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  2. Lawn aerator - Wikipedia

    en.wikipedia.org/wiki/Lawn_aerator

    A core/plug aerator removes soil from the ground and leaves the core on the turf. This reduces compaction in the soil, and the holes can stay open for a long time allowing air, fertilisers, and water to reach the roots. Core aeration is suitable for heavy clay soils, and spike aeration is more suited to sandy or loamy soils. Powered aerator vs ...

  3. Aerospike engine - Wikipedia

    en.wikipedia.org/wiki/Aerospike_engine

    The spike forms one side of a "virtual" bell, with the other side being formed by the outside air. [1] The idea behind the aerospike design is that at low altitude the ambient pressure compresses the exhaust against the spike. Exhaust recirculation in the base zone of the spike can raise the pressure in that zone to nearly ambient.

  4. Drag-reducing aerospike - Wikipedia

    en.wikipedia.org/wiki/Drag-reducing_aerospike

    Further development of this concept has resulted in the "air-spike". [1] This is formed by concentrated energy, either from an electric arc torch or a pulsed laser, projected forwards from the body, which produces a region of low density hot air ahead of the body.

  5. Road roller - Wikipedia

    en.wikipedia.org/wiki/Road_roller

    Caterpillar soil compactor equipped with padfoot drum, being used to compact the ground before placing concrete Antique "Kemna" steamroller. A road roller (sometimes called a roller-compactor, or just roller [1]) is a compactor-type engineering vehicle used to compact soil, gravel, concrete, or asphalt in the construction of roads and foundations. [1]

  6. Aerator - Wikipedia

    en.wikipedia.org/wiki/Aerator

    An aerator is a mechanical device used for aeration, or mixing air with another substance, such as water or soil. The word aerator may also refer to: Faucet aerator; Floating surface aerator, used in wastewater treatment; Lawn aerator; Surface or subsurface aerator, used in water aeration; Wine aerator

  7. 59-home Brick development faces stiff opposition, residents ...

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