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  2. Spring-tooth harrow - Wikipedia

    en.wikipedia.org/wiki/Spring-tooth_harrow

    Harrows, whether spring tooth, spike tooth or disc harrows can have a drag connection or have a 3 point mounting. A drag harrow is pulled and cannot be backed up. Three point implements can be raised and lowered hydraulicly and maneuvered more easily. A spring-tooth harrow is a type of harrow, and specifically a type of tine harrow. It uses ...

  3. Harrow (tool) - Wikipedia

    en.wikipedia.org/wiki/Harrow_(tool)

    A spring-tooth drag harrow Disc harrows Crumbler roller, commonly used to compact soil after it has been loosened by a harrow Clydesdale horses pulling spike harrows, Murrurundi, New South Wales, Australia. In agriculture, a harrow is a farm implement used for surface tillage.

  4. Drag harrow - Wikipedia

    en.wikipedia.org/wiki/Drag_harrow

    A 4-foot drag harrow A larger, 12 foot drag harrow simply uses three four foot sections that are connected. A drag harrow, a type of spring-tooth harrow, is a largely outdated type of soil cultivation implement that is used to smooth the ground as well as loosen it after it has been plowed and packed.

  5. Drag-reducing aerospike - Wikipedia

    en.wikipedia.org/wiki/Drag-reducing_aerospike

    A drag-reducing aerospike is a device (see nose cone design) used to reduce the forebody pressure aerodynamic drag of blunt bodies at supersonic speeds. The aerospike creates a detached shock ahead of the body. Between the shock and the forebody a zone of recirculating flow occurs which acts like a more streamlined forebody profile, reducing ...

  6. Drag racers turn Philadelphia into a hellscape with dangerous ...

    www.aol.com/news/drag-racers-turn-philadelphia...

    Hundreds of dangerous drag racers terrorized the streets of Philadelphia over the weekend, setting off fireworks, vandalizing vehicles and even charging at cops trying to rein in the chaos.

  7. Wingtip device - Wikipedia

    en.wikipedia.org/wiki/Wingtip_device

    Wingtip devices are also used on rotating propeller, helicopter rotor, and wind turbine blades to reduce drag, reduce diameter, reduce noise and/or improve efficiency. By reducing aircraft blade tip vortices interacting with the ground surface during taxiing , takeoff , and hover , these devices can reduce damage from dirt and small stones ...