Wikipedia
Anton Flettner, Flugzeugbau GmbH was a German helicopter and autogyro manufacturer during World War II, founded by Anton Flettner.
Flettner aircraft included:
- Flettner Fl 184 - Reconnaissance autogyro, prototype
- Flettner Fl 185 - Reconnaissance helicopter, prototype
- Flettner Fl 265 - Reconnaissance helicopter, prototype
- Flettner Fl 282 Kolibri (Hummingbird) - Reconnaissance helicopter
- Flettner Fl 339 - Reconnaissance helicopter, project
- Flettner Gigant - Experimental helicopter
Anton Flettner's interest in aerodynamics (specifically the Magnus effect, which produces a force from a cylinder rotating in a fluid flow) also led him to invent the Flettner rotor which he used to power a Flettner ship which crossed the Atlantic, and the Flettner ventilator which is still widely used as a cooling device for buses, vans and other commercial vehicles and which is based upon the Savonius principle.
Usage examples of "flettner".
Flettner sails, invented by the German aeronautical engineer Anton Flettner, the man who conceived the trim tab for aircraft.
Now you know all there is to know about the Magnus effect and the Flettner sail, except that they are approximately ten times as efficient as traditional sails of the same area.
In fact, because the current, wind, and Flettner sails brought it nearly ten miles farther north than we anticipated, we will bypass Anchors Nos.
Beyond AN-2 you can now make out the Flettner sails silhouetted against the sea, and just off our bow--you can see it on the screen but not from the observation windows--AN-3.
Should the iceberg wander just ten miles northward, it would be seized by the powerful Equatorial Countercurrent, flowing back toward Africa at 22 nautical miles a day, too great a speed for its Flettner sails to fight.
As he spoke, the three tankers had nearly reached the points which had been determined by the Planning Organization, not absolute map coordinates but rather positions at the vertices of that imaginary triangle in the center of which the Sun King and the Alamo were being borne by the South Equatorial Current, Flettner sails, and oceangoing tugs toward South America.
They could be slowed by reversing the Flettner sails, perhaps, and by warping the Sun King into a circular course.
The Flettner sails, with a slight nudge from the Sun King and its tugs, eased the Alamo out of the South Equatorial and into the Guiana Current on schedule on 1 April, 18 days after they had pierced the triangle of fire.
During this leg, where the current provided twenty and the Flettner sails sixteen nautical miles of the distance made good, they made the slowest progress of the entire run, an average of only forty-three miles a day for thirty days.
Another seven mpd would be picked up by the Flettner sails rotating against the lighter winds of the gulf.
The log was routine stuff: ice melt rate, fissure and fracture estimate, linear meters of refrigeration shaft excavated and filled, condition of the Flettner sails, harness, towing cables, and Ultravac sealing, personnel changes, sick list, and the like.
I reckoned it was going to take me another century or two to become hardened to the mad bull take-offs and landings of these Flettner craft.
Then the warning alarm sounded and Brennand and I clung like brothers while the ship switched to Flettner drive.
What you're looking at are sails-- Flettner sails, invented by the German aeronautical engineer Anton Flettner, the man who conceived the trim tab for aircraft.