ATOT Nef Thread?

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MotF Bane

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Dec 22, 2006
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Still mulling over a Stirling engine design. I'm thinking the far end of the gas chamber should have a hole, say 25mm diameter, while the interior of the chamber is 30mm in diameter. Then craft a copper object, with a baseplate 30mm diameter by maybe 5mm thick, perhaps with milled pins, like a waterblock. From the baseplate, project a 25mm diameter by about 75mm long cylinder of copper. Should be about the best way to transfer heat from the source into the chamber.
 
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MotF Bane

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Dec 22, 2006
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And I just saw a suggestion on a home machinist's forum - use Delrin, or some other inert plastic, for the displacer piston. The thermal expansion appears to be lower, although I haven't confirmed that yet, and the density is well under 50% of aluminum. All for a material that is likely to be cheaper, and certainly easier to manipulate.
 
M

MotF Bane

No Lifer
Dec 22, 2006
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Also, after looking at an animation of the beta cycle, and a Youtube video of the components of the beta cycle, I understand how the inner piston is operated.
 
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MotF Bane

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Dec 22, 2006
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Perhaps the Delrin piece should have holes through it to allow the gas to pass through, thereby allowing the outer rim to slide against the inner wall of the cylinder.
 
IndyColtsFan

IndyColtsFan

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Sep 22, 2007
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Want to take bets on how long it takes our resident Jets fan to take issue with this comment I made in the "OMG Rex Ryan..." thread?

His dad talked even more shit and was even more ridiculous. Ryan's plan is to talk trash and make the media focus on him and also, to piss the Patriots off and increase the pressure on them while relieving the pressure on his team. It isn't going to work. He barely beat a half-dead Colts team.
Click to expand...
 
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MotF Bane

No Lifer
Dec 22, 2006
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I can't imagine the holes would create a significant imbalance. It would need some sort of slight lubricant on the edges though to move freely.
 
M

MotF Bane

No Lifer
Dec 22, 2006
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I can't build magnetic bearings now, certainly can't do electrodynamic bearings... so I guess skateboard bearings or similar high-quality bearings for the flywheel.
 
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MotF Bane

No Lifer
Dec 22, 2006
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I'm quite certain two beta cylinders will provide superior power - twice the heat, twice the energy. Roughly.
 
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MotF Bane

No Lifer
Dec 22, 2006
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Metal will provide a large, difficult to build, but very durable, stable, and professional looking construction. The thermal conductivity may or may not be a positive, depending on which piece it is, the thermal expansion is a negative characteristic, and the weight, if on a moving part, is a definite negative. Except for the flywheel.
 
M

MotF Bane

No Lifer
Dec 22, 2006
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The school doesn't let anyone use the machine shop (and I use that term loosely) except Mechanical Engineering majors with several specific classes first.

The shop, however, is just four lathes, ten mills, and it's all ancient stuff.
 
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