Walschaerts Valve Gear for a steam locomotive.

[@rand49er]

Genius. Pure genius.

[@1riverranch]

And most likely years of development.

[@donotwantahandle1111]

It's incredible that steam engines had this variable valve timing long before cars got it!

[@mitchcornacchia968]

Beautiful thanks for this demo Beautiful model and explanation

[@gerry343]

This valve gear for a steam engine is much more complicated than the gear on a four stroke internal combustion engine.

[@rogerletsom2127]

I have watched this video many times and never ceased to be fascinated by it. The explanation of Walschaerts valve gear is very clear and well presented. To me it's very simple but also ingenious. By the way, what scale is it?

[@Steven_Rowe]

I. Love stuff well made and this is. I am always mesmerized by value gear and especially the derived motion provided by the combination lever to the valve spindle. To me it is poetry in motion. A steam locomotive, the only machine designed by man that comes alive when in steam

[@rogerw2101]

Thank you . I have never understood how these work

[@madhusudanhora2339]

Please explain synchronization of piston and valve in slow motion..

[@lestermiller2717]

I’m finally getting a understanding of how these work. I’ve watched several of these videos and I never realized how complicated these drive trains could be. How did you ever figure out how to get started. I always wanted to build a Shay logging engine.

[@FarewellChorus]

Kozo Hiraoka actually wrote two books on building a model of a Shay locomotive. Both can be purchased from Village Press, the company which publishes Live Steam and Outdoor Railroading (among others). Here is the book listing: secure.villagepress.com/store/items/detail/item/1393 Also available as part of a set: secure.villagepress.com/store/items/detail/item/1673 I am not in any way affiliated with the company; just a subscribed to LS&OR who has bought several of their books.

[@TheSHIEALI2007]

Beautiful!!! Could you please do a video explaining sincronization between both pistons?

[@michaelbuckers]

You mean left and right side? They're on the same drive wheel shaft, no need to synchronize anything.

[@enriqueulloa9457]

Whats the price of a locomotive like this? I love the stream locomotives!

[@ErnieNoa3]

Nice demo!

[@vernonsaayman9741]

Walsch must have been a genius, can anyone explain ,.percentage cut off,.?

[@CipiRipi-in7df]

Very basic, it is the percentage of the piston stroke in which the piston is powered under the steam from the boiler. It can be controlled by the time on which the valve close the admission. For example, a 30% cut off mean that piston move about 30% of its stroke under the steam coming from the boiler (at boiler's pressure). After that, the valve close the admission, and the steam trapped in the cylinder expand adiabatic, under its own pressure. As the steam expand, it cool and its pressure drop, until piston reach the end of the stroke, the valve open the exhaust port, and the steam is pushed out by the return stroke of the piston. Percentage cut off help saving steam (thus saving water and coal), by delivering only the power needed to compensate for air and rail friction.

[@schutendohkji548]

Would you show me how to design the gear? Tried Don Ashton's book n software - Not clear about his variables in his equations. Dockstaeder's software - Some of the variables, especially the reverser gears are not explained and the animation rods disconnected, etc.

[@steamup1]

I did not design the valve gear. I purchased a set of castings and plans from the English company, A J Reeves. The model locomotive shown was designed by Martin Evans and as you can see, it works very good. The construction was a series in Model Engineer magazine. Martin Evans designed many locomotive from 2 1/2 to 7 1/4 gauge. He also published several books on building model steam locomotives. I have three. He does describe the designing of several valve gears. His book titled the "Manual of Model Steam Locomotive Construction" is available for free download from google docs. I am not familiar with Don Ashton or Dockstaeder's software.

[@schutendohkji548]

I see. Thank you for your response. All these people who said they've used Dockstaeder's and Ashton's software never were able to explain step by step on how to use the software, esp. on describing the walsch's variables. i guess the only way i can do is to use geometric drawing method, make a paper model cutouts of components and hook them together, move it 2C if the valve close and open the ports properly. heck!

[@schutendohkji548]

Yes, I have one of Martin's book on the valv. gr designs as well as Greenly's. They help some what on general steps. Back set amount is a bit difficult to understand and draw it on a paper sheet.

[@FarewellChorus]

Don Ashton wrote a book on how to use his software to design valve gear. It is somewhat more intelligible than his website. Even with the book, it is easy to see why so many simply copy existing designs rather than try to come up with their own.

[@jimmynswgr]

Better cut a left handed thread for your reversing stand. The driver might get confused! Nice and smooth on air, well done.

[@steamup1]

A left handed screw is not required as the lifting arm is pointed to the rear and lowers the radius rod when the reach rod is pulled to the rear. This is shown in the video.

[@CombraStudios]

Excellent job sir. Create an assembly line and produce Toy Locomotives like Baťa shoes!

[@dannywilliamson3340]

Did steam engines have their own version of "dynamic braking" seen on modern diesels? That is, could a steam engine going down hill be shifted slightly into reverse so that some amount of steam pressure was then acting to retard the speed of the train?

[@johnkuzma7066]

Not in the traditional sense but I through the engine into reverse to slow it down, it puts quite a lot of stress on the motion but nothing bad has happened yet (knock on wood).

[@mikeytrains1]

This would be better if the text wasn’t on there most of the time..

[@brycekindred372]

I wish I could build a real working steam train

[@Вольдемар-м3х]

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