What health and safety laws/legislations would I need to cover if i was making a sterling engine?
any help is much appreciated...thanks

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Where do you intend to run the engine?
Then they'd have to make a special tax, or fees, or licenses, just for this new kind of engine.
But that's really only a danger if the engine actually works, especially if it works so well that it could be competitive with what's already out there.
There disadvantage in larger sizes is they take a little while to develop power (a bit like a steam engine does.) many auto companies have tried to get them to work effectively in cars.
Multi fuel is the best advantage and the ability to make from none metallic materials such as high temp plastics and ceramics.
http://www.plugincars.com/states-consider-taxing-evs-make-lost-gas-tax-revenue-106946.html
What your going to do
How big the Stirling is going to be.
Stirling engines get hot but don't generate a high internal pressure. other than that moving parts are always a danger to questing fingers.
Heat - naked flame
Moving parts
If you are just making a small item without commercial aims you might not even need to follow any specific norms.