a b Reay, D.A. (1977). The history of man-powered flight. Oxford, England: Pergamon Press Ltd. pp. 298–299. ISBN 0080217389.
- ^ a b Moulton, Ron (February 1977). "Progress with Man Power". AeroModeller. Hemel Hempstead, Herts, UK: Model & Allied Publications Ltd. pp. 102–104.
- ^ Moulton, Ron (March 1976). "Man powered aircraft". AeroModeller. Hemel Hempstead, Herts, UK: Model & Allied Publications Ltd. pp. 144–145.