Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Bonjour,
You are absolutely right, during this test, it was not attached to anything and ran it quite too fast.
Usually, I like coupling my 7,5+ cm3 (ot is 8,5 cm3) to 3.5" 4 blades propellers and the one installed is just 2.5" so there won't be much effort even with the coupled pump and I will be able to operate a 30 PSI working pressure as I like and set my gas regulatirs.
Furthermore, at this pressure, the steam is saturated and self-lubricating.