This is my first Ross yoke engine. The Ross yoke is named after its inventor, Andy Ross. The mechanism allows for a dual connection on one crank, and also has the benefit of reducing side load because the connecting rods have almost no sideways movement. This particular engine uses a variation on the conventional Ross linkage, it has two pins running on a vertical rod to keep the yoke in position. The Ross yoke has the effect of magnifying the crank throw, so to end up with a total piston motion of 7mm we only need a crank throw of 2.5mm.
Main dimensions:
Crank throw: 2.5mm
Piston diameter: 9.5mm
Piston stroke: 7mm
Chamber height: 12.5mm
Chamber internal diameter: 74mm
Displacer height: 8mm
Flywheel diameter: 82mm
This engine operates on the heat from my hand, and will do anywhere from 40 to 160rpm, depending on the temperature differential.
