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The Preliminary Research Aerodynamic Design to Lower Drag, or Prandtl-D was a series of unmanned experimental glider-aircraft developed by NASA under aerodynamicist Albion Bowers. [1] The acronym is a reference to early German Aerospace Engineer Ludwig Prandtl , whose theory of the bell-shaped lift distribution deeply influenced Bowers.
Data from World Directory of Leisure Aviation 2003-04 and company General characteristics Crew: one Length: 5.3 m (17 ft 5 in) Wingspan: 12.6 m (41 ft 4 in) Height: 1.3 m (4 ft 3 in) Wing area: 7.7 m 2 (83 sq ft) Aspect ratio: 20.5:1 Airfoil: Wortmann FX60-157 Empty weight: 180 kg (397 lb) Gross weight: 300 kg (661 lb) Powerplant: 1 × Zanzottera MZ-35R, 19 kW (25 hp) Propellers: 2-bladed ...
All-fiberglass glider, with foam core sandwiches for the wing skins and fuselage bulkheads. ... (23 ft 8 in) Wingspan: 17.74 m (58 ft 2 in) Height: 1.70 m (5 ft 7 in ...
Antares 18T - 18 meter wingspan glider with Solo 2350 two-stroke gasoline sustainer engine. ... Wingspan: 23.00 m (75 ft 5.5 in) Height: 1.89 m (6 ft 2 in)
The models have evolved into predominantly all composite gliders of 3.4–4 m wingspan with full span flaps and ailerons, sufficiently strong to take a two-man tow in a wind of up to 20 mph. Advances in composite construction have reduced the flying weights of these models to less than 2 kg.
The glider therefore maintains the same trim whether flown single seated or dual seated. ... (26 ft 10 in) Wingspan: 16 m (52 ft 6 in) Height: 1.6 m (5 ft 3 in) Wing ...