Here is my toy version of the Soviet Kamov Autogyro helicopter designed in 1972. The model is native for Blender 2.79 and the plastic used in rendering is procedural shader. The model was developed starting from blueprint found on Avistar.org.
BLEND (Blender, filesize: 2.81 MB), OBJ (OBJ, filesize: 3.6 MB), FBX (Autodesk FBX, filesize: 4.72 MB), 3DS (3D Studio, filesize: 650 KB), DAE (Collada, filesize: 6.28 MB)