The Stirling Engine Project

We explore the design of a 3D printed, water-cooled, rhombic drive Stirling Engine, and the addictive and complex process of its optimization.
Episode #2:
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[@dfunited1]

"Without a way to quantify engine power, you're just jerking off in circles". That's one way to put it. Subscribed

[@newoldbrain]

How this channel hasn't got a hundred thousand subscribers is beyond me. Thanks Leo for your videos, and even more for your passion.

[@integza]

This is just an amazing design! Thank you so much for sharing the project with us! Are you sharing the 3D model files? I would love to print one for me.

[@KimSeiji]

huuuummmm NICE. If you build this, you should paint it TOMATO-RED.

[@leosbagoftricks3732]

E-mail me

[@daylenhigman8680]

@@KimSeiji tomato crusher

[@JoshuaJoshua0]

frozen tomatoes powering a stirling engine tomato chopper

[@patrickfle9172]

The red sealing compound reminded me of you :D

[@gmeast]

I've been a Sterling fan since I was 12yo. I'm 69 now and still a fan. A Regenerator actually is very important for the overall thermal efficiency of the engine. Why I never thought of a Displacer/Regenerator combo' is beyond me. It helps to address the 'dead volume' issues associated with a dedicated, external regenerator and associated plumbing. Great Work!

[@quatrebillesblanches6442]

Je réfléchis à un bicylindre pendulaire avec deux grosses bouteilles d'oxygène et un des déplaceurs remplis de tores de cuivres . Je voudrais entrainer un volant d'inertie.

[@rogerdueck9725]

Love this video, it perfectly explains my thoughts on the sterling engine. I live in Canada where it gets to -35° Celsius for a couple of weeks a year and inside we have a fireplace roaring. I've always thought a sterling engine attached through the wall from the fireplace to the outside would produce quite alot of energy. Keep going with the project, can't wait for an update!

[@benderrodriquez]

After seeing this, I feel my life won't be complete if I do not build my own version.

[@StirlingLighthouse]

Do it! It's a lot of fun. 👍

[@danieljones317]

If I got that bug, I'd probably have to make one that would power a generator, and not a small one, either!

[@BobWidlefish]

Your life is not complete and will never be complete until and unless you finish yours.

[@kozmicre982]

Ray Id like to do the same but Id wind up using the coke can and paperclip model lol! It works Would be something Id like to experiment with using it to power a bicycle if it can be applied. I never tried but recently have curiosity rising so I'm researching it here soon.

[@williammartinez3392]

I relate!

[@StirlingLighthouse]

The stirling bug bites hard. Lol I just love the whole idea in these amazing engines. Your take on it is very nice! Cheers

[@gammaleader96]

I like how you use whatever seems to do the job without staying at conventional materials and techniques. Looking forward to what this engine evolves into.

[@reynaldomartinez7978]

Your sterling engine design is unique from other sterling motors. Your on to something of immense value to all mankind. The is ready for simplicity. I wish you well in your endeavor. Live long and prosper 🖖.

[@jamesmaclean2]

Wonderful ! I have been building Power Stirling engines for 40 years, & never thought of a Plastic Body! Genius!! I also use thin Drawn Stainless Steel "Cups" most flour & sugar "Dredges". My Hot End gets Red Hot and I attach it to the threaded Stainless cylinder ring with brazing. I used to use JB Weld where you are using the Silicone. Great work & Thanks for show it to us!!

[@PALM311]

I completely understand your addiction and I completely understand your need to build these engines. Around 15 years ago I saw my first Stirling engine and it immediately transformed me into something I didn't recognize.....and I have never looked back. The addiction has become so strong I bought a Bridgeport a lathe and a plethora of other machine shop tools. My background as a machinist also came into play. I live for these engines.. well that and metal detecting. But these engines are certainly at the forefront of a lot of my free time. I live in the snow belt so I have a lot of time to work on these engines when I can't swing a detector. I have to say that your engine is absolutely beautiful! you did a fantastic job on it. That is an engine that any builder would be proud of! You'll get the bugs worked out of it, that I'm sure of. These engines look so simple and so easy and yet they're extremely complex as you were saying. I made the mistake of thinking it was a cakewalk making one of these engines and I failed miserably again and again because of that. I didn't give these engines the credit and the respect that they deserved on the onset of building these and I paid for it with failed end product.

[@joecobra48]

Underrated. Thanks for outlining the psychological pitfalls.

[@propylaeen]

What an elegant design. Could help looking deeper into 3D-printed ceramics or some aerogel parts to deal with thermal issues. Very good editing style! Thank you for sharing.

[@donk.5730]

I am more impressed with your ''stick-to-it'' attitude more than the actual engine. Thank you for the factual , no nonsense , very helpful project. Keep on , Sir. !!!

[@celalergun]

What an entertaining and educational video! Thank you for sharing your experiences with us. I really appreciate it.

[@diretodotuneldotempo8495]

Congratulations, you make a fantastic job!! I have seen a lot of Stirling engine videos at internet but yours shows a trully revolution at the area!! Making the cold side of engine with plastic material will keep the cost of equipment achieveble by the majority of people!!

[@AttilaBlade]

Good to see your engine in working condition. The regenerative displacer is one of the biggest challenge I think. Low friction, good volume of steel wool, but the stainless steel better for this, and the low as possible leakage. I mean the displacer leakage how big portion of gas not goes trough the regenerator section. For a long time usage the cold side plastic part should be shielding from the hot side with a trap for the flame also some high temp insulator blanket between the surfaces. Are the gears in good condition? I will follow your work, because it is so detailed and precise. I like to use 3D printed parts, but actually mine doesn't work well. So keep up the good work! Congratulation! BLADE

[@leosbagoftricks3732]

Thank you for your detailed observations- I am going to work on that displacer/regenerator part, along with building the dynamometer to evaluate the results. So far the mechanical drive train seems to be holding up to the job.

[@jimgraham6722]

Yes, in my experience steel wool displacers catch fire at higher power settings. Stainless mesh tends to worker better but is harder to work into shape.

[@ManualdoMotorStirling]

Very nice to follow the construction of your engine and I am happy that you visited my channel. Really, what is simple about a Stirling engine, it is not at all simple to get good results, the amount of challenges that the engine presents, is addictive. Let's see your dynamometer, I always wanted to make one, it will be a pleasure to see your walk.

[@leosbagoftricks3732]

Thanks! I am in the middle of the dyno project now- as usual, I am going too far...

[@ДмитрийДеревянченко-б8к]

@@leosbagoftricks3732 pla plastic will go

[@Random_How-tos]

This is the most awesome thing I’ve seen in a long time.

[@JimNichols]

Thanks for the ride along and the video! Making these is difficult and sharing your experiences is a very caring act. Thanks again Leo!.

[@colinellicott9737]

Love this subject. Designed a Sterling engine 40 years ago - wow - that was tough to type. Have had a warm place in my heart for them ever since. The Reverend was a phenom. Check out the Philips Stirling engine. Cool stuff.

[@EvilMrMahler69]

Thanks be to youtube algorithm for bringing this one up. Amazing design, you are lightyears ahead

[@sp277]

Great video, Leo. Congratulations. I love Stirling engines since the 80s. Without the Internet, the most I could get was to find a great technical book about them in the university. There was little material information to get about Stirling engines. I remember that when the Internet was initially fledgling, to "test" how was it: the very first query that I submitted was precisely "Stirling engine". I still remember the feeling of getting all that information! Wow! Internet was great if it could easily get all that info about a theme that was so "difficult" to know in those days.

[@eddiesines3398]

Loved this presentation.. I built one way back in the 1970's and yet the rabbit hole was very deep... Great engineering!

[@NeilStainton]

Well done on your brilliant design. I built a small eddy current dynamometer about 20 years ago for characterising small electric motors. However the interesting thing about a sterling engine is its efficiency, not is power output which is low. So measuring the output power of your engine in its current configuration is pointless, because you cannot measure the power in, and therefore you cannot optimise it. You probably need to change it so the power in is through a electric heating coil, then you can measure Watts in and compare that with Watts out.

[@blk77sunshn]

This was very fascinating! I wholeheartedly enjoyed your video ! Your Stirling engine has to be one of the most unique I've seen to date. Thanks for sharing.

[@derrickboatman1560]

I have been fascinated with Stirling engines for many years. never tried to build one I think I may have to now. Great video, you got a new subscriber

[@tleitch6360]

Subscribed and Liked. Really like the way the information is presented. More logical and better explained than lots of other channels. I hope you will continue this project and go into the actual power output across temperature ranges. One thing that did occur to me was the use of a passive water cooler using the heat difference to induce flow. That would, for me, be an intersting addition to the project.

[@jimkelly4372]

Hello, Leo, Excellent videos! I will be watching more of them. Keep up the great presentations!

[@thecrikster]

That must be so satisfying when you hand crank that engine and it starts up :D

[@leosbagoftricks3732]

I was high for 2 days!

[@michaelgardner1681]

Hey Leo, this is the first Stirling engine video I've clicked on. Thanks for the addiction warning. I haven't watched your other two yet so maybe you have already employed the MPD-L1060 in your dyno design. I found brushless motors to be an excellent load when used as elecrical generators. If you mount them to be rotatable about the shaft axis and measure the torque with a strain gauge you can get a very dynamic data set that is easy to read with microprocessors. The speed is easy to pick from the output voltage waveform.

[@awizardman]

man you made me stay the entire video, great job!

[@yogimarkmac]

Several years ago I got sucked into Tim Sefton's Kickstarter Stirling engine project. Got nothing for my several hundred dollars. It's the technology that's always just out of arm's reach. I developed a heliostat prototype hoping to eventually be able to run a Stirling engine off of solar power, but never got a practical engine to try it with. Keep the flame alive brother.

[@josephhayes6071]

You got my like and sub around the "Addiction" part of this video, lol. Glad to know I am know the only one who became fascinated and feel they must build one.

[@sethg6157]

It's criminal that you only have 3k subs! This is amazing!

[@zinahe]

As always, your projects are worth the waiting, well-thought-out and very informative. Thank you for sharing.

[@leosbagoftricks3732]

Thank you very much!

[@DaveWeagle]

You are right about that trap! I feel like many an engineer has spent their career searching for the answer to stirling engines and CVT's. My mind has been on this for 20 years! I like the next step of measuring. Please show that dyno build!

[@tdumnxy]

Really enjoyed this video. Good luck!

[@BogdanTheGeek]

For the dyno I would suggest using an electromagnetic break system(a tube within a tube with iron powder between them and an electromagnet in the center tube would do the trick) with a load cell to to get the torque, but I cant wait to see what you come up with.

[@onestoptechnologies7305]

Could he use an off the shelf DC micro motor connected to a variable resistor with an ammeter?

[@synapticaxon9303]

You're sucking me back into my old stirling engine obsession. :) But if you could maybe create a github repo with your fusion360 and/or stl files, you could get some contributions from nerds like me. Help us, help you, help everybody. Thanks man!

[@ravener96]

Do you happen to know how you get high pressure working fluids working? I always wondered how you get the power piston working since the gas behind it has to be a similarly high pressure

[@onestoptechnologies7305]

@@ravener96 I'm not totally sure I understand your question, but I'll take a stab... It has to do with the large surface area of the top and bottom of the displacer coupled with the localized change in pressure due to temperature.

[@kr6dr]

I designed a simple dynamometer that has a mountain bike brake rotor mounted to the shaft and an arm supported by a bearing on the shaft which has the brake caliper mounted to it. The arm is linked to a small hydraulic cylinder. The length of the arm and the diameter of the hydraulic piston are such that a pressure gauge will give a direct read-out of foot pounds of torque in pounds per square inch. I am hoping to build a Stirling engine that is light enough to power an aircraft. Thank you for sharing your work. It is inspirational!

[@HoffmanTactical]

I've been thinking about 3D printing one as well, you have done an incredible job!

[@hopsgarage5513]

Very cool, and it sounds great. I remember reading about a Army project for a sterling engine generator, something like 30kw with a swash plate crank. They used helium for the working gas but it kept leaking out. Keep up the great work

[@chloeeqzi]

Leo: Man you are getting really good at this. Nice production value and easy to follow commentary. I like the window into the mind of Leo and how you make decisions. Have to call you for questionable use of the word Sexy as it pertains to any part of this project. I am grateful people like you find this stuff addictive so I can do my part for the world and watch South Park. Please save me a space on the exit pods near you. I’m afraid I will be eaten by the locals for having mostly useless skills when push comes to shove. More projects please.

[@gusmartin6053]

These engines are fascinating to me as well! I tend to like the variations that are capable of running on low temperature differentials. They run beautifully smooth and suffer much less from melting and oxidizing components (provided you don’t try to over clock them). The big challenge with them is reducing friction as much as possible. That’s very difficult with so many moving parts. Great video! I suffer from the same obsessive behavior, but it’s so much fun so I wouldn’t have it any other way.

[@HyperspacePirate]

The thermal isolation with this thing is super impressive

[@fuelban]

Excellent video, totally captavating stuff.... Thanks ..... Thom in Scotland.

[@mike87364]

dood this is amazing

[@johngillon6969]

I have been wondering just how many stirling engines there must be out there. I am starting on my third engine. I built one that i remember seeing when i was 10 in a popular science magazine 1960 . I found the article on the internet, and after 62 or so years of yearning to build one i did. These are wonderful toys for 74 year old dudes to play with, in my opinion.

[@novanut1964]

the displacer shape reminded me of a Sloan toilet/urinal flush valve inner parts, great video

[@leofortin912]

Hi, Leo this is another Leo. I have build a stirling engine and fussed with a displacer. Idea I came up with was to use course steel wool as there are more air gaps than fine which allows for better heat transfer between between hot and cold strokes. I also used small pieces of 1/4" mesh screen and very thin large washers to capture the course steel wool and form the displacer piston.

[@leosbagoftricks3732]

I would love to see a photo of this assembly!

[@gotbread2]

I can relate to this. From time to time I also have the urge to build one. Sadly I don't have the manufacturing capabilities so I got a small teacup version and like to watch it

[@StirlingLighthouse]

I had the same issue. Limited tools and equipment. But that didn't stop me from trying. I just used what I had and the satisfaction is priceless.

[@TheWindGinProject]

Thanks for sharing. All points made were spot on and I agree 100% regarding the warning of how a Stirling Engine build / design is going to be very addictive for those with mechanical interest. Yes it does seem fairly straight forward at first glance. :-)

[@mbunds]

That's a beautiful build! Thanks!

[@maxdelaserna9540]

Amazing and beautiful Sterling engine. Great job.

[@SalarKhan-j6m]

Hey Leo! thanks for the amazing vid. I really think with the level of execution you have done, you should attempt building a thermoacoustic sterling engine its even more simple.

[@Julian_Kulenkampff]

Thanks! Awesome engineering always :D I cant wait to see more contend like this.

[@StofStuiver]

Nice vid m8. Immediately voted up when you warned about stirling engines addictive properties. ;]]

[@tomwilliams2753]

I too am afflicted but with an Alpha....really enjoyed this presentation....subscribed....looking forward to the dyno project. I would like to be able to measure the mechanical output once my engine is optimized.....I agree that Stirling Engines are addictive and mentally stimulating.....thanks for sharing your work.

[@leosbagoftricks3732]

Glad you liked it! more to come!

[@lorinczhuff2022]

Thank you for telling/reminding me how to get access to more of your content and the work of other wonderfully creative - technical minds like yours's. "Subscribe, hit the like button, write a comment." In turn you give an older technical person the stimulation I need to push me towards doing something really cool myself. You are one of my hero's, and I am happy when I watch your excellent content. You mentioned owning a decent 3 - D printer. Would you mind sharing the name, year, make, and model of your printer ?

[@avramitra]

As always, great content. Waiting for the improved version of your Stirling Engine.

[@shanemiller6947]

Hello buddy wanted to tell you you have the very best engine build on the KZbin trust me iv watched them all thanks for you tinkering on this project I'm going to try my best to run with you on this project design iv never seen anything as nice as this setup very well achieved keep going with this I'm wanting to see someone use this engine to do something cool a fan or some kinda of electric generator needs a good use for this engine thanks your new friend Shane

[@derekbrn]

Fantastic - super interesting project and well-done video as usual. Keep it up, proud to be a Leo Fan Boy!

[@minercraftal]

That’s crazy! To make a pla 3d printed engine really run on heat transferring!!! Excellent job and idea!! I never thought this way before!😂 And now, it’s time to make an EXTRA big size engine now!😂

[@Asyss_Complex]

This is so satisfying to watch. Thanks for sharing!

[@leerman22]

That regenerator/displacer is really cool. It would work wonders with helium as the working fluid and not rust or burn away the displacer.

[@dnomyarnostaw]

I would pay money to see it use Hydrogen, which is even better performing :-)

[@leerman22]

@@dnomyarnostaw Hydrogen worms its way into metal especially at high temperature. It would make the metal very brittle.

[@dnomyarnostaw]

@@leerman22 Like all modern Hydrogen handling equipment, you would need to use a ceramic coating on exposed surfaces.

[@leerman22]

​@@dnomyarnostaw And the ceramic coating doesn't crack from repeatedly going from high temperature to ambient?

[@dnomyarnostaw]

@@leerman22 Ceramic doesn't crack on high speed diesel engines pistons . Also, the hot air doesn't need to be from direct flame on metal .

[@manavestnation]

I used to work for a canning company and the packs were wrapped in shrink film, the heat tunnels that the packs passed through to shrink it would feel hot from the outside. As it happens they had cold water drains running underneath them. My idea to them was create a sterling motor that extracted the heat from the outside of the tunnels with the other end in the cold water. From my understanding the hotter one side is in relation to the other produces more drive. We had 3 massive units that would run 24/7. They wouldn't spend the time even considering it even though we had engineers doing nothing half the time. I am sure it was possible and would have produced a lot of energy over time. It would not have been anything like your design though. You speak of optimization but those units were at a constant 160 degrees C. If anyone can figure out a good design i would think companies would take it up as how many companies shrink wrap their packs and saving energy is becoming a big issue in industry.

[@canhobiatolyesi3650]

Congratulations my friend, great job.

[@kennethalmond8922]

Very nice video. I've been into DIY solar/powerwalls the last 3 years, and the addiction of finding / processing used 18650 cells into large batteries is a similar addiction. I'd LOVE to acquire (build I guess) a stirling engine in the 5-10hp range as a wood fired generator - but as you know, there's nothing available on this that I can find or buy in any reasonable price range. Again, really enjoyed this inspiring video - good luck on your work.

[@mikeryan3537]

You should have it drive a water pump to supply the cooling water, you could also have a small generator that you could put progressively more load onto to work out how much power it produces. Great project, its something ive thought about for a long time too but never taken the plunge!

[@nigratruo]

The true capacity of stirling engines has not even remotely been relalized, I figure we need smarter people in the next generations.

[@middleway1885]

We would need a better teaching method... everything customized... especially towards the astrology aspects as well (But not forced)...

[@dod180]

Gorgeous work

[@anandawijesinghe6298]

Leo, as a dynamometer use a permanent magnet model aero electric motor as a generator. Couple it directly or via a belt drive to one output shafts of the engine. Measure its output with a small digital wattmeter. First Calibrate the efficiency of the generator itself using an identical motor to drive it. Measure the speed using a tachometer. Use an identical second motor to drive the first motor used as the generator. The input and output power to motor can be measured with digital wattmeters. The generator can be loaded with 3 identical resistors in a star connection. Instead of digital wattmeters, ammeter and voltmeters can be used to measure input and output power. For example, the output load resistor current can be measured with an ammeter. The power output is 3x I×I x R where I is the current through each resistor. Obviously, the efficiency of the generator is equal to the output power divided by the input power. When using a second motor and a resistor load, the efficiency of each motor/generator is equal to SQRT (3 IxIXR/W) where W is the input power read by the digital wattmeter. This efficiency should be about 95-99%. Then the engine power output can be measured as equal to the ojtput wattmeter reading divided by the generator efficiency at that speed. Speed dependence of generator efficiency could be a problem, so you will have to measure it at various speeds. The motor-generator setup would facilitate that.

[@alleneakins1]

Great work. Love the design. If you get moderately favorable dyno results, you should try hooking it up to an electrical generator. I would love to see how it fairs/how much electrical power it could produce.

[@pjmr666]

Amazing stuff! Cool desogn and you are able to explain and break it down in a very good way!

[@anaglog77]

Really cool stuff mate I look forward to seeing more! :)

[@MrBhudon22]

Thanks Leo for shared. Really interesting stuff. Not to get some tin cans setup....

[@calvinh9453]

You sir just gave me a new project that thing is amazing!!!

[@GerryRR]

This looks great, I can't wait to see what else you come up with! What material are you printing the parts out of? What about using copper wool for the regenerator? Subscribed!

[@hissst69]

After you have the dyno done it would interesting to do some maths and see if the sterling does a better job of converting heat differentials to electricity than pnp/npn junctions. Micro electro mechanical old tech VS old mechanical tech :)

[@PoconoPlaces]

very nice effort and even a better presentation, Would love to work with you on building a practical one

[@MacShrike]

You have the rhombic drive! This is so cool. But I think you forgot the counterweights. Splendid job though! X M

[@edcammarata6430]

Great, i learned a lot as far as the addition thing u are so right,please make more videos

[@blueckaym]

Nice job!! To improve it further a careful choice of materials should be done, to reduce amortization and energy/efficiency losses. One hint (though probably quite advanced) is, as I'm sure you know Stirling engine is a heat engine, and as such it efficiency is MUCH higher when the cold chamber temperature is closer to 0ºK For example the theoretical max efficiency of any heat engine with cold tank at room temp, lets say 20ºC and hot temp, say at 240ºC is about 42%, while for the same temperature difference if your cold tank is at -200ºC (little colder than air condensation temp.) and the hot tank is at room temp of 20ºC you'll get 75% max.theoretical efficiency. If cold-hot tanks are at -200ºC & 240ºC you'll get over 85% max.theoretical efficiency Of course practical efficiency would always be lower, depending on the engineering of the engine. You also might want to have a look (if you haven't already) at this old video showing efficiency optimizations kzbin.info/www/bejne/faKskqN6gNmpsMU I see you're using heat-regenerator as the displacer-piston - don't know which works better, but your approach is definitely simpler (and have much less surface for energy losses to external environment - only the cylinder walls). The rhombic drive is also very nice touch, but you can see the counter-weight optimization they did to make it as close to perfectly balanced as possible, and thus allow it the operate at much higher RPMs. And of course if you want to increase the amount of work done (if you're planning to put it to some real use) you would want to increase the pressure of the gas inside, and also probably to replace the air with some gas with better heat conductivity like hydrogen or the safer option helium (though it's rather deficit at the moment :/) Good luck with the project! And keep us updated - it's very interesting indeed! :)

[@inertproductionsalternate9114]

I would make a spiral inside the water jacket with the inlet and outlet at opposite ends. That way the water is forced all the way around. You can also pressurize the jacket with air to 5 psi and then use soapy water to find the leaks. Also integza has a few videos on measuring dynamic torque and rpm which will allow you to determine the available power of the engine.

[@smsmuller]

First time viewer of this channel, great content! Would love to see what you come up with after maybe watching Cody's Lab findings from a video a while back and see what you come up with, it may or may not work with your philosophy or relatively mundane parts.

[@jowiemonster]

I love the design. Only thing i would add is a bike valve. It makes it easy to increase the pressure in the chamber increasing the power.

[@ArcanusLibero]

A great project. Thanks for sharing.

[@barumman]

A great project, well done, I'm afraid you are now addicted. :)

[@christianseiser5547]

Print the upper parts in ASA, this is able to work in hot ambient (Print-Temperature ca. 240-260°c) and you can close the cappilars by flushing it once with e.g. isopropanol, an alcohole. I printed a little Arielle for my daughters aqarium of it. I placed the figure some minutes hanging in a closed glas with a shape of alcohol on its bottom. The cold steam is enough to do the job. While drying, the surface gets fluid and melts together - so the capillars disapper. If you let it too long in the glas, the chemical melting gets deeper in the figure, so it gets weak and may loos its form. so, be careful. ... and of cause .. dont breath in too much of it 🤪

[@sierraecho884]

This really is awesome, I had the exact same idea xD If interested you (or your viewers) can improve the efficiency further by - using helium instead of air inside the engine. - adding a "regenerator", in fact this part makes a hot air engine into t true Stirling engine, this is the main contribution by Mr. Stirling which increased efficiency significantly - replacing the rhombic drive with a simpler "half rhombic drive" or drop it entierly and make a free displacer Rimgbom Stirling engine - replace all the linkages by a diaphram and use the liniar actuation to generate electricity

[@rx8tom]

This is super cool! I wonder if cooling fins inside the chamber could help with efficiency, giving more surface area to the air. Excited to see more!

[@philmanke7642]

It Is important to efficiency to keep the working gas compression and expansion chamber as free of un-heated or un-cooled gas as possible, so introducing fins rapidly becomes a power loosing attribute if it displaces more gas than the efficiency it may lend.!.!.!. Robert Stirling origional patent also concerned a "regenerator", which involved using an absorptive metal wool or fine wire in the channel or tubes connecting the hot and cool chambers of the engine, which would absorb and re-impart heat energy to the occilating working gas.!.!.!.

[@ViniciusMiguel1988]

Great content! Keep going!

[@marcosvaleriociencia1021]

Olá amigo!! Very nice !! Você é meticuloso e este rombic está incrivel! Você mostrou todas as partes do stirling, belo trabalho!!! Grande abraço, Rio de Janeiro, Brasil!!!!!!Eu adoro os stirlings!!!😃😃😃

[@smferreiro2610]

Great job! I'll try it myself!

[@MrFreddiew1]

Love it..Great job, technically excellent. Thanks for sharing.

[@mhuppertz]

I would love to have the STEP files of your design. It is innovative and unique!

[@lincolnweller9123]

It is great content and thank you. I also appreciate your style and strait up delivery . And it works all well . What will it power ,any #s ?

[@ronarmstrong835]

Love your engine. A couple of thoughts. Scotch yokes are simpler and take up less space. I am astounded by the fact that this engine isn't in a production car. There's a plastic called Torlon that could be used to make these ridiculously light and withstands very high heat.

[@TimesWatcher]

OHMYGOSH!!! YOU CRACK DEALER YOU!!! Sure... it's all fun and games until... now I have to BUILD ONE!!! This video is DELICIOUS!! Thank you! I wonder (in an open source sort of way, posting my thoughts for all to share) if the trick to a good stirling engine isn't a really really long displacer? If you keep the hot area further away from the cold area... wouldn't the temperature change be easier to increase, and thereby make it easier to harness the hidden nectar of power in these things? I LOVE your addiction to symmetry by the way! Fantastic design... and you REALLY tapped into the essense of the Stirling weakness in the inventor's mind! LIKED AND SUBSCRIBED!!! Can't wait for your next video!