Other hot air engine ideas

This is a new part of my blog for my other type hot air engine's ideas.

These are very interesting too! :)

Big volume ring type LTD Stirling engine for waste heat recovery, or concentrated sun energy usage.

Magnetic propulsion drive mechanism for Stirling engines

Table toys, or home design engines

Thermoacoustic traveling wave engine

MARBLE-ROCKY Stirling engine with water piston