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  2. Tree taper - Wikipedia

    en.wikipedia.org/wiki/Tree_taper

    Tree taper is the degree to which a tree's stem or bole decreases in diameter as a function of height above ground. Within Forestry and for the purposes of timber production, trees with a high degree of taper are said to have poor form, while those with low taper have good form. The opposite is the case for open-grown amenity trees.

  3. Wing configuration - Wikipedia

    en.wikipedia.org/wiki/Wing_configuration

    Low aspect ratio: short and stubby wing. Structurally efficient, high instantaneous roll rate, low supersonic drag. Structurally efficient, high instantaneous roll rate, low supersonic drag. They tend to be used on fighter aircraft, such as the Lockheed F-104 Starfighter , and on very high-speed aircraft including the North American X-15 .

  4. Thickness-to-chord ratio - Wikipedia

    en.wikipedia.org/wiki/Thickness-to-chord_ratio

    The natural outcome of this requirement is a wing design that is thin and wide, which has a low thickness-to-chord ratio. At lower speeds, undesirable parasitic drag is largely a function of the total surface area, which suggests using a wing with minimum chord, leading to the high aspect ratios seen on light aircraft and regional airliners ...

  5. Trapezoidal wing - Wikipedia

    en.wikipedia.org/wiki/Trapezoidal_wing

    Trapezoidal planform. In aeronautics, a trapezoidal wing is a straight-edged and tapered wing planform.It may have any aspect ratio and may or may not be swept. [1] [2] [3]The thin, unswept, short-span, low-aspect-ratio trapezoidal configuration offers some advantages for high-speed flight and has been used on a small number of aircraft types.

  6. Elliptical wing - Wikipedia

    en.wikipedia.org/wiki/Elliptical_wing

    Theoretically, the most efficient way to create lift is to generate it in an elliptical spanwise distribution across the wing. [1] There is no inherent superiority to pure elliptical shapes and wings with other planforms can be optimized to give elliptical spanwise lift distributions.

  7. Window function - Wikipedia

    en.wikipedia.org/wiki/Window_function

    The so-called "Planck-taper" window is a bump function that has been widely used [53] in the theory of partitions of unity in manifolds. It is smooth (a C ∞ {\displaystyle C^{\infty }} function) everywhere, but is exactly zero outside of a compact region, exactly one over an interval within that region, and varies smoothly and monotonically ...

  8. Squeeze bore - Wikipedia

    en.wikipedia.org/wiki/Squeeze_bore

    For example, the service life of a squeeze bore 7.5 cm Pak 41 could be as low as 1000 rounds compared to 5000-7000 rounds for the 7.5 cm Pak 39 (L/48). [3] The diameter of a fired shell could decrease as much as 40% from .50 caliber to .30 caliber (achieved in a version of the M2 machine gun ).

  9. Machine taper - Wikipedia

    en.wikipedia.org/wiki/Machine_taper

    The Jacobs Taper (abbreviated JT) is commonly used to secure drill press chucks to an arbor. The taper angles are not consistent varying from 1.41° per side for No. 0 (and the obscure # 2 + 1 ⁄ 2) to 2.33° per side for No. 2 (and No. 2 short). There are also several sizes between No. 2 and No. 3: No. 2 short, No. 6 and No. 33.