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From the book Amateur Work Three (3) from 1904! Published by Draper Publishing Company

Oops! you are correct, not in production

https://www.stirlingengineforum.com/viewtopic.php?p=2118#p2118 Doing research ahead of time is always good, and...at the same time, I place a high value on real-world experiments that will expose issues that weren't thought of during the planning stage. Here's a simple gamma from 1904 with a record...

I don't think there is a lot of profit in making Stirling engines for sale to the public. There is no way to patent any part of it, so a premium price cannot be charged to early-adopters. Even if someone tried to make and sell them...who would buy it, and what would they use it for? One possible ans...

Thanks again, Matt! Lots of good info to study.

Thanks, Matt. I appreciate you taking the time to post that. It is very helpful to me!

Per "Ian S C" in New Zealand...https://stirlingengineforum.com/search.php?st=0&sk=t&sd=d&sr=posts&author_id=1424 Displacer should be near three times longer than its diameter, with the warm walls of the displacer acting as a mild regenerator Working gas volume in displacer-...

Thanks Tom Booth and VincentG!

I'm hoping to gather the common thoughts on optimum diameter-to-length ratios and also volume ratios between the big three components on a Gamma. Power cylinder (bore/stroke), displacer cylinder, and displacer. For instance, a low-temp-differential Gamma (LTD) displacer-cylinder has a wide diameter,...

I forgot to add from the Andy Ross book...he did use a long power-piston with the seals/rings at the base instead of the crown (as mentioned before in this discussion), and one interesting bit is that the piston itself can absorb heat which travels down the sides of the piston, which adds heat to th...

From "Making Stirling Engines" by Andy Ross (3rd ed. 1997) pg 11, the 65cc rhombic was rebuilt...Its friction was low and its seals were excellent. Both the piston and the displacer used two-cycle engine racing·type piston rings, which are thin chrome plated steel rings with very low outsp...

jpigg55, I've never heard of Clupet rings before. Now that I've seen them, I don't know why they aren't more common! Thanks.

From VincentG... "...For what it's worth, the Essex mostly solved the hot piston sealing issue. The piston dome was thin brass and only .015" or so smaller than the bore, but protrudes up a few inches, preventing the majority of the hot gas from reaching the piston sealing area...." T...

Thank you, staska!

I am curious about the current "go to" piston ring for a large working Gamma. The small brass desktop demonstrators seem to have no seal, or use a rubber O-ring. The 1880's Rider-Alpha used leather seals that were lightly oiled, and the design simply accepted a certain amount of air leakag...

Thank you both for the thoughtful replies, you have given me much to think about. Matt, I am near retirement and I've been shuffled by management into a maintenance position where I do a lot of grass mowing in the warm months on a riding mower. Nice gig if you can get it. When pondering the Wilcox e...