Engineering:Polniak LP Dedal
| Role | Human-powered aircraft |
|---|---|
| National origin | Polish |
| Manufacturer | Leon Polniak |
| Number built | 1 |
| Developed into | LP Dedal-2 |
The LP Dedal human-powered aircraft was the project of Leon Polniak, a Franco-Polish engineer based in Kraków, Poland .[1] Dedal is Polish for Daedalus.
Development
Inspired by the Kremer prize, Polniak began the design of the aircraft in 1966, and construction commenced in 1967.[2] Construction reportedly involved 6,000 hours.[3]
The Dedal was a wire-braced parasol-wing monoplane of conventional configuration, and fitted with a tractor propeller. The fuselage was of the pod-and-boom type.[2] The wing planform was located immediately above the fuselage, attached by a single pylon. The wing consisted of six panels, all of constant chord, with the two outermost panels set at a substantial dihedral angle.[2] The pilot sat in a conventional cycling position, and powered the tractor propeller via a belt drive.[2][4] The aircraft was primarily constructed from pine and balsa.[3]
The aircraft was due to fly in 1972 but, according to Jane's all the world's aircraft 1973-74, when it was 50% complete, it was damaged while being transported, with Polniak then deciding to build an improved version, the LP Dedal-2.[5]
Specifications (LP Dedal)
Data from Jane's all the world's aircraft 1972-73,[2] and Mięśnioloty[3]
General characteristics
- Crew: 1
- Length: 7.20 m (23 ft 7 in)
- Wingspan: 25.00 m (82 ft 0 in)
- Height: 3.40 m (11 ft 2 in)
- Wing area: 43.80 m2 (471.5 sq ft)
- Aspect ratio: 14.3
- Airfoil: Eiffel 400
- Empty weight: 20 kg (44 lb)
- Gross weight: 125 kg (276 lb)
- Max takeoff weight: 105 kg (231 lb)
- Powerplant: 1 × Cyclist , 0.22–0.30 kW (0.30–0.40 hp)
- Propellers: 2-bladed, 2.70 m (8 ft 10 in) diameter fixed pitch
Performance
- Cruise speed: 25 km/h (16 mph, 13 kn)
- Wing loading: 2.40 kg/m2 (0.49 lb/sq ft)
See also
References
- ↑ "Polniak Leon" (in pl). samolotypolskie.pl. http://www.samolotypolskie.pl/samoloty/15821/126/Polniak-Leon.
- ↑ 2.0 2.1 2.2 2.3 2.4 Jane's all the world's aircraft 1972-73. London: Jane's Yearbooks. 1972. p. 161. ISBN 0354001094. https://archive.org/details/janesallworldsai0000unse_q4v6/page/161/mode/1up. Retrieved April 15, 2023.
- ↑ 3.0 3.1 3.2 Wojciechowski, Janusz (1979) (in pl). Mięśnioloty. Warsaw, Poland: Wydawnictwa Komunikacji. pp. 107–108. ISBN 8320600294. https://archive.org/details/wojciechowski-miesnioloty/page/107/mode/2up. Retrieved April 15, 2023.
- ↑ "LP "Dedal", 1975" (in pl). samolotypolskie.pl. http://www.samolotypolskie.pl/samoloty/15822/126/LP-Dedal2.
- ↑ Jane's all the world's aircraft 1973-74. London: Jane's Yearbooks. 1973. p. 12. ISBN 0354001175. https://archive.org/details/janesallworldsai0000unse_n7f5/page/168/mode/1up. Retrieved April 15, 2023.
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