I just dropped the price of
the permaculture playing cards
for a wee bit.

 

 

uses include:
- infecting brains with permaculture
- convincing folks that you are not crazy
- gift giving obligations
- stocking stuffer
- gambling distraction
- an hour or two of reading
- find the needle
- find the 26 hidden names

clickity-click-click

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Finally a Stirling Engine available for Order  RSS feed

 
Justus Walker
Posts: 69
Location: Siberia
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I've been waiting for this for a long time. It doesn't "look" like an engine, but it is an engine! A stirling heat engine. And the price, although high, is way more reasonable than anything else I have ever seen!!

http://seftonmotors.com

Comments, thoughts. I want one!!!
 
allen lumley
pollinator
Posts: 4154
Location: Northern New York Zone4-5 the OUTER 'RONDACs percip 36''
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I have only taken a brief look and already I have an issue with their Unit labeled '' Fire box wood '' ! The ''Operating Temperature " listed for their Internal Burning Stack

is 1200ºƒ but the picture shows a metal square tube with minimal insulation held inlace by some kind of wide metal banding ! In this location, at those temperatures -



METAL IS DOOMED

This lack of basic understanding of how the rocket stove works does not impress me !

A couple more links below :


https://www.youtube.com/watch?v=lWGGtRpK4x8

https://www.youtube.com/watch?v=dNeOXsVdShU


It might be informative to find out about their appearance at the Greenville Makerfaire !

Just my two cents !

 
Justus Walker
Posts: 69
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Their firebox is lame. Agreed. But the engine itself. I wouldn't use one of their fireboxes anyway.
 
Troy Rhodes
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They look a little primitive. Not always a bad thing.

They use PTFE rings, which will require a very smooth bore in the cylinder to have any decent lifespan. Without running at elevated internal pressures, the output will be more like 100 watts rather than 1,000 watts.

Running pressurized is tricky to get done in real life.

There could be lifespan issues depending on exactly how hot the hot end gets.

The cold end looks air cooled, which has pros and cons. Water cooled will give a bigger temperature delta, and could be passive. Active cooling of either kind sucks up power if not done super efficiently.

Hey, they have actual stuff for sale, with actual running engines to look at and bigger than a toy. This already puts them head and shoulders above every other Sterling engine out there.
 
Steve Farmer
Posts: 401
Location: South Tenerife, Canary Islands (Spain)
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Baxi have for some time been offering a sterling engine built into their central heating/hotwater boilers, to generate electricity from the heat your boiler is producing anyway.

While not as flexible as the sefton "any heat" system, the baxi appears to be very good in the scenarios for which it is designed. If you want to use a different heat source, then I guess their sterling engine can be separated from the boiler by an engineering hack, or better still someone might know who manufactures the sterling engine inside and whether it can be supplied separately.

http://www.baxi.co.uk/renewables/combined-heat-and-power/ecogen.htm
 
I agree. Here's the link: http://richsoil.com/cards
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