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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 8 + 1 ⁄ 2 in) standard gauge tracks and trains in HO.
Metric (SI) units. 25.4 mm. A fire hydrant marked as 3-inch. The inch (symbol: in or ″) is a unit of length in the British Imperial and the United States customary systems of measurement. It is equal to 1 36 yard or 1 12 of a foot. Derived from the Roman uncia ("twelfth"), the word inch is also sometimes used to translate ...
Derived from the used of 10 yards to 1 inch. Works well with 5mm miniatures where a 6' man equals 5.08 mm 1:350: 0.871 mm: Ship models: Though assumed to be a Japanese size for ship models, its origin lies in the UK, with the release of the 1:350 Javelin and Tribal Destroyer kit in December 1945 in the FROG Penguin range.
For Star Trek: The Original Series, a 33-inch (0.84 m) pre-production model of the Starship Enterprise was created in December 1964, mostly of pine, with Plexiglass and brass details, at a cost of $600. [1] This was followed by a 135.5-inch (3.44 m) production model constructed from plaster, sheet metal, and wood, at ten times the cost of the ...
A simple fraction (also known as a common fraction or vulgar fraction, where vulgar is Latin for "common") is a rational number written as a / b or , where a and b are both integers. [9] As with other fractions, the denominator (b) cannot be zero. Examples include 1 2 , − 8 5 , −8 5 , and 8 −5 .
This translates to a hoppus foot being equal to 1.273 cubic feet (2,200 in 3; 0.0360 m 3). The hoppus board foot, when milled, yields about one board foot. The volume yielded by the quarter-girth formula is 78.54% of cubic measure (i.e. 1 ft 3 = 0.7854 h ft; 1 h ft = 1.273 ft 3). [43]
Its two equal sides are in the golden ratio to its base. [46] The triangle formed by two sides and a diagonal of a regular pentagon is called a golden gnomon. It is an obtuse isosceles triangle with apex angle 108° and base angle 36°. Its base is in the golden ratio to its two equal sides. [46]
Rail height (in thousandths of an inch) is expressed as a "code": thus, Code 55 rails are 0.055 inches (1.4 mm) high while Code 80 rails have a height of 0.080 inches (2.0 mm). [ 2 ] [ 3 ] Common real railroad rails are at least 6 inches (150 mm) tall and can be taller on some roads, so at true scale the rails would be about 0.040 inches (1.0 ...