why is the representative fraction (rf) the universal standard for scale
Scale (map) Actual printed maps are produced from the projection map by a constant scaling denoted by a ratio such as 1:100M (for whole world maps) or 1:10000 (for such as town plans). To avoid confusion in the use of the word 'scale' this constant scale fraction is called the representative fraction (RF) of the printed map and it is to be identified with the ratio printed on the map. The actual printed map coordinates for the equirectangular cylindrical projection are
1:64 scale Currently, 1:64 scale is most commonly used for automobile and other vehicle models, but it is also a popular scale for model railroads and toy trains, and has been used for ship models, also. In addition, 28mm military and fantasy figures are a popular size for tabletop gaming, and they are sometimes scaled out to 1:64, although opinion on the actual scale of 28mm range from 1:48 to 1:64.