Search found 280 matches

by Bumpkin
Fri May 05, 2023 10:11 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: [Translating resource] 100W class LTD Stirling engine( Lesson 5-3 )
Replies: 32
Views: 9343

Re: [Translating resource] 100W class LTD Stirling engine( Lesson 5-3 )

I’d like to have some confirmation of the test temperature ratio.The ratios are very interesting to me. I’ve been thinking, (assuming?) that the compression ratio should be about half of the temperature ratio. But I’m still not too old to either learn or get more confused.

Bumpkin
by Bumpkin
Thu May 04, 2023 12:03 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: [Translating resource] 100W class LTD Stirling engine( Lesson 5-3 )
Replies: 32
Views: 9343

Re: [Translating resource] 100W class LTD Stirling engine( Lesson 5-3 )

Hey Matt, I hadn’t noticed that 25-40 ratio — had to go back and find it to see if you weren’t hallucinating. It might be a misinterpretation or misprint, otherwise yes I’m surprised the engine runs at all at that temperature ratio. It would be working against itself as a heat-pump for much of each ...
by Bumpkin
Fri Apr 07, 2023 9:17 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: High temperature displacer
Replies: 191
Views: 80912

Re: High temperature displacer

Tom, I don’t know if this relates to your pursuit, but Ive been looking at open-cell metal foam for a high-temp regenerative displacer. Anyway I happened on this site which has some interesting links and data: https://ergaerospace.com/metal-foam-material/

Bumpkin
by Bumpkin
Mon Mar 27, 2023 9:31 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD Stirling Engine Development-Displacer Design
Replies: 51
Views: 24891

Re: LTD Stirling Engine Development-Displacer Design

Vincent, for light-weight high-temp insulation you might try carbon felt welding blanket. A downside for your purpose is that it’s permeable so it would add dead space. Actually I bought mine in hopes it might breath well enough to use as a displacer. (It doesn’t.) Anyway it’s a neat material; light...
by Bumpkin
Sun Mar 26, 2023 10:33 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: A New Type of Hot Air Engine
Replies: 121
Views: 19243

Re: A New Type of Hot Air Engine

Something I ran across that might relate or be thought-fodder for the topic a few pages back: https://go.gale.com/ps/i.do?id=GALE%7CA583382506&sid=googleScholar&v=2.1&it=r&linkaccess=abs&issn=17881994&p=AONE&sw=w&userGroupName=oregon_oweb&isGeoAuthType=true Bumpkin
by Bumpkin
Tue Mar 07, 2023 12:27 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: My contribution to the ECE
Replies: 120
Views: 18455

Re: My contribution to the ECE

Hey Vincent, it’s interesting that you’re looking at wood power and maybe using a 55 gallon barrel. I’ve got a barrel in my shop dissected and about ready for reassembly for the same purpose, to replace in the same foot-print my current shop-stove, and cogenerate a bit of charge for my solar battery...
by Bumpkin
Thu Mar 02, 2023 9:41 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My contribution to the ECE
Replies: 120
Views: 18455

Re: My contribution to the ECE

Sorry, Tom, looks like I dropped in right behind you and might have hidden your post. Some random thoughts: Vincent, you mentioned “no free lunch” with the magnetic actuation, I reckon that would apply to most all of the start-and-stop methods except maybe your desmo cam where just like a crank, the...
by Bumpkin
Thu Feb 02, 2023 9:50 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling Engine Thermodynamics
Replies: 251
Views: 103189

Re: Stirling Engine Thermodynamics

Hey Tom, if the engines shared the middle plate, longer screws could bridge from hot side to hot side and eliminate the thermal short of the fasteners to the middle too.
Bumpkin
by Bumpkin
Mon Jan 16, 2023 10:30 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Rider Ericson Hot air engine from casting
Replies: 1
Views: 1687

Re: Rider Ericson Hot air engine from casting

That is a really nice model. I don’t do much machining myself, except just enough to appreciate those who do. Mostly just weld and grind and beat on stuff. I have a lathe and such, but it hardly ever gets uncovered from the grime on the workbench. Thanks for sharing.

Bumpkin
by Bumpkin
Mon Dec 05, 2022 11:54 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Why can't I "just buy" a stirling engine?
Replies: 24
Views: 8129

Re: Why can't I "just buy" a stirling engine?

Here’s one we’ve been watching a few years — God I hate how I can’t seem to copy and paste anything lately — anyway go to “seftonmotors.com” I’m not touting them or not, but I think they’re real. Seems they’re behind on deliveries, but that’s good news for most kickstart endeavors. Bumpkin
by Bumpkin
Sat Dec 03, 2022 10:40 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: My first Stirling Engine
Replies: 3
Views: 2045

Re: My first Stirling Engine

I like that Boyd engine; and there seems to be more plans available there since I’s; well, it’s hell getting old.
by Bumpkin
Sat Dec 03, 2022 10:20 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: NASA Stirling Engines (Stirling "convertors")
Replies: 42
Views: 32140

Re: NASA Stirling Engines (Stirling "convertors")

Hey look, I posted twice in one day. (getting closer to retirement) Guess I’s somewhat bothered about this: “You make up lies about me, then claim I'm not credible based on your previous lies and misrepresentations.” Geez Tom, shi&, but OK— OK. if you can demonstrate my “lies” then have at it. I...
by Bumpkin
Sat Dec 03, 2022 11:44 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: NASA Stirling Engines (Stirling "convertors")
Replies: 42
Views: 32140

Re: NASA Stirling Engines (Stirling "convertors")

Tom, I appreciate how in a later post (Where do you get the time?) you demonstrate having come around to a lower, more competitive cost per watt for PV. So we can compare apples to apples and let the best apple win. I think we both root for Stirlings. I just want to be sure we keep fair score for th...
by Bumpkin
Fri Dec 02, 2022 10:36 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: NASA Stirling Engines (Stirling "convertors")
Replies: 42
Views: 32140

Re: NASA Stirling Engines (Stirling "convertors")

OK Tom, here goes. “If you want to run a Stirling engine off solar to produce electricity as a primary energy system it makes no sense IMO.” — I think you mean “P.V.” solar there and I totally agree, in fact it’s basic enough that I would probably leave off the “IMO.” “An electrical heating element ...
by Bumpkin
Thu Dec 01, 2022 9:43 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: NASA Stirling Engines (Stirling "convertors")
Replies: 42
Views: 32140

Re: NASA Stirling Engines (Stirling "convertors")

Well Tom, like I said this could get fun. Once again as is your wont, you took an example out of context to argue for the sake of getting the last word or defeating the evil “anything that isn’t a hot air engine.” So - I repeat, energy used INSIDE YOUR HOUSE during the heating season for other purpo...