Search found 156 matches

by cbstirling2
Tue Jan 03, 2017 6:50 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Book about striking engine design
Replies: 18
Views: 16842

Re: Book about striking engine design

The crank angle is automatically set by the yoke, it's not 90*, but seems to work ok, I did see the angles somewhere, but can't remember. Ian S C Ian wrote on another post: "All of my BETA and GAMMA motors are set at 90*,the ALPHA motor is a Ross Yoke type, and the angle is somewhat different,...
by cbstirling2
Tue Jan 03, 2017 5:38 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: What are the challenges for making an engine that does real work?
Replies: 18
Views: 14463

Re: What are the challenges for making an engine that does real work?

If one used a magnetic clutch, one could completely enclose the stirling engine with the only seal being the Schrader valve. The benefit here being good being no seals against a moving shaft, so that be very simple I would suspect. Has anyone tried this? Looks like someone patented the idea back in ...
by cbstirling2
Tue Jan 03, 2017 9:43 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Alpha type stirling engine Problem
Replies: 8
Views: 7496

Re: Alpha type stirling engine Problem

Ian, what do you think is a lifetime of a graphite piston? What about Teflon?
by cbstirling2
Tue Jan 03, 2017 8:07 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Plans for powerful Stirling engines
Replies: 5
Views: 7082

Re: Plans for powerful Stirling engines

The link went to Mini-Ecoboy. Which does not show the picture that you posted. Also that engine has helium as the working gas. That would make the engine extra complicated. I read it be better just to use regular compressed air like the ST-5.
by cbstirling2
Mon Jan 02, 2017 10:46 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: What are the challenges for making an engine that does real work?
Replies: 18
Views: 14463

Re: What are the challenges for making an engine that does real work?

I can't find the site, but there was a motor (?5hp)designed in USA to be built in Bangladesh from locally found materials, and be fueled with rice husks, there is also a book about it. Ian S C Be warned, there are actually two engines involved surrounding that book. The book was written by someone ...
by cbstirling2
Mon Jan 02, 2017 10:31 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling Engines are difficult to analyse
Replies: 6
Views: 5694

Re: Stirling Engines are difficult to analyse

Is there a URL to a Dalhousie university team report that claims that dead space does not impact performance?
by cbstirling2
Mon Jan 02, 2017 6:56 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling Engines are difficult to analyse
Replies: 6
Views: 5694

Re: Stirling Engines are difficult to analyse

I too have seen the YouTube video where he talks about the dead volume to control the speed of his motor. However in thermal acoustic engines, a lot of times there needs to be a vast amount of space to set up the oscillation. So this is just a thought, but on that gammaxengine when the professor use...
by cbstirling2
Mon Jan 02, 2017 8:28 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Got a used larger hobby engine, start up prep?
Replies: 14
Views: 7764

Got a used larger hobby engine, start up prep?

I recently acquired a gamma engine built apparently by a machinist. (It's being shipped to me.) What should I do to prep the engine? Was planning to clean up the old oil and whatnot with gun cleaner spray. For the power piston bore I was planning to lubricated with dry graphite. For the linkages was...
by cbstirling2
Mon Jan 02, 2017 7:57 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Alpha type stirling engine Problem
Replies: 8
Views: 7496

Re: Alpha type stirling engine Problem

I think he's looking for a ballpark advice.
I don't know much about alphas, with head off, your engine must spin very freely.
On one of my models was running poorly, so I lubrication with graphite and now it runs really good. I suspect those motorcycle Rings might be a problem.
by cbstirling2
Sun Jan 01, 2017 7:26 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine , now it runs on alcohol stoves ! Special thanks Lan SC !,
Replies: 10
Views: 7551

Re: My stirling engine , now it runs on alcohol stoves ! Special thanks Lan SC !,

thanh-cuibap wrote:https://www.youtube.com/watch?v=Kn3ZidE ... e=youtu.be
now it runs on alcohol stoves
What material do you use as an insulator between the hothead and the cooler side of the displacer cylinder?
by cbstirling2
Sun Jan 01, 2017 7:25 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine , now it runs on alcohol stoves ! Special thanks Lan SC !,
Replies: 10
Views: 7551

Re: My stirling engine , now it runs on alcohol stoves ! Special thanks Lan SC !,

Hi Thanh, Just seen your video. A beautifully made machine. Just wondering, have you ever considered also building one that can be used to perform real work in rural settings? I know this isn't a reference to a stirling engine, but maybe 4 cycle engine could be ran on a wood gasifier? I've seen tha...
by cbstirling2
Sun Jan 01, 2017 7:14 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: A Timing question
Replies: 8
Views: 9084

Re: A Timing question

All of my BETA and GAMMA motors are set at 90*... [img] FXYLK5KHO236DGO_MEDIUM.jpg [/img] From the sounds of it, you did that experimentation and found that 90 degrees is best anyhow? From your own experience, do you ever think that a variable timing would be useful? Also one more question, from wh...
by cbstirling2
Sat Dec 31, 2016 10:40 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Snifting valve
Replies: 30
Views: 17779

Re: Snifting valve

Ian S C wrote:If you put too much heat under a LTD motor like mine you get melt down, my one has a foam plastic displacer, and it doesn't take much to melt it.
Ian S C
Let's say an Ltd made out of stainless. If you apply more heat than expected, doesn't the extra pressure slow the engine down??