HYBRID OR RINGBOM-STIRLING ENGINES.

Abstract

A hybrid Stirling engine is a Stirling engine with a free displacer and a crank coupled piston. The concept dates back to 1905 when Ossian Ringbom applied for a patent on a hot air engine. Basically it is a separate cylinder (gamma type) Stirling engine without a mechanical displacer drive. The overdriven mode of operation is explained, a first order analysis of the engine is presented and some practical considerations are offered. Several practical Ringbom-Stirling engines are described.