The following list of attributes drives the FRICTION geometric definition. Aircraft components are defined as cross sections in the low fidelity geometry definition. To be able to logically group the cross sections into wings, tails, fuselage, etc they must be given a grouping attribute. This attribute defines a logical group along with identifying a set of cross sections as a lifting surface or a body of revolution. The format is as follows.

• capsGroup This string attribute labels the FaceBody as to which type the section is assigned. This information is also used to logically group sections together by type to create wings, tails, stores, etc.
• capsReferenceArea [Optional: Default 1.0] This attribute may exist on any Body. Its value will be used as the SREF entry in the FRICTION input.
• capsLength This attribute defines the length units that the *.csm file is generated in. Friction input MUST be in units of feet. The AIM handles all unit conversion internally based on this input.