Prandtl-D

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. The acronym is a reference to early German Aerospace Engineer Ludwig Prandtl, whose theory of the bell-shaped lift distribution deeply influenced Bowers.

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Wikimedia, Wikidata
NASA Prandtl-D; Preliminary Research Aerodynamic Design to Lower Drag
unmanned aerial vehicle, glider, experimental aircraft, 
United States, Ashkenaz, Calvinist Republic of Ghent, Chinland, Havilah, Kingdom of Martabam-hongsawatoi, Kingdom of Wolaita, Persia, Sikh Confederacy, Sweden, Tarshish, Dong Fang Hong 2, Ekran, 2015, 

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Location: KML, Cluster Map, Maps,

Frameless

Team members recover Prandtl-D No. 3 after an early flight (ED15-0330-084)

Prandtl-D No. 2 subscale flying wing makes a right banking turn (ED13-0263-026)

Program manager Al Bowers with PRANDTL-D No. 2 following first test flight (ED13-0263-079)

Prandtl-D No. 2 during an early flight (ED13-0279-54)

PRANDTL-D No. 2 with streamers to study aerodynamic forces (ED14-0222-088)

PRANDTL-D No. 2 subscale model flies in 2014 (ED14-0222-149)

PRANDTL-D 2 in flight with research Alpha Beta vanes

The Prandtl-D No. 3 research aircraft had its first flight on Oct. 28, 2015.

PRANDTL D 3c on bungee during launch with center cover and FOSS

Prandtl-D2 and Prandtl-3C conduct flight formation activities (AFRC2018-0310-06)

Type	Subtype	Date	Description	Notes	Source
commons	image		Team members recover Prandtl-D No. 3 after an early flight (ED15-0330-084)		Commons
commons	image		Prandtl-D No. 2 subscale flying wing makes a right banking turn (ED13-0263-026)		Commons
commons	image		Program manager Al Bowers with PRANDTL-D No. 2 following first test flight (ED13-0263-079)		Commons
commons	image		Prandtl-D No. 2 during an early flight (ED13-0279-54)		Commons
commons	image		PRANDTL-D No. 2 with streamers to study aerodynamic forces (ED14-0222-088)		Commons
commons	image		PRANDTL-D No. 2 subscale model flies in 2014 (ED14-0222-149)		Commons
commons	image		PRANDTL-D 2 in flight with research Alpha Beta vanes		Commons
commons	image		The Prandtl-D No. 3 research aircraft had its first flight on Oct. 28, 2015.		Commons
commons	image		PRANDTL D 3c on bungee during launch with center cover and FOSS		Commons
commons	image		Prandtl-D2 and Prandtl-3C conduct flight formation activities (AFRC2018-0310-06)		Commons