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Thanks Aviator168, Got a new perspective on these domed alpha hot pistons. Got a note from Indianola too on his engine. Check out this simular example: http://www.youtube.com/watch?v=PLDwYTGZ57I , possibly without the displacer like dome. Thanks for putting up with my banter! :mrgreen: No problem. ...

Just remember this place I usually get supplies for my aircraft. Interestingly, the tube can be used as cylinders and pistons too. For an 1" OD tube, I found a tube with 1.009 ID. I also found a 2.010" ID for a 2.0" OD.

http://www.aircraftspruce.com/catalog/m ... ng_un1.php

All alpha engines I saw on the net is of this type except one (http://www.youtube.com/watch?v=T8S7bA1I0fQ) which is a true text book alpha. They even have a name for it. "Alpha Rider". The gap between the cylinder and the piston is very little (6µ). So there is not possible to warm the cyl...

Longboy wrote:I would say, "it is connected to top of cylinder". ...Don't u actually watch these videos?

You must be one of those blinds touching the elephant.

Longboy wrote:I sent Indianola a private note on it in YouTube and no response yet.

How about the starter of this thread who also build an alpha engine with a tube not connected to the top of the hot cylinder?

Longboy wrote:

Aviator168 wrote:Just enlighten me. Can you tell me if this an alpha and if the hot piston delivers power?

Asked, answered, doesn't care to know.

Say it to the builders.

power stroke occurs in the cold cylinder

Whatever.

So the cylinders have to connected by something that's round and long and anything does not look like that makes the engine non-alpha. This is so text bookish. I concede defeat on the connecting issue. Just enlighten me. Can you tell me if this an alpha and if the hot piston delivers power? http://w...

Tell me what changed your mind! The piston in the hot cylinder does not displace air from one side of the cylinder to the other side of the same cylinder, rather, it pushes air to the cold cylinder. Also, the piston in the hot cylinder delivers power; but the displacer in a gamma type engine does n...

I've read your comments and you didn't even believe it!... :idea: ...Look again and then read some more comments in the video. Its a displacer. The clue is the location of the air line in hot cylinder and a glass test tube piston in a glass syringe on hot side just doesn't work except as a displace...

He also is running a "Gamma" engine here.

No. It is alpha. That "displacer" in the hot cylinder is actually a piston.

I may be in the minority, but I have always disagreed with the theory that the displacer must be of "low thermal conductivity". The argument for low conductivity is to prevent it from conducting heat through the body of the regenerator and creating a "thermal short". That makes ...

Take a look at this one. http://www.youtube.com/watch?v=ZXSoz9JT ... re=related He's got smaller diameter of the connecting pipe and the pipe is longer as well. Yet he managed to get it up to 1500 rpm.

That's a great looking engine. RPM is a little low for an alpha.

Ahahahah. That's a funny story.