Stirlingengineforum.com

Just looking at the second video, I don't know how long the wooden frame work will last, perhaps you should get to work with some RSJ and a welder. When running the best load I have found is something that will give a fairly constant load that brings the revs to about half the free running speed. Th...

Frontax01, good for you, you have the right idea. Welcome to the forum, and if you can show use a pic of your
motor, don't worry if it's not a video because I have not got to doing it either.

Ian S C

This is what happens when you use the wrong material for a displacer, I'm a slow learner, did it twice on the same motor. It did work, but apart from not being suitable as far as heat conduction, aluminium looses strength when you run the motor's hot cap at red heat. Ian S C DSC01133 (800x600).jpg

Thinking more of the power piston, a short stroke indicates high revs, and low torque, while the reverse is true with a long stroke, but if you work it out both motors will have the same total power. The high speed motor can gain torque by gearing the speed down, vice versa, the low speed motor just...

Lawrence, you could try Philips in Holland. If you put cryocooler in the search window at the top of the page, you;ll find a video a fair way down the fist page, quite interesting, there may be more further on.
Ian S C

Little hot air motors aren't quite useless, here is my ALPHA motor, 20 mm stroke x 30 mm bore, free running max revs 1800 rpm, best working speed 600 rpm - 800 rpm, and here it has a mini power hacksaw, that with a new blade, and a bit of luck it will cut through a bit of 10 mm rebar (steel) in abou...

How long is a bit of string? Length of run depends on a number of things, And small hot air motors will run for quite a while after the water is all gone. To overcome the problem you could have a water tank to feed water to the cooling tower with a float valve to control the water level. Also if you...

Without any maths, my guess is that it looks ok as is, for a bit more air through it a little fan might just get the air moving. My old motor in your Robinson thread has a 12V fan from a computer driven by the generator which also will power a transistor radio. The radiator has 3 rows ot flat tubes ...

Trevor, this is similar to a cooling system used on some old hit and miss "barn engines", that system (comparing to yours), starts with the water reservoir, through the engine, the outlet is then released over a tent like structure of wire mesh on top of the reservoir. The main thing again...

It seems that there are a few 'model engineers" in the Cairns area, there is a couple on the Model Engineer web site, Hopper, and Brian, the former an experienced modeler, and the latter a newby. My second motor used a sewing machine wheel for many years until I needed it for another motor, so ...

Trev, it's a good feeling when you get a motor that you built your self going. I build my motors to be developed, so I don't do much painting, usually just the flywheel. Have known people that have got their motor going, then stripped it down and painted it, then had trouble getting it going again. ...

Qn the full size motor the vertical rectangle between the crank and the flywheel is the water tank. The piston on the motor in the photo is 10" dia, and the axe is to chop the wood for the fire, the owner didn't have any fire wood at home, so he got some bags of fire wood at the petrol station ...

With the Robinson the displacer is short and fat, and in full size has an internal regenerator. At a glance I would say that you are going in the right direction. Here's a photo of a mates Robinson a the local A&P Show the day after it arrived in New Zealand from Australia. Ian S C DSC00729 (640...

I'm looking at a thermos flask, and a hot air motor, do you think it's worth combining the two to see how they go. Maybe I'll wait a while until the temperature goes up a bit, and we get out of mid winter. tew, try putting a lighter motor on the LTD, or find a brushless permanent magnet motor and ru...

Is the bore of the cylinder highly polished? The preferred cylinder for graphite pistons seems to be precision ground glass, stainless steel would be second on the list, followed by cast iron and carbon steel(mild steel is OK), bronze and brass would be good. Aluminium unless treated comes in way do...