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  2. Bicycle saddle - Wikipedia

    en.wikipedia.org/wiki/Bicycle_saddle

    The part that connects the rails to the seatpost is known as the "saddle clamp". It may be built into the top of the seatpost, or the seatpost may be essentially a pipe that provides a cylinder at the top (often 7 ⁄ 8 in (22 mm)) for a separate clamp to attach. The upper attachment point must be compatible with the rail configuration (though ...

  3. Seatpost - Wikipedia

    en.wikipedia.org/wiki/Seatpost

    A "plain" seatpost (silver) connects the saddle to the frame (red). A microadjust seatpost (black) of a Trek Fuel 80 mountain bike. A seatpost with a significant setback on a BMX bike. A bicycle seatpost, [1] seatpin, [2] saddlepole, [3] saddle pillar, [4] or saddle pin [5] is a tube that extends upwards from the bicycle frame to the saddle ...

  4. Composite overwrapped pressure vessel - Wikipedia

    en.wikipedia.org/wiki/Composite_overwrapped...

    A composite overwrapped pressure vessel (COPV) is a vessel consisting of a thin, non-structural liner wrapped with a structural fiber composite, designed to hold a fluid under pressure. The liner provides a barrier between the fluid and the composite, preventing leaks (which can occur through matrix microcracks which do not cause structural ...

  5. Bicycle seat - Wikipedia

    en.wikipedia.org/wiki/Bicycle_seat

    Hardshell seats are normally made of a composite material such as GRP or carbon fibre although metal and wood versions do exist. A hardshell seat is normally covered with some-form of padding, this is usually closed or open cell foam although some extreme racing machines do not have any padding on the seat to reduce weight and increase efficiency.

  6. Carbon-fiber reinforced polymer - Wikipedia

    en.wikipedia.org/wiki/Carbon-fiber_reinforced...

    Carbon fibers can cause galvanic corrosion when CRP parts are attached to aluminum or mild steel but not to stainless steel or titanium. [16] Carbon Fiber Reinforced Plastics are very hard to machine, and cause significant tool wear. The tool wear in CFRP machining is dependent on the fiber orientation and machining condition of the cutting ...

  7. Cabin pressurization - Wikipedia

    en.wikipedia.org/wiki/Cabin_pressurization

    The pressure differential varies between aircraft types, typical values are between 540 hPa (7.8 psi) and 650 hPa (9.4 psi). [35] At 39,000 ft (11,887 m), the cabin pressure would be automatically maintained at about 6,900 ft (2,100 m), (450 ft (140 m) lower than Mexico City), which is about 790 hPa (11.5 psi) of atmosphere pressure. [34]

  8. Compressibility - Wikipedia

    en.wikipedia.org/wiki/Compressibility

    where γ is the heat capacity ratio, α is the volumetric coefficient of thermal expansion, ρ = N/V is the particle density, and = (/) is the thermal pressure coefficient. In an extensive thermodynamic system, the application of statistical mechanics shows that the isothermal compressibility is also related to the relative size of fluctuations ...

  9. Air suspension - Wikipedia

    en.wikipedia.org/wiki/Air_suspension

    In 1954, Frenchman Paul Magès developed a functioning air/oil hydropneumatic suspension, incorporating the advantages of earlier air suspension concepts, but with hydraulic fluid rather than air under pressure. [13] Citroën replaced the conventional steel springs on the rear axle of their top-of-range model, the Traction Avant 15 Hydraulique ...

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