Radial size

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A comparison between the radial sizes. From top to bottom: Tiny, small and large

The radial size is the diameter or mounting position for most parts. If the mounting position is not radial, then the part is either round or one of two special forms. Such rectangular parts as the M-1x1 Structural Panel lack a radial size or its a size to the next bigger diameter like the Probodobodyne QBE. Three radial sizes exist with varying names. The size scale looks like the internal definition as the Mk2 to size 1 Adapter uses this term and starts with 0 and many values in computer programming are starting from 0 rather than 1.

Any stackable part can be connected to any other stackable part. Matching radial sizes only serves to give a rocket a cleaner visual appearance, and several adapter parts exist to allow transitions between radial sizes while maintaining an unbroken surface.

Assets

When creating assets, the correct diameter for a desired model can be found in the table below. The "meter scale" refers to the actual model's diameter, which is then typically scaled up via the default rescaleFactor of 1.25, to give the "actual" in-game diameter. Size scale is used to denote the standard when selecting a node size.

Conversion table between the different definitions
Name Size scale Meter scale Actual size Example
Tiny 0 0.5 m 0.625 m Clamp-O-Tron Jr.
Small 1 1 m 1.25 m LV-T30 Liquid Fuel Engine
Large 2 2 m 2.5 m Rockomax "Mainsail" Liquid Engine


As a special radial size Radial mounted appears. Parts like Rockomax 24-77 so lack general metric counterparts as to eliminate confusion.

Non-cylindrical sizes named "Mk1", “Mk2”, and “Mk3” exist and are used by fuselage parts intended for spaceplanes.