Stirlingengineforum.com

Unpressurised the working pressure is(about)30psi, and on heating can be double that, so the maximum pressure is 60 psi. Now put the pressure up to 200 psi, then heat it to double the temperature (Kelvin), and you are looking at 400 psi, it's also going to take more heat(not temperature) to heat th...

In the ALPHA motor shown the crankshaft would be enclosed and the whole engine pressurised, sometimes there is no crankshaft protruding, instead a generator is built inside the motor making sealing a bit easier. For engines up to 200 or 300psi air is OK, cheaper, and easier to manage, 1200psi or so...

I'm a bit confused as to how a pressurized stirling works. At the top of this page is an animation of an alpha engine: https://en.wikipedia.org/wiki/Stirling_engine If this engine was pressurized where in the engine is the elevated pressure? Is the Hellium in the regenerator and in the generator sid...

Simple and easy are entirely different things. To return to the original premise of a useful engine to add on to a woodstove: In Stirling-engine parlance that's a moderate-to-low temperature heat source, so you need a relatively large engine to process heat in and out externally, regardless of how ...

Narrow street bicycle tires can inflate as high as 130 psi. That's about ten bar. (The first bar wouldn't show on a gauge.) Bumpkin Thanks bumkin. So I guess people just stick a bike tyre valve on their engines heat tube to pressurise them and attach a diaphragm at the cold end and I will have a te...

Wellington, if you are able to build an engine that can take advantage of 10 bars of pressurization, I have no doubt that you will easily resolve the relevant safety issues. The truth is I have no clue how to design a 10 bar stirling but would very much like to know. I have access to a tig welding ...

I just wanted to make some comparisons in the effort required to build a 100w prime mover that will run on "free fuel". As you know, many people, such as Andy Ross, begin the hobby of Stirling engine building and within the first few months realize the very substantial technical challenge...

Ian S C wrote:Torque is the turning motion of a crankshaft, I'm not sure what you call the force of the piston in a straight line as in a free piston motor.

lol no, nore do I know which word to use which is why I used torque. give it more "umpf" maybe?

Earlier today I lodged a provisional patent titled GATED HEAT MOTOR in Australia. Basically I have found a way, very simple way, to circumvent the issues associated with trying to get the heat and the cool energy through thick walls in high pressure devices. I have posted enough detail on the faceb...

I think the nearest to a diaphragm in commercial Stirling engines is the "roll sock" seal on a piston, these are rated for tens of thousands of hours continuous running. In case of break down some means of auto shut off for the gas could be arranged. Ian S C Tens of thousands of hrs runni...

For a start I'll suggest that you find and down load(it's free) Andy Ross's book "Making Stirling Engines". I'll put the advantage of pressurisation as simple as possible.(note temperature is absolute 273.15*K)At atmospheric pressure the max pressure you get by doubling the temperature is...

Can anyone offer up any tips on designing a free piston stirling engine with linear alternator to run as quietly as possible? I'm wondering which parts of the engine will make the most noise. I was also wondering what can be done to increase torque in a free piston engine.
.Wellington.

Wellington, I will offer some very practical advice to add to Ian's excellent suggestions..... Thanks Alfista, all good tips I will be looking into. Ive seen a small Andy Ross engine which generates aprox 100W output. Have you any idea where I might buy such an engine? or have you seen any engines ...

About 6 or 7 years ago Whispergen move production to Spain, retaining development and research in New Zealand, but five years ago we had a major earthquake here in Christchurch which finished off the NZ end of things, the workshops etc are now just a bit of flat bare land, the building was owned by...