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You right ;) English isnt my native language, thats why I may have some lacks of terminology. Sorry for that. Isnt cylinder too big? Am I right that the smaller piston is better (lighter and smaller circumference - less leaks and friction)? Amount of air pushing the piston is same coz it depends on ...

Hi after little break, collecting of materials has go forward since last time (sorry for propably incorrect verb form): - displacer is gonna be made of fused quartz test-tube (beacuse of its light weight, low conductance, and temperature durability) - material for hot cylinder and pistons cylinder i...

Thanks ;)

Ian, we stil dont understand to each other :razz: I mean that proportions 3:1 (displacer length to its diamater )and 1,5:1 (displacer cylinder volume to power piston cylinder volume) dont define displacer cylinder volume (which means displacer stroke indirectly). Take a look at this picture: https:/...

Thanks Ian for keeping be very helpful :wink: I know there should be a gap at both ends. What were I asking was about proportions of displacer length to its stroke. I have ordered tubes today. Unfortunately I couldnt find seamless, so I bought welded ones with dimensions 26,9x1,6mm and 25x1,5mm. Wil...

But aim for as long, within reason connecting rod to reduce side pressure of the piston against the cylinder wall. I'm not sure what exactly do you mean... Can you please tell what about displacer cylinder smoothness? Should it be rough to maximize temperature exchange surface? Can someone please a...

And what do you think about displacer volume to its cylinder volume? I mean what about displacer stroke when you got displacer with given, particular dimensions?

OK, lets say there is a gamma Stirling engine with 20x60mm displacer. The swept volume of displacer cylinder should be 1.5 of swept volume of piston cylinder. Thats theory. 1) These considerations dont define these volumes, just the ratio between these. What about displacer stroke and its cylinder v...

Another problem occured. Which is better: long displacer cylinder with small diamater or short with bigger diameter? Both with same volume

Thanks Ian, you are very helpful

Ok I will look for tubes as thin as possible. For now I've only found 1mm with diameter I want (about 20-24 mm). I guess its not possible to lathe it to 0,25-0,5mm? Which ones are better annealed or not annealed? I've found video with another approach where autor is soldering the end of cylinder (ma...

Thanks for your reply ;) Didnt know the underpressure inside is big enough to collapse aluminium tube! Another problem has occured. As there are only "both-side opened pipes" to purchase (should just say a "pipe"? :eyeroll:) how could I close it? With kind of metal sheet? How to ...

Hi all, I'm preparing to make my first Stirling engine. It's gonna be gamma type. Cylinder and displacer gonna be made of some kind of metals instead of- popular in that purpose- glass test-tubes which are hard to find in suitable dimensions and are easy to damage. Got doubt about it. What features ...