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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2015  Wikimedia, Wikidata
NASA Prandtl-D; Preliminary Research Aerodynamic Design to Lower Drag
unmanned aerial vehicle, experimental aircraft, glider, Armstrong Flight Research Center, National Aeronautics and Space Administration, United States, 
NASA, United States, Ashkenaz, Calvinist Republic of Ghent, Chinland, Havilah, Kingdom of Martabam-hongsawatoi, Kingdom of Wolaita, Persia, Sikh Confederacy, Tarshish, Dong Fang Hong 2, 2015, Republic of Haiti, 2010s, 

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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