Stirlingengineforum.com

I don't know if I can help you much but I can share what I have learned over the years. As far as my engine design goes I did release the designs and they are still out there to be downloaded. The tube within a tube design actually has many purposes. Mainly creating a stack . The gap between the two...

You would need to use a fairly long spring in order to keep a constant even tension. I considered this a couple of years ago but never tried it. I think it would work

You could possibly pressurize the engine internally and use a spring to simulate external pressure.

Must be a top secret company. no link for the public to see.

I noticed an error in my last post. It should read 1500 strokes per/min.

Ive made some changes to the engine. It seems that the heating is so much more efficient that I have been able to greatly increase compression. approx. 1 : .75 , lowering compression does not increase stroke length. Currently Piston 3.35inch diameter, stroke 4inches, 3500 strokes per/min free piston...

What inspired the multitube design? I thought your tube within a tube design to be very clever. Is there elements here? I have a flame licker that doesn't run well, thinking of converting it to a thermo acoustic. Is there literature on the tube ratios and such? The tube within a tube design ran wel...

Clever. Does the heat need to be concentrated at one end of the tubes? I wonder if a wood fire could be applied along the tube heat exchanger. What watt output does it have? How long can it run? (Gives clues how well it dumps heat.) I wonder how much better it would run with cooling fins (with belt...

I am going to make some changes to the tail end. It uses 29 stainless steel .25 inch tubes welded on each end. The hardest part is to weld the tubes without air leaks. I tried to mig weld the tubes but could not get leak free welds. Tig welding was the key. Thanks for the interest.

This is just a first test of a new Engine I have designed. The heat source is small but it runs quite well with just a small pencil torch.

[youtube]https://youtu.be/5fluS_u13wI[/youtube]

Video?

cbstirling2 wrote:Ian, what do you think is a lifetime of a graphite piston? What about Teflon?

If your cylinder walls are smooth the piston will last a very long time. Ive been using the same piston for years. It is also very easy to machine.

You need to replace those pistons with graphite pistons.

I just purchased a tig welder and as soon as i learn how to use it i will try some multiple tube designs. I am currently practicing welding .25 inch ss tubing.

I based it on a video posted here a while back. The member who posted the vid was Geoff V. It was a much smaller version but he never provided any dimensions. Through trial and error I managed to produce a larger version.