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Free Cad Models !

MH-Aerotools  downloadable 3d solid models of COX engines !

VRML Models   nice 3d model, a glow engine, faceted though,

3d-CAFE  various assortment of 3d models

3d Content Central   its free and you have to register, very simple, plenty of models with an aircraft section.

3D Model Sharing

 

 

Pay Sites

3d CAD Browser   plenty of 3d models

TurboSquid   3d models

3d Model Works

The 3D Studio