Robinson Hot Air Engine.

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Stilldrillin:

--- Quote from: bogstandard on November 21, 2010, 01:25:38 PM ---If you can Dave, get the whole inside surface sand blasted. Any little pockets of weakness like that will soon show up.

Then a bit of JB Weld or even soft solder will take care of it, just make sure you neutralise the flux afterwards.

John

--- End quote ---

Thanks for that John! :thumbup:

Because of the very thin wall, in places. I have ordered some 5/16" brass tube with .014" wall thickness. Intending to fix with sleeve lock.

This will leave a smooth bore for the air tube, with O rings, mebbe!

David D

Bogstandard:
I never considered that Dave.

That should do just as well.

John

Dean W:
Quite a lot of stirlings use aluminum for the displacer can. It may be a trade-off between a dead weight you have to pick straight up,
and a bit of heat transfer. On this design, the heat transfer should not be a big concern, since the power piston and displacer can are
not directly connected. I.E., when the can gets hot, it will not be putting heat into the cold end, as it would on the type that has both the
power piston and displacer can in a common bore. Did I put that in a way that it makes sense?

Dean

Stilldrillin:
I can understand your reasoning Dean. :thumbup:

Though this type of engine has problems, as the heat is directly underneath the skirt, with no easy exit.

I intend to fit a copper pipe chimney, as I have seen on others. This looks better than several radialy drilled holes, or slots.

I fitted 2 insulating gaskets, made from exhaust manifold cardboard/ metal material, either side of the hot cap flange. (The white line above the skirt).

Anyone got a better idea?

David D

madjackghengis:
Well David, from where I sit, it looks like you've got everything well under control. I didn't mean to assume control of your project with regard to displacers, everything in hot air engines is a matter of trade off, and weight is equally a factor. The main thing is plugging up all the leaks, which you've had to dig to find, and putting on a chimney is certainly a good idea, and will move lots of excess waste heat out of the way. From the way it ran with all the problems, it ought to be a real powerhouse, now that everything is done up right, and patched up right nice and tidy. That is an engine I'd keep in the living room, even if it did cause a bit of "discussion" between me and the Mrs. I'm looking forward to the video when you're ready to run the engine, you've definitely done your share of the "building" of it, even if it was sort of together, when you got it. I think your fix of the displacer chamber will be just what the doctor ordered. :beer: cheers, mad jack

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