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  2. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    1:43.5: 7.02 mm: Model railways (0) Exact O scale of 7 mm = 1 foot. 1:43: 7.088 mm: Die-cast cars: Still the most popular scale for die-cast cars worldwide, metric or otherwise. It originates from British O scale. 1:40: 0.3 in: 7.620 mm The very early models of the British Coronation Coach and a few other horse-drawn wagons were made in this scale.

  3. HO scale - Wikipedia

    en.wikipedia.org/wiki/HO_scale

    16.5 mm ( 0.65 in) Prototype gauge. Standard gauge. HO or H0 is a rail transport modelling scale using a 1:87 scale (3.5 mm to 1 foot). It is the most popular scale of model railway in the world. [1] [2] The rails are spaced 16.5 millimetres (0.650 in) apart for modelling 1,435 mm ( 4 ft 81⁄2 in) standard gauge tracks and trains in HO.

  4. Plymouth Valiant - Wikipedia

    en.wikipedia.org/wiki/Plymouth_valiant

    It was designed to use the same front end sheet metal, running gear, and 108 in (2,700 mm) wheelbase as the Valiant, but Plymouth's stylists gave the car an entirely new look by using a modified fastback configuration with radically curved side glass having only half the curvature radius of conventional side glass. Though the 340 cu in (5.6 L ...

  5. Worm drive - Wikipedia

    en.wikipedia.org/wiki/Worm_drive

    Given a single-start worm, a 20-tooth worm wheel reduces the speed by the ratio of 20:1. With spur gears, a gear of 12 teeth must match with a 240-tooth gear to achieve the same 20:1 ratio. Therefore, if the diametrical pitch (DP) of each gear is the same, then, in terms of the physical size of the 240 tooth gear to that of the 20 tooth gear ...

  6. Image sensor format - Wikipedia

    en.wikipedia.org/wiki/Image_sensor_format

    In digital photography, the image sensor format is the shape and size of the image sensor . The image sensor format of a digital camera determines the angle of view of a particular lens when used with a particular sensor. Because the image sensors in many digital cameras are smaller than the 24 mm × 36 mm image area of full-frame 35 mm cameras ...

  7. Turbo-Hydramatic - Wikipedia

    en.wikipedia.org/wiki/Turbo-Hydramatic

    The typical width of this transmission where it bolts to the engine is 20 in (51 cm) overall. From the engine/trans mating surface to the cross member mount bolt is 22.5 in (57 cm), and engine/trans surface to output shaft housing mating surface is 23.375 in (59.37 cm) overall, with the tail shaft housing typically measuring 7.625 in (193.7 mm).

  8. Waist–hip ratio - Wikipedia

    en.wikipedia.org/wiki/Waist–hip_ratio

    Social aspects. v. t. e. The waist–hip ratio or waist-to-hip ratio ( WHR) is the dimensionless ratio of the circumference of the waist to that of the hips . This is calculated as waist measurement divided by hip measurement ( W⁄H ). For example, a person with a 75 cm waist and 95 cm hips (or a 30-inch waist and 38-inch hips) has WHR of ...

  9. Display aspect ratio - Wikipedia

    en.wikipedia.org/wiki/Display_aspect_ratio

    The display aspect ratio ( DAR) is the aspect ratio of a display device and so the proportional relationship between the physical width and the height of the display. It is expressed as two numbers separated by a colon ( x: y ), where x corresponds to the width and y to the height. Common aspect ratios for displays, past and present, include 5: ...

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