Stirling engine 5W generator air cooled

Описание: On this video, you can see the electrical output increasing to 5W at 600 rpm (max power 6.2W at 640 rpm)
With this engine, I can heat and light my workshop.
It provides 5We at atmospheric pressure with 500W gaz consumption.It' just for cogeneration (1% global efficiency!!!).
I use a DC motor (12V-2000rpm) connected with a timing belt and two pulley (80 teeth for engine shaft et 15 teeth for the motor shaft.
Multimeters : the red one indicates dc courant in mA et the green one is for the dc voltage in volt.
This engine can also run with an alcohol lamp and produces 3,5W (efficiency around 0,6%).
About the two big stainless steel boxes :

The front one collects wind for the cold part of the thermic cylinder and the behind one is for cooling the power piston.
The thermic cylinder is a 100mm stainless steel pot (diameter : 70 mm outside/69mm inside).
Displacer (stainless steel cylinder extracted from a water bottle) : lenght : 79mm, diam : 66mm.
I work on this engine for 2 years and fix a lot of problems.
I start to build a fan (600rpm, alcohol burner 15g/h) to test graphite piston and after a lot upgrades....
Graphite piston : no lubrification and no gasket (the dream!)
Don't hesitate to comment or ask for questions!
I'll make other video so please suscribe if you like.
See you soon.