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I've been having some difficulty with engineering the connecting rods and trying to keep things balanced. Having designed an LTD style version, to keep the displacers centered and balanced I decided to have one connecting rod slide inside the other. Both would slide through a sleve. I found copper a...

Hi Wellington. . I think this form of cogeneration is one of very few truly useful areas to invest Stirling development. Check out the electronic competition of Thermal Electric Generators first though. Cheap TEGs are becoming more available and may be getting to the point of making all of this muc...

Doesn't it add an awful lot of friction to have the two displacer rods running inside each other? Yes, that was a problem. Particularly because they are thin, soft metal (brass and copper) and tend to bend buckle and bind easily. But that was all that was available at the local hardware. It did wor...

thanh-cuibap wrote: ↑Sun Jan 12, 2020 7:26 pm I will learn more about them when I have time
And hope you succeed with your ideas!

Thanks. That didn't happen this time though. Back to the drawing board.

No, the displacers did not fall off.

IMG_20200115_113056910_resize_30.jpg Well, I got something put together finally IMG_20200115_113045571_resize_2.jpg Haven't. Been able to get it to run though. Not even with bags full of scalding hot water from the tea kettle on top and ice below. I've exhausted all the simple possibilities as far ...

As things progressed, I started trying to mount support brackets and such on the lid of the cookie tin, however it was still far too weak and prone to buckling and bending so I had to add more cross bracing. I ended up going with the seesaw method of counterbalancing as it seemed the displacers real...

I think, just my opinion: TWO DISPLACER will change the principle of stirling motor. Displacer has the effect of moving air from the hot zone to the cold zone and contrary,. Why don't you reduce the weight of displacer? There are many, many different Stirling displacer arrangements. These are regen...

Ok, it just came to me. A pulley system. Like an elevator with a counterbalance. It takes the weight off and lifts straight up, so won't create any friction from lifting in an arch like my initial seesaw arangement. Well, actually the rope and pulley themselves add some friction, but I think that wo...

the inner tube is open on the hot end. The pointed end is just pointed for airflow purposes. the point is basically hollow. I wont be sharing the new design, I have too much time invested to just give it away. After so many here contributed. Gave away all their ideas and experience to help you. Som...

The full patent for the Vuilleumier "METHOD AND APPARATUS FOR INDUCING HEAT CHANGES" from the US patent office can be viewed or downloaded here: https://pdfpiw.uspto.gov/.piw?PageNum=0&docid=01275507&IDKey=91E286F9F878%0D%0A&HomeUrl=http%3A%2F%2Fpatft.uspto.gov%2Fnetacgi%2Fnph-...

The Vuilleumier device is very similar to a Stirling engine, or Stirling cooler, except that it has two regenerative displacers. Like a Stirling it has a hot end and a cold end but it is different in that it takes in heat or absorbs heat from BOTH the hot end, as well as the cold end. So while it ru...

I have a slight issue or problem to work out with the experimental TWO DISPLACER engine I'm experimenting with. I want to try and at least ensure that it will run on a cold sink (ice rather than applied heat) and have every advantage I can give it. To that end, I thought counterbalancing the displac...

Interestingly, after I started working on this around Christmas, the design based on a cookie tin, I came across this video where someone built a Stirling using the same cookie tin. He is supplying a lot of heat from a gas stove to run the thing though. Getting a similar engine to run on ice and amb...

Assuming you can get 20% mechanical power, @ 180rpm, you are going to need to heat at least 10 grams of air up by 100 degree and cool it down again in every cycle. my 2 c I've been wondering about this for a long long time, the "cool it down again" part. Not to be argumentative. Certainly...