Balandin Type engine 3D model (revised)

This is revised version. Previous one has wrong crankshaft rotation modeling. “Conrod Free“ engine was invented 1935 by in has unique double-crank system so the piston rod moves just up and down, rather than usual swing motion. It was thought this type of engine cam achieve lower friction, faster piston speed, thus higher power with lower fuel consumption. Later, two-sided double action piston is also tested. 4-cylinder prototypes were tested between 1937-1941, then suddenly the Comm