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2. Semi-trailer aerodynamic device - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_aerodynamic...

   Semi-trailer aerodynamic devices are devices affixed to semi-trailers, for the purpose of reducing aerodynamic drag caused by air turbulence. The two major types of device in use are trailer skirts (or side skirts ), affixed to the underside of trailers, and trailer tails (or boat tails , or rear fairings ), affixed to the rear.

3. Oar (sport rowing) - Wikipedia

   en.wikipedia.org/wiki/Oar_(sport_rowing)

   Macon blades are symmetrical, with an elliptical shape and a ridgeline running down the center of the blade face. The blade is squared off at the end. Despite the blade being symmetrical, modern asymmetrical collars or aesthetic issues regarding decorative paint on the blade face may dictate which side of the boat the blade can be rowed on.

4. Oar - Wikipedia

   en.wikipedia.org/wiki/Oar

   Here, the fulcrum is the blade, planted in the water. The rower pulls on the handle and the boat moves along with them. The "Class II" perspective is important to competitive rowing. Effective rowers learn to lever the boat past the end of the blade, rather than pulling the blade through the water. [4]

5. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   The 19 inch dimension includes the edges or ears that protrude from each side of the equipment, allowing the module to be fastened to the rack frame with screws or bolts. Common uses include computer servers , telecommunications equipment and networking hardware , audiovisual production gear, professional audio equipment, and scientific equipment .

6. World’s oldest person Tomiko Itooka dies; Brazilian nun now ...

   www.aol.com/world-oldest-person-tomiko-itooka...

   Tomiko Itooka, a 116-year-old Japanese woman who became the oldest living person in August 2024, died on Dec. 29, 2024, according to Guinness World Records.

7. Voith Schneider Propeller - Wikipedia

   en.wikipedia.org/wiki/Voith_Schneider_Propeller

   The Voith Schneider propeller was originally a design for a hydro-electric turbine. [2] Its Austrian inventor, Ernst Schneider, had a chance meeting on a train with a manager at Voith's subsidiary St. Pölten works; this led to the turbine being investigated by Voith's engineers, who discovered that although it was no more efficient than other water turbines, Schneider's design worked well as ...