Search found 113 matches

by cbstirling2
Mon Nov 13, 2017 8:01 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Very clever Siemens style 8 cylinder engine
Replies: 1
Views: 89

Very clever Siemens style 8 cylinder engine

The cleverness of a Siemens engine is that uses the same bore twice which is more efficient. In https://www.youtube.com/watch?v=XsD8aI6nPV0 instead of a wobble plate, he uses 8 gears arranged in an octagon. Jump to 4:48 to see gears. How does this compare to a wobble plate design? A four cylinder co...
by cbstirling2
Thu Nov 09, 2017 4:33 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Thermo like propane engine
Replies: 2
Views: 119

Re: Thermo like propane engine

Looks like a Duplex brand beta-type Stirling

Perhaps a Chinese brand? I wonder if they were made in large quantities?
https://www.smokstak.com/forum/showthread.php?t=156942
by cbstirling2
Thu Nov 09, 2017 8:31 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Thermo like propane engine
Replies: 2
Views: 119

Thermo like propane engine

I saw this model engine on eBay listed for only 20 usd from China.
Looks propane powered and similar to the Thermo antique engines. I didn't buy as it seemed too good to be true. Anyone know about the engine?


https://www.ebay.com/itm/Hot-Air-Engine ... 2794495605
by cbstirling2
Fri Oct 27, 2017 7:54 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: New to Stirling Engines...where to start?!
Replies: 7
Views: 986

Re: New to Stirling Engines...where to start?!

There are many types of Stirling engines. Alpha, beta, gamma etc
Lots to read, but fun to learn
by cbstirling2
Fri Oct 27, 2017 7:49 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: First Sterling Finally Running
Replies: 12
Views: 506

Re: First Sterling Finally Running

Have the model be vertical with hot side down. Less friction.
by cbstirling2
Fri Oct 27, 2017 7:45 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: MY FINISHED MODEL Robert Stirling's Famous Hot Ait Engine
Replies: 8
Views: 229

Re: MY FINISHED MODEL Robert Stirling's Famous Hot Ait Engine

A YouTube video available? Looks awesome by the way.
As a test, maybe put a bead of playdough in the groove? I wonder if it would run faster or slower...

I didn't realize solder sticks to stainless...
by cbstirling2
Wed Oct 18, 2017 10:32 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: First Sterling Finally Running
Replies: 12
Views: 506

Re: First Sterling Finally Running

Of my Stirlings, the one that can run and run is an alpha in a V layout. This keeps the cold cold and the hot hot.

Gamma layout is a poor one. Alpha came later and let's face it. It is more advanced. Why monkey with poor designs?
by cbstirling2
Wed Apr 26, 2017 6:19 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Power producing low delta T state of the art?
Replies: 11
Views: 4146

Re: Power producing low delta T state of the art?

What was so revolutionary about your Stirling engine? You had a year to patent that but that timeframe expired long ago.
So you might as well share the idea.
Post a picture, etc.
by cbstirling2
Wed Apr 12, 2017 7:47 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Volum alfa model
Replies: 26
Views: 3074

Re: Volum alfa model

Very good looking model. Thinking the issues may be air leaks or friction... I worry about the wood sealing, I'd use hose instead. If you remove the transfer pipe, does the engine freely spin with almost no friction? While it madly spins frees, if you block the ports does the engine quickly stops? I...
by cbstirling2
Tue Apr 11, 2017 8:40 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Volum alfa model
Replies: 26
Views: 3074

Re: Volum alfa model

Please post a picture.
With the head vented, the flywheel should spend like crazy.
With the cylinder head sealed, the piston should not slide out on its own.
by cbstirling2
Mon Apr 10, 2017 5:54 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Reversible alpha model??
Replies: 2
Views: 766

Re: Reversible alpha model??

Lol, after sleeping on it, it's obvious! It's 90 degrees relative from the vantage of the heat side, so it doesn't matter.
I do suspect Superior cooling as well.
by cbstirling2
Mon Apr 10, 2017 5:50 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Volum alfa model
Replies: 26
Views: 3074

Re: Volum alfa model

As for low temperature, the phase angle matters: http://www.stirlingengineforum.com/viewtopic.php?f=1&t=2206 With a gamma Ltd, the cylinder volume between the hot and cold sides is the same as well since both are contained in the displacer cylinder. Since the pressure differential from LTD Motor...
by cbstirling2
Sun Apr 09, 2017 8:27 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Reversible alpha model??
Replies: 2
Views: 766

Reversible alpha model??

This model on eBay is marketed as reversible: 'Designed in Dual heating tube which works in "alternative" - when one tube is heating, another tube will work as radiation, it works in alternative and engine running in reversible direction.' It's a 90v alpha. Would the displacement offset 90...
by cbstirling2
Tue Mar 28, 2017 8:45 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heater & Regenerator Design
Replies: 61
Views: 8131

Re: Heater & Regenerator Design

Awesome! It would be interesting to try a few different phase angles to see differences in output.
by cbstirling2
Sun Mar 26, 2017 5:04 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Well I'll be damned!
Replies: 5
Views: 1194

Re: Well I'll be damned!

What are the dimensions? And I noticed that your piston has a much thicker amount of graphite and mine does. How did you connect your connecting rod to your piston?

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