Stirlingengineforum.com

Nice machining work Microwave, I am currently running a LTD engine with the displacer about 20 degree's ahead of the power piston and it runs best like this. It will run at 90 too but at a higher temp. Another semi-LTD I've built that has a simular design will only run at 90. It seems to vary engine...

I took some time to look at the original design again, your right, not an alpha with valves. I too would like to see a working model. If you attempt to build one, please let us know how it works out. I'm currently working on a rotary gamma that will feature port valves just for kicks. Not sure if th...

Well done. Nothing quite like that moment when it runs on it's own power the first time.

That is a well proven design, should run very well as long as the friction is low and the compression isn't too high. When completed, it should rotate many revolutions with a good flick of the flywheel (before you heat it)

You could gain some power (torque) with additonal cylinders over a single large engine if the cylinders power stroke is staggered. (like in any multi-cyinder internal combustion engine) You will get multiple power stokes in a single crank rotation. The friction problem has more do due with your abil...

It's best to keep the stoke and bore close to the same. A large bore will also have more friction than a smaller bore with a longer stroke. A larger diameter cyinder with a short stroke will aslo respond better to smaller changes in pressure. It really depends on the type gamma your trying to build....

I have drawn one up but have yet to build it. My version will have two seperate displacers with each hooked to each end of the double action piston/cylinder assembly. There is a thread here http://stirlingengineforum.com/viewtopic.php?f=1&t=360 that shows some examples of working double action S...

idkleine, Thanks for the link! I think I came accross that one a while back too. I have drawn up a model with two displacers and a double action power cylinder (which I have now) but have not had time to build it. My model will be small and not much in the way of power producing. I was mainly intere...

It is possible to have too much compression on an LTD Gama engine. I have found a short power piston stroke results in your engine running at lower temp differentials. As always, your engine should spin half a dozen (6) or more revolutions with the flick of the flywheel. You should be able to feel s...

Sounds like compression is a bit high. You should be able to have it spin over half a dozen or so cycles with the flick of the flywheel. I would shorten the power piston stroke or possibly try a heavier flywheel if changing the stroke isn't an option. Yes, it's a "closed loop"...but, I hav...

yes, 90 degrees offset. Same as Alpha. This can be varied slightly for better results on some engines.

I have read the ratio should be 1.5 to 1 (displacer volume to power piston volume) This is the ratio for a typical power producing (some power anyway) engine. An LTD Stirling has a ratio of 10 to 1 or more. The higher the ratio, the lower the temp ratio becomes.. to a point. Friction and weight of m...

The problem is the drums are comparativley very thin and to get any real work out of the engine you need to apply significant pressure to the working piston. This is not a problem with toy engines that can barely overcome their own friction. They no not operate at pressures even approching 1 PSI. T...

Maybe this site will help.
http://heetgasmodelbouw.ridders.nu/Webp ... ameset.htm

Has some good drawings too.

I'm still waiting to see how the 55 gal drum "can" engine works out. There have been quite a few fairly large engines made and are pushing small tractors and small boats around but I've never seen a large "LTD" yet. It seems possible but I'm betting the increase in size would of ...