Public domain
Rotating Cylinder Applied To Flaps In 40X80 Foot Wind Tunnel.
From the collection of NASA Image and Video Library. Free to download, adapt and use — no permission needed.
About this work
4 propeller model with rotating cylinder flap. Propellers running. 3/4 front view. DAVE JONES (PROPS TURNING)
NASA Image and Video Library’s own descriptionCredit lineRotating Cylinder Applied To Flaps In 40X80 Foot Wind Tunnel.. NASA/ARC, 1967-06-23. Public domain. ID: A-39267.