Common Slot Car Scales
There are three common slotcar scales (sizes): 1:24 scale, 1:32 scale, and so-called HO size (1:87 to 1:64 scale). These are also commonly written as 1/24, 1/32, 1/87 and 1/64. Usual pronunciation is "one twenty-fourth," "one thirty-second," and so on, but sometimes "one to twenty-four," "one to thirty-two," et cetera.
- 1:24 scale cars are built so that 1 unit of length (such as an inch or millimetre) on the model equals 24 units on the actual car. Thus, a model of a Jaguar XK-E (185" or 4.7 m overall length) would be 7.7" long (19.6 cm) in 1:24 scale. 1:24 cars require a course so large as to be impractical for many home enthusiasts, so most serious 1:24 racing is done at commercial or club tracks.
- 1:32 scale cars are smaller and more suited to home-sized race courses but they are also widely raced on commercial tracks, in hobby shops or in clubs. This scale is the most popular in Europe, and is equivalent to the old #1 Gauge (or "standard size") of toy trains. Our Jaguar XK-E would be about 5.8" (14.7 cm) in 1:32 scale.
- HO-sized cars vary in scale. Because they were marketed as model railroad accessories, the original small slot cars of the early 1960s roughly approximated either American/European HO scale (1:87) or British OO scale (1:76). As racing in this size evolved, the cars were enlarged to take more powerful motors, and today they are closer to 1:64 in scale; but they still run on track of approximately the same width, and are generically referred to as HO slot cars. They are not always accurate scale models, since the proportions of the tiny bodies must often be stretched to accommodate a standard motor and mechanism. The E-Jaguar scales out to 2.1" (5.3 cm) in 1:87 and 2.9" (7.3 cm) in 1:64). Though there is HO racing on commercial and shop-tracks, probably most HO racing occurs on home racetracks.
In addition to the major scales, slot cars have been commercially produced in 1:48 and 1:43 scale, corresponding to O scale model trains. 1:48 cars were promoted briefly in the 1960s, and 1:43 slot car sets are generally marketed today (2007) as children's toys. So far, there is little organized competition in 1:43, but the scale is gaining some acceptance among adult hobbyists for its affordability and moderate space requirements. The E-Jag would be 4.3" (10.9 cm) in 1:43.
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