Building another Stirling

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cidrontmg:
Well, thank you all for your comments, I didn´t think it would go this quick myself. I´ve done a few engines, and usually (=every time except this one) they have given more than enough labour pains. BUT - it´s not "finished" yet, although it runs (or at least limps). It sorely needs another longer displacer piston + tube. As it it, it won´t run very long, some 15 minutes, and then the displacer cylinder gets too warm, and the music stops. It gets too warm exactly because it is too near the heat source. The glass tube extends now some 30 mm from the ali top, the original idea was something like 70 mm (=over twice as much!). I expect with that modification it will run "forever". And have far more power and speed.
Also I should point out that I´m retired, so I have more time for the shop than anyone with a daily work. And with the weather mostly rainy, even a naturally lazy guy gets some things done.
Proof of which is the new lamp I put together. Rainy day, once again.

The thing started as a tea light (candle), it´s made of tinplate (iron, basically), and it has a lid, with a glass window. I soft soldered a curved 6 mm tubing to it, made a small cap for the tube (to keep the spirit from evaporating, should there be any left from running). And pulled the wick into the tube. This has a far bigger flame than the other, with a 4 mm tubing for the wick. 4 mm outside = 3 mm inside = 7 mm2. 6 mm out = 5 mm in = 19.6 mm2. Not quite, but almost three times. With this lamp, the small engine really spins!
The lamp being of iron is handy in that you can fix a magnet to the base board (a round neodymium just needs a drilled hole), and it will keep the lamp from moving with the engine vibration. That´s why the base in the small lamp is a round steel stamping. Although I admit that all-brass lamps look nicer... :)
There´s more to come, but not tomorrow!
:wave:

cidrontmg:
Fat lady doing a duet.

:wave:

Stilldrillin:
Blummin well done Olli! :clap: :clap: :clap:

Love the slower revs of the big 'un..... :thumbup:

David D

arnoldb:

--- Quote from: Stilldrillin on December 02, 2010, 03:55:30 AM ---Blummin well done Olli! :clap: :clap: :clap:

Love the slower revs of the big 'un..... :thumbup:
--- End quote ---

:clap: :clap: I agree fully with David Olli

:beer:, Arnold

madjackghengis:
Well Oli, it looks like you've got it running, and done a very nice job in getting it so. I expect your experience with parts fulfilling your original expectations will make it run better and with more power, and make it a matter of full satisfaction. For the moment, they run very well, and certainly show your fine labor in bringing them about. I really like the glass for the displacer cylinder, and the brass/aluminum combination for looks. Good job all the way 'round :beer: :jaw: mad jack

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