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  2. 27.5 mountain bike - Wikipedia

    en.wikipedia.org/wiki/27.5_Mountain_bike

    In 2007, 27.5 inch wheels for mountain bike use was popularized by Kirk Pacenti, [6] [12] and in 2013 at least 10 companies had launched models with 27.5 inch wheels, [3] with some parts manufacturers following suit.

  3. Hypersonic speed - Wikipedia

    en.wikipedia.org/wiki/Hypersonic_speed

    Simulation of hypersonic speed (Mach 5) While the definition of hypersonic flow can be quite vague and is generally debatable (especially because of the absence of discontinuity between supersonic and hypersonic flows), a hypersonic flow may be characterized by certain physical phenomena that can no longer be analytically discounted as in supersonic flow.

  4. Bicycle and motorcycle dynamics - Wikipedia

    en.wikipedia.org/wiki/Bicycle_and_motorcycle...

    Normally, road racing bicycles have more trail than touring bikes but less than mountain bikes. Mountain bikes are designed with less-vertical head angles than road bikes so as to have greater trail and hence improved stability for descents. Touring bikes are built with small trail to allow the rider to control a bike weighed down with baggage.

  5. Mach number - Wikipedia

    en.wikipedia.org/wiki/Mach_number

    At Mach 0.65, u is 65% of the speed of sound (subsonic), and, at Mach 1.35, u is 35% faster than the speed of sound (supersonic). An F/A-18 Hornet creating a vapor cone at transonic speed just before reaching the speed of sound. The local speed of sound, and hence the Mach number, depends on the temperature of the surrounding gas.

  6. Normal shock tables - Wikipedia

    en.wikipedia.org/wiki/Normal_shock_tables

    In aerodynamics, the normal shock tables are a series of tabulated data listing the various properties before and after the occurrence of a normal shock wave. [1] With a given upstream Mach number, the post-shock Mach number can be calculated along with the pressure, density, temperature, and stagnation pressure ratios.

  7. Mach 5 - Wikipedia

    en.wikipedia.org/wiki/Mach_5

    Mach 5 (speed), a mach number, 5 times the speed of sound; Mach Five, a racing car in the Speed Racer franchise; Mach-V, an alias of the Marvel Comics character Abner Jenkins "Mach 5" (song), a 1996 song by alternative rock band The Presidents of the United States of America; Wharfedale MACH 5, a loudspeaker in the Wharfedale MACH series