Beta-type Stirling Engine

The beta-type Stirling engine has a displacer and a power piston with the same cylinder. The bottom dead center of the displacer can be lower than the top dead center of the power piston, then the working space is used more effective than the gamma type Stirling engine.

Overlap Volume of a Beta-type Stirling Engine

Here is equations of the overlap volume of a beta-type Stirling engine (in Japanese).