A useful Stirling engine.

[Ian S CParticipant @iansc]

Dave, the ring burner its self is simple enough: two bits of tube, the inner one about 25/30 mm larger dia than the displacer cylinder, the outer about 20 mm bigger, drill 1.5 mm holes in two or three rows around the inner tube, next you need two discswith a hole, one each brazed/welded, top and bottom of the burner, which will be maybe 30 mm high. Drill a large hole to fit the gas inlet, I remove the top of a camp stove burner and use that. Then all you need to do is work out how to hang the thing on your motor. My motors have a wire mesh peice on the top, to try and contain the flame. No science in my burners, 2 rows 24 holes, 3 rows 36 holes is a rough average. I think some put a strip of wire gauze inside the burner, I haven't. If you get the gas to air ratio right (not too hard)you get a strong blue flame from each hole in the burner. My Ross Yoke motor (see album) has a 2 row burner, and I think it would be helped by a 3 row one. Ian S C

Edited By Ian S C on 23/04/2012 13:32:39

[lyricParticipant @lyric]

Hi Folks, This is the method I used to form the Diaphragm for my TMG.

I hope I have added the link correctly. Cyril

http://www.youtube.com/watch?v=o5rsbgDv6OA&feature=email

.

[Ian S CParticipant @iansc]

Lyric,'fraid I'll have to go to the library in the morning, and use the computor there on broadband,I'm on dialup here, and that will take about an hr & a half to down load, but I want to see it.

At the moment I'm trying some planar spring designs. Ian S C

[Ian S CParticipant @iansc]

Good vidio, thank you. In my experimenting, I made an aluminium diaphram by attaching the diaphram over a sheat of rubber on a wooden faceplate, and running a small metal roller against it, and I think I'll try again on a bit of tin can thickness tin plate. I'll have to have a word with my metal supplier about the Berylium Copper, fingers crossed.

I was looking at your spring, I'v got a suggestion (I may be wrong), it maybe the source of the noise. I think your "spring" is acting as a diaphram as in a car horn. The joining sections between the slots, on both set are in line, where as I would suggest they shoul be staggered, what do think (if you can visualise what I'm thinking) Ian S C

[Ian S CParticipant @iansc]

Not a method of springing that could be used on a TMG, but one I now use on my free piston GAMMA motor, it uses a magnet from a microwave oven in a linear altenator, so I fixed a similar magnet under it so rthat like poles face each other, works well, used to use a veriety of tension and compression springs, but I think I'v solved that problem. Ian S C

[David Paterson 4Participant @davidpaterson4]

First success (very small)

I couln't visualise the way the Ross yoke worked, although it seems the most likely path to success with a straight stirling rather than the TMG (still havent come to grips with that).

Last night I dug the son's meccano out of the cupboard, mine dissapeared many years ago in family moves around the country, and built a model of the mechanism.

not sure if that is a model of a model, but for a chap who can usually visualise stuff on plans pretty well, i was stumped. just how does this appraoch achieve the phase change?

anyhow… one small step completed, and my wife was highly amused with problems being brought onto the coffee table. (it was the first 0 degree night for the year in Canberra last night)

Dave

[Ian S CParticipant @iansc]

Hi dave, we'v had one or two 0deg nights not too bad so far, but we had a good breaze last night round about 80k.

Meccano is a good way to go, when I started on my Ross Yoke motor, I built a model in wood, to the same scale as the motor I intended to build, because I could not really visulise it, theres a picture or two in my album of my rough attempt, the motor has a bore of 35 mm, and a stroke of 20 mm. Ian S C

[lyricParticipant @lyric]

Info on machining planar springs now on. http://youtu.be/kCCcpBtGLAc

Cyril

[Staska SParticipant @staskas35400]

Posted by lyric on 02/05/2012 21:07:36:

Info on machining planar springs now on. http://youtu.be/kCCcpBtGLAc

Cyril

What should be the stifness of the springs ? Or how do they are calculated ?

[lyricParticipant @lyric]

I'm afraid there were no calculations just trial and error, a lot of them

The thickness of the springs is .028 inch

[Staska SParticipant @staskas35400]

Posted by lyric on 11/05/2012 20:55:39:

I'm afraid there were no calculations just trial and error, a lot of them

The thickness of the springs is .028 inch

Thanks for the info. By carefully studying tmg patents, it was found that operating frequency is (k/m)^0.5, where k is displacer spring ratio and m is displacer mass with half mass of displacer spring. If You could provide such info and engine working frequency, i could try to verify what. Power piston diaphragm spring ratio and power piston mass is responsible for phase delay. It is worth to study deeper.

Edited By Staska S on 12/05/2012 20:13:35

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