Polniak LP Dedal
{{Short description|1970s Polish human-powered aircraft}}
{{DISPLAYTITLE:Polniak LP Dedal}}
{{Use dmy dates|date=April 2023}}
{{Use British English|date=April 2023}}
| {{Infobox aircraft begin
|name =Polniak LP Dedal |image = Polniak_LP_Dedal.jpg |caption =Three-view of the Polniak LP Dedal }} {{Infobox aircraft type |type =Human-powered aircraft |national origin =Polish |manufacturer =Leon Polniak |designer = |first flight = |introduction = |retired = |status = |primary user = |more users = |produced = |number built =1 |program cost = |unit cost = |developed from = |developed into =LP Dedal-2 |variants with their own articles = }} |
The LP Dedal human-powered aircraft was the project of Leon Polniak, a Franco-Polish engineer based in Kraków, Poland. 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. Construction reportedly involved 6,000 hours.
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. 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. The pilot sat in a conventional cycling position, and powered the tractor propeller via a belt drive. The aircraft was primarily constructed from pine and balsa.
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.
Specifications (LP ''Dedal'')
{{Aircraft specs|ref=Jane's all the world's aircraft 1972-73, and Mięśnioloty
|prime units?=met
|crew=1
|capacity=
|length m=7.20
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|span m=25.00
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|aspect ratio=14.3
|airfoil=Eiffel 400
|empty weight kg=20
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|gross weight kg=125
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|max takeoff weight kg=105
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|more general=
|eng1 number=1
|eng1 name=Cyclist
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|eng1 hp=0.30-0.40
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|cruise speed kmh=25
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|wing loading kg/m2=2.40
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|prop blade number=2
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|prop dia m=2.70
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}}