Tandem dual ducted fan mounted on ground plate. 3/4 rear view. Testing for recirculation decrease in performance of lift fans varies with ground effect.

Photographer NASA

Album A

Location Ames Research Center

Ducted Fan Ames ARC 40x80ft Wind Tunnel Aeronautics

Tandem Dual Ducted Fan Mounted on Ground Plate in Ames 40x80 Foot Wind Tunnel.