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Thanks Ian, as it stands it would have (75-55-10)/2 = 5mm clear at each end, isn't that enough? Yes, the displacer cylinder bush will be much longer!

Here's the first part of the drawings....comments welcome!

Thanks Jim but it needs tweaking to run as smoothly as yours!

Am I right in thinking the displacer itself should be about 2/3 the volume of it's cylinder for this type of engine? I was thinking of a 20mm diameter displacer in a 25mm tube (air gap of 2.5mm) and making the displacer about 50mm in length.

TIA

picnic

Cheers. I was contemplating replacing the disc with a much smaller (and true-running!) metal crank disc and adding a proper flywheel to the other side to smooth out the motion which as you noted is rather jerky!

Thanks theropod2 - good tip. I replaced the displacer link and crank pin and fitted a water tank. I didn't have any soft solder to hand so I made the tank a good push fit on the top of the displacer cylinder and used some 'plumber's mait' quick setting epoxy (rated up to 160C) to seal the joint. Whe...

Oh, the 'full size' is just my take on the tin can beam engine - http://stirlingengineforum.com/viewtopic.php?f=1&t=880

Here's my almost complete variation of the tin-can beam engine - couldn't resist trying it out even though it still has some temporary/missing parts. Utterly surprised and delighted that it runs although it needs a fair bit of heat! http://www.youtube.com/watch?v=WHjKndxZtnI It's actually the second...

Thanks again. Just need to finish off my first "full size" engine and I'll get on to those drawings!

Thanks Ian... do you mean a ratio of 1.5:1 between the displacer cylinder and power cylinder or displacer itself? I'm going to make some drawings as I go and upload them, if you wouldn't mind looking them over that would be great :D EDIT: By my calculation the power cylinder would be around 9.5mm di...

Is a smaller version of the tin can walking beam engine likely to work or is a minimum volume of air required? I was thinking of the displacer cylinder being perhaps 1 inch diameter and 2 to 3 inches long. I'd be making the parts using traditional model engineering practices rather than using actual...

Just completed my second hot air engine (the first wouldn't run :( ) and here are a couple of pics. It's to my own design, a shameless cobbling-together of various other engines I've seen on the net and I've almost finished drawing up the plans. It's water-cooled has a 9mm dia power piston and 12mm ...