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Clever. Does the heat need to be concentrated at one end of the tubes? I wonder if a wood fire could be applied along the tube heat exchanger. What watt output does it have? How long can it run? (Gives clues how well it dumps heat.) I wonder how much better it would run with cooling fins (with belt ...

Lloyd's thesis LOW TEMPERATURE DIFFERENTIAL STIRLING ENGINE FOR POWER GENERATION is a very good read that have tons numerical graphs and charts. One can find the PDFs by Google the title as mentioned. Another good PDF is by Normani From Lloyd's paper: Screenshot_2017-01-08-12-13-28.png See Alpha eng...

Been reading about them, Square wave movement matches more the actual cycle. The screenshot is from Lloyd's thesis paper. LOW TEMPERATURE DIFFERENTIAL STIRLING ENGINE FOR POWER GENERATION

Ian S C wrote: I built this one and another one that is a Ringbom motor, similar lay out, but it is too noisy, and it is actually too powerful.
Ian S C

So the ringbom is more powerful than the gamma? Is generally true?
Also why is it "too powerful"?
Do you have pictures of the Ringbom motor?

Ian, thank you for your insight. I see several things to try: 1. Run the engine vertical as a test. 1a. I suspect it would be best to have the displacer dangle rather than be on top. Although if I make a new stand I'd have to redesign the propane nozzle. 2. Remove a flywheel. (Easy to slide off.) Th...

received_10211821820161421.jpeg To clean up the engine ended up taking a lot of it apart. One thing that I learned is that would never build an engine this way. The crankshaft assembly in my opinion is way too heavy. A shared crank with a 90 deg offset would be far simpler and more performance. Als...

https://youtu.be/C5dTOb_-kCk

I got the engine, is in dire need of a tune-up as the oil was Gummy and one of the bearing blocks was rubbing a bit.

http://airpot.com/product-category/prod ... nder-sets/
This needs to bumped to the top!

Looks like the machinist made a steel cup and then screwed in a brass piece.
The crank shaft design is interesting. It is a steel bar about an inch diameter.

As before, I am curious to lubrication requirements

On the power side, the cylinder is lined with a thin magnetic sleeve. (Steel I presume) The piston itself is more difficult to determine. I think it is steel as well since a little magnet sticks as well. On the inside of the piston there is lamp black. Ian, what do you recommend for lubrication when...

Rich, I hope you publish your results. Any thoughts on snifter design?

I have seen some builders thermally isolate the hot and cold halves of the displacer so the mass of the displacer acts as a regenerator. So think 2 cans glued together with insulator in middle. In order to allow for pressurized engines, I've read that some builders put a pin hole in the displacer. C...

In Andy Ross's book he mentions that he tested phasing from 60 degrees to 180 degrees with interesting results at narrower angles the compression became higher and more difficult to start and required higher temperatures even to run. But when it did run "it did so with great power and speed&qu...

I have the same book,. Just arrived today. It is one of the best books I have read in a long time and am excited about the crank system. Trevor Where does one find a reasonably priced version of Rizzo's book? "The Stirling Engine Manual vol 1" $90 from amazon is too steep... In this write...