Stirlingengineforum.com

It looks like it was made out of some parts from some old shock absorbers. Possibly off a motorcycle.

Hmmm... I wouldn't believe anything I couldn't get my own hands on. That said, I've been following something called "photonic radiant cooling" which has applications in air conditioning. It is a method of making a surface 'see' space by matching the frequency of the atmosphere or some suc...

The photonic radiant cooling is, to say the leas, interesting. If this material is 9 degrees cooler than ambient air by virtue of just sitting there radiating heat into space one would think it could be put on the top of one of those "ultra LTD" Stirling engines and have it running with no...

Have you ever heard of Charles Tripler ? He had, back in 1890 come up with a way to make liquid air by the barrel full and found that he could use the liquid air to run a steam engine to drive an air compressor to make more liquid air. He was able to use 3 gallons of liquid air in his machine to mak...

After studying all the elements that went into cycling ambient air through this machine and putting it all together in a way that made sense to me, based on basic principles, I imagine the air being cycled this way: Ambient air is drawn in by means of some form of air pump/compressor. The air taken ...

As some here may be aware I've previously posted about the possibility of a heat engine running on ambient heat. Tesla worked on building such an engine and I think somewhere in a letter claimed to have done so. At any rate he wrote about the possibility. Recently I purchased a mini metal lathe and ...

I've often thought that a "displacer" doesn't really do anything but create some turbulence... which alternately helps to bring more air into contact with the hot and cold surfaces. Something that agitates the air while providing greater surface area might very well make for some improveme...

I've been thinking of another approach to the problem. Two displacers, one above the other moving more-or-less independently.

During the Hot phase, the cold side of the chamber would be completely covered by the second displacer and vice versa.

Slip mechanism: https://m.youtube.com/watch?v=P0JWvEQPUJs

And cam: https://m.youtube.com/watch?v=8QE-CmKxz40

The first LTD Stirlings had a slip mechanism to increase "dwell" of the displacer so that it would linger at the hot and cold side and move more suddenly from one side to the other.

A cam could be used to produce a similar displacer motion.

In a four cycle IC engine that initial spark/ignition/sudden explosion... has to carry the engine through several cycles against considerable resistance including a compression cycle and whatever load happens to be on the engine. The timing in a Stirling could be controlled by having the displacer r...

I'm more familiar with IC engines than Stirling, but IMO timing is critical. In an IC engine if the timing is off by just a few degrees the engine could stall under any kind of load. It seems to me that Stirling engines act quite like an IC engine that is rather badly out of time. That is, lacking t...

You can make the displacer directly with panels of ceramic fiber. It's stiff and light weight, and easy to work. I see some online sources for ceramic fiber of various types/brands/compositions Ebay, Etsy... some appears to be flexible (comes in rolls). Also, is it permeable ? Could air get through...

For example: https://m.youtube.com/watch?v=jnNnoEKyrC4

I've been considering making various engine parts out of a mixture of perlite and waterglass (sodium silicate) often used as a DIY furnace cement. This should, I think, be both lightweight and heatproof. There are several YouTube videos on how to make this cement. I've had several styrofoam displace...