Excellent job Les, I'd never heard of a Rhombic drive system before, fascinating. It took me quite a while and some research to figure out how that mechanism works, thanks cheers Paul
Hi Les! Nice model, quiet running, excellent workmanship. Interesting that you had to reduce the diameter of the power piston to make the model run. Turns out that the smaller the temperature difference between the hot and cold ends of the engine, the smaller the power piston diameter wrt the displacer cylinder bore. Look up Ultra Low Temperature Stirling Engines to see how tiny the power piston diameter is compared to the displacer cylinder. As the temperature difference gets greater the power piston increases in diameter until it is the same diameter as the displacer cylinder. I built a rhombic drive engine a long time ago and it has this 1 : 1 ratio between diameters, and It needs to be really hot before it begins to run. I built a ring burner to heat the hot end to about 1600 deg. F and, with helium for a working fluid it produced about 130 Watts mechanical power from a 13.5 CC displacement engine. I had connected the garden hose for reliable cooling, as the heat input was tremendous. I don't know the efficiency of my model, but assuming 5% the energy input was 2600 Watts thermal equivalent. After 10 years of experimentation I stopped investigative work because the engine became too complex for serious power outputs. For purely display purposes the simple model you built, and the one shown on my channel running the portable radio, are perfectly adequate.
Hi, thanks for the comment. It would have been impractical to get the temperature high enough to get the engine to run with a one to one ratio. The smaller power piston is find for a model who's only purpose is to run and not power anything. I will check out your stirling engine. It sounds interesting.
@@LeslieProper The rhombic drive engine is not on my channel as it has been inoperable since the last run with Helium. Sorry. If you really would like to see it I could post some still pics.
no, that's okay. I remember your RUclips channel from years ago when I was try to come up with a reversing mechanism for my tiny multi cylinder steam engines. I found your steam engine with the Maudslay gear. You gave a very good explanation of how it worked and I use the information to build a few different ones on my tiny steam engine. You should check them out (ruclips.net/user/LeslieProper) as you provided the info and inspiration. @@BasementEngineer
what's the chance of them running on heat friction they themselves would generate gently dragging a brake? If it gets hotter its go faster making it hotter , long as your brakes spring loaded so it never fully locks from expansion....they'll need a starter motor to reach temperature...could it work?
Are you interested at all in selling these lovely engines? It's really difficult to find quality beta stirling engines for sale currently, and I would love to own one.
square this up Leslie. Big bore pcp umerex hammer 330gr cast 50cal slugs around 970 - 1000fps..5shots per fill 4500psi.. 338lapur magnum *240gr 2900fps 65,000psi* peak gas chamber pressure. Now give the airgun 65,000psi to play with.....you see the problem.?
Sweet little engine Les. you know everything is in harmony when they take off and run that easy and that smooth. Have you given any thought to the Manson engine? Just curious. Thanks for sharing!~Paul
Thanks for the comment. I have started to look at the Manson engine since you mentioned it. It is new to me. I just might try to build one in the future.
Excellent job Les, I'd never heard of a Rhombic drive system before, fascinating. It took me quite a while and some research to figure out how that mechanism works, thanks cheers Paul
Hi Paul, I didn't know if I would be able to build it. There are a lot of parts that need good precision or the piston will bind.
Hi Les! Nice model, quiet running, excellent workmanship.
Interesting that you had to reduce the diameter of the power piston to make the model run.
Turns out that the smaller the temperature difference between the hot and cold ends of the engine, the smaller the power piston diameter wrt the displacer cylinder bore.
Look up Ultra Low Temperature Stirling Engines to see how tiny the power piston diameter is compared to the displacer cylinder.
As the temperature difference gets greater the power piston increases in diameter until it is the same diameter as the displacer cylinder.
I built a rhombic drive engine a long time ago and it has this 1 : 1 ratio between diameters, and It needs to be really hot before it begins to run.
I built a ring burner to heat the hot end to about 1600 deg. F and, with helium for a working fluid it produced about 130 Watts mechanical power from a 13.5 CC displacement engine. I had connected the garden hose for reliable cooling, as the heat input was tremendous.
I don't know the efficiency of my model, but assuming 5% the energy input was 2600 Watts thermal equivalent.
After 10 years of experimentation I stopped investigative work because the engine became too complex for serious power outputs.
For purely display purposes the simple model you built, and the one shown on my channel running the portable radio, are perfectly adequate.
Hi, thanks for the comment. It would have been impractical to get the temperature high enough to get the engine to run with a one to one ratio. The smaller power piston is find for a model who's only purpose is to run and not power anything. I will check out your stirling engine. It sounds interesting.
@@LeslieProper The rhombic drive engine is not on my channel as it has been inoperable since the last run with Helium. Sorry.
If you really would like to see it I could post some still pics.
no, that's okay. I remember your RUclips channel from years ago when I was try to come up with a reversing mechanism for my tiny multi cylinder steam engines. I found your steam engine with the Maudslay gear. You gave a very good explanation of how it worked and I use the information to build a few different ones on my tiny steam engine. You should check them out (ruclips.net/user/LeslieProper) as you provided the info and inspiration. @@BasementEngineer
what's the chance of them running on heat friction they themselves would generate gently dragging a brake? If it gets hotter its go faster making it hotter , long as your brakes spring loaded so it never fully locks from expansion....they'll need a starter motor to reach temperature...could it work?
Are you interested at all in selling these lovely engines? It's really difficult to find quality beta stirling engines for sale currently, and I would love to own one.
Sorry, I am not interested in selling any engines.
Great model Les, loved your review 😀
square this up Leslie.
Big bore pcp umerex hammer 330gr cast 50cal slugs around 970 - 1000fps..5shots per fill 4500psi..
338lapur magnum *240gr 2900fps 65,000psi* peak gas chamber pressure.
Now give the airgun 65,000psi to play with.....you see the problem.?
Hi, is there an air pump capable of attaining that high of a pressure? I would not want to be within 100 feet of it, if there is.
Sir, is your book still available? I know it deals with steam engines and not Stirling engines, just trying to get a copy, thanks Gregg
Send your email to lesproper@gmail.com and I will send back information on my steam boat book.
Nicely made and a good little runner - thanks.
Thanks. It is nice to receive position comments on my engines.
Sweet little engine Les. you know everything is in harmony when they take off and run that easy and that smooth.
Have you given any thought to the Manson engine? Just curious. Thanks for sharing!~Paul
Thanks for the comment. I have started to look at the Manson engine since you mentioned it. It is new to me. I just might try to build one in the future.