I'm impressed that you managed to get your knickers in such a twist and you failed to point out that in fact this is not a Stirling engine at all. A Stirling e

I'm impressed that you managed to get your knickers in such a twist and you failed to point out that in fact this is not a Stirling engine at all. A Stirling engine must have a regenerator which temporarily stores the heat from one stroke to the next. Otherwise it is just a hot air engine which is altogether more ancient.