Model Engine Maker
Help! => Specific Engine Help => Topic started by: Robert Hornby on February 18, 2022, 02:37:03 AM
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Some 25 or so years ago I made a cup of tea engine and subsequently sold it (that is another story). I wish to build another one but cannot find the original plans, so I am making it from memory. Please help with the ratio of displacer volume compared with power cylinder displaced volume, or is it not too important? By the displacer volume I mean the volume of the cylinder minus the volume of the displacer.
Robert
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Robert:
I believe the displacer to power cylinder volume is dependent on the temperature differential being exploited. The Low Temp Differential engines have a large displacer compared to power volume.
I'd suggest you look at some of Jan Ridders designs (http://www.ridders.nu/Webpaginas/pagina_overzicht_stirlingmodellen/stirlingoverzicht_frameset.htm). He may even have a design you could use directly. I've found him very responsive in sending drawings.
I'm making (turned into a very long term project) of a version of his "Egg Cup Stirling". The build log is on this site somewhere.
Let us know what you find. Thanks.
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There is this too:
http://animatedengines.com/ltdstirling.html
James Senft has designed many Stirling cycle engines
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Please help with the ratio of displacer volume compared with power cylinder displaced volume, or is it not too important? By the displacer volume I mean the volume of the cylinder minus the volume of the displacer.
Low delta Temperature engines, like the "cuppa model engines", typically have a displacer cylinder differential swept volume of about one hundred times greater than the power cylinder.
Jo
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Thank you very much for your inputs they help tremendously.