Search found 9 matches

by 7spoons
Wed Mar 11, 2020 6:46 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: SunPulse design references on the web
Replies: 5
Views: 9458

Re: SunPulse design references on the web

Thanks Rafik_A!

The link doesn't seem to cooperate so I'll fiddle with it here: steinhart.frank @ instagram
by 7spoons
Mon Mar 09, 2020 5:18 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Developing a 1000w generator based on approtechies' design
Replies: 32
Views: 46601

Re: Developing a 1000w generator based on approtechies' design

I agree, it does sound a bit low however I can't find an error in my math. According to the table 1g of steel holds nearly 1/2 joule per degree and 100cc of air holds about 1/8 joule per degree so yes, 100cc of air has about the same heat capacity as 1/4 gram of steel. Bizarre... I guess the good ne...
by 7spoons
Mon Mar 09, 2020 4:54 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: SunPulse design references on the web
Replies: 5
Views: 9458

SunPulse design references on the web

Thanks @danalinscott for the idea to put it all in one place! Here's a few links to documents that may shed some light on SunPulse engine design. Patent WO2016151401A2: https://patents.google.com/patent/WO2016151401A2 https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2016151401 Jürgen Kleinw...
by 7spoons
Mon Mar 09, 2020 2:16 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Developing a 1000w generator based on approtechies' design
Replies: 32
Views: 46601

Re: Developing a 1000w generator based on approtechies' design

I am also considering increasing the diameter of the hollow displacer piston core slightly to lower the dead space created by the steel wool regenerator material. I have not been able to find any ideal ratio of hot end to regenerator space. Is anyone reading this aware of one? My understanding is t...
by 7spoons
Mon Mar 09, 2020 12:39 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Is anyone working on LTD SunPulse-style engines?
Replies: 5
Views: 9394

Re: Is anyone working on LTD SunPulse-style engines?

My background is in computers and metal fabrication is more of a hobby. I weld and have access to a basic machine shop though no EDM or CNC for the moment. My initial impulse was to make a "toy" SP-style first, no more than a foot diameter, learn what I can and see if it inspires enough co...
by 7spoons
Sun Mar 08, 2020 7:23 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Is anyone working on LTD SunPulse-style engines?
Replies: 5
Views: 9394

Is anyone working on LTD SunPulse-style engines?

Hi guys, I'm looking for some homestead-appropriate stirling engine design that can be built with low-to-moderate skills and budget. SunPulse naturally grabbed my interest since they claim to not use advanced materials and yet reasonable efficiency. However, it appears that the team stopped all work...