Can you imagine the brain power the inventor had to conjure up such such a wonderful valve gear in the first place .. no C A D no computers just pure genius ..
In the precise timing mechanisms of a steam locomotive I see the ingenuity of early clockmakers. Massive steel components operating in delicate synchrony, like a fine Swiss watch.
Credit to Brad Litwin, at 0.25 you can see that the radius rod is lifted above the expansion link pivot point, hence the reason it is running backwards.
That does not mean it is in reverse. The valve gear is actually in forward. The eccentric crank is leading and lead and lap lever is for inside admission. This means that it is set up for indirect motion Walschaert where forward is in the top part of the link. The wheel motion is determined by the motor and not the valve gear in this model, but the wheel motion is wrong. If the valve gear was to be set in reverse then A) the link block will be in the bottom part of the link or B) the eccentric would be set for following
It's set to the reverse position. The Johnson Bar/reverser is pulled back and the radius bar is above the expansion link pivot. That's why it's going backwards.
No, the reverse bar is set to move the valve forwards. The eccentric crank is set for indirect motion so forwards is in the top part of the link. The eccentric needs to be moved so it is following and then everything will work properly
The lead and lap lever is the vertical lever between the piston and valve. When the radius rod connects to the top of the lead and lap lever (aka combination lever) and the valve connects below the radius rod, the movement from the piston will directly move the valve in the same direction as the piston (and will be the only movement when the valve gear is in center). With this set up, the valve gear is set up for inside admission piston valve. When the crank pin is at the 6 o'clock position and the eccentric crank is leaning forwards, the eccentric crank is following the main crank pin (when looking at it is as the wheels running forward). This would be direct motion for inside admission valves where forward is in the bottom part of the link and reverse is in the top - this is the typical way it is set up. However in this model, when the crank pin is at the 6 o'clock position, the eccentric crank is leaning backwards; the eccentric crank is leading the main crank pin (when looking at it as the wheels are running forward). This would be indirect motion for inside admission valves where forward is in the top part of the link (motion of the valve is opposite of the motion of the eccentric crank) and reverse is in the lower part of the link. The valve gear is set in forwards for indirect motion Walschaert with inside admission valves - yet the wheels are wrongly rotating in reverse
I could watch the valve gear on a steamer move for hours at a time, just watching all the pieces move. I would love it if someone looped low angle footage of a real steamer's drivers as it traveled down the tracks.
I have a metal version of the Walschaerts gear motion. This wooden one is very nice! I don't remember seeing that at the Charles River Museum. Though I do remember the live steam locomotive models!
The way it is set up, the wheels should be rotating forwards as it is set up as inside admission, indirect motion Walschaert gear. Or reset the eccentric so it is following (it is set up for leading) and then the engine can run in reverse. The way that it is, the valve motion is for forwards yet the wheels are rotating backwards
@@FS2K4Pilot No, it is set up as indirect motion Walschaert (eccentric crank is leading, lead and lap lever is for inside admission) so forward is in the top part of the link. The wheel rotation is wrong for where the valve gear is set. Change the eccentric crank so it is following or put the link block in the bottom part of the link and now it is in reverse
A cool looking model but without narration or subtitles most people have no idea what it's doing, this is the "transmission" of a steam engine. It's the throttle, and neutral and reverse, could use closer examination and explanation.
Glad I wasn’t the only one to notice it’s running backwards. It’s sad to see such grate craftsmanship go to pot. The motor running this is going the wrong way. This would be pumping steam to correct such movement. The eccentric crank should lean slightly back at bottom dead center as well. In this manner tho it does almost correct the problem. But does not as the timing of the valves are way off.
The gear is in reverse, the bar is pulled back, the radius rod is in the top sector of the expansion link, the wheels are in reverse. You can't see enough cylinder detail to see if it's inside admission. Odd to see it running backwards but the model looks correct.
@@laurenssmith9534 Yes, Nickolas is correct. The demo is running backwards when it should be running forwards. The lead and lap lever is the vertical lever between the piston and valve. When the radius rod connects to the top of the lead and lap lever (aka combination lever) and the valve connects below the radius rod, the movement from the piston will directly move the valve in the same direction as the piston (and will be the only movement when the valve gear is in center). With this set up, the valve gear is set up for inside admission piston valve. When the crank pin is at the 6 o'clock position and the eccentric crank is leaning forwards, the eccentric crank is following the main crank pin (when looking at it is as the wheels running forward). This would be direct motion for inside admission valves where forward is in the bottom part of the link and reverse is in the top - this is the typical way it is set up. However in this model, when the crank pin is at the 6 o'clock position, the eccentric crank is leaning backwards; the eccentric crank is leading the main crank pin (when looking at it as the wheels are running forward). This would be indirect motion for inside admission valves where forward is in the top part of the link (motion of the valve is opposite of the motion of the eccentric crank) and reverse is in the lower part of the link. The valve gear is set in forwards for indirect motion Walschaert with inside admission valves - yet the wheels are wrongly rotating in reverse
Stephenson is easy to identify by the 2 eccentrics and rods rocking a curved link. You're right that this is a Walschaerts, which always has the single link to the crank motion, usually with a crank arm rather than an eccentric.
The vast majority of locomotives, anywhere in the world, in the 20th century, used Walschaerts, particularly on outside valve gear. (I think many US railroads used Baker, which was an adaptation of Walschaerts). Stephenson uses two eccentrics, which were easy to arrange on an axle for inside gear, but looks quite odd for the rare cases of outside Stephenson.
It is running backwards due to a mistake. The valve gear is set for forwards due to it being an indirect motion Walschaert with inside admission valves
What's not great is that it should be running on compressed air with a lever for people to play with to move it forward & backward. having it powered by a motor is booring.
@@1earedwolf With good reason - turning backwards is wrong for how this valve gear is set up The lead and lap lever is the vertical lever between the piston and valve. When the radius rod connects to the top of the lead and lap lever (aka combination lever) and the valve connects below the radius rod, the movement from the piston will directly move the valve in the same direction as the piston (and will be the only movement when the valve gear is in center). With this set up, the valve gear is set up for inside admission piston valve. When the crank pin is at the 6 o'clock position and the eccentric crank is leaning forwards, the eccentric crank is following the main crank pin (when looking at it is as the wheels running forward). This would be direct motion for inside admission valves where forward is in the bottom part of the link and reverse is in the top - this is the typical way it is set up. However in this model, when the crank pin is at the 6 o'clock position, the eccentric crank is leaning backwards; the eccentric crank is leading the main crank pin (when looking at it as the wheels are running forward). This would be indirect motion for inside admission valves where forward is in the top part of the link (motion of the valve is opposite of the motion of the eccentric crank) and reverse is in the lower part of the link. The valve gear is set in forwards for indirect motion Walschaert with inside admission valves - yet the wheels are wrongly rotating in reverse
A beautifully made model, but the clip desperately needs some commentary to explain to the uninitiated not just what is going on but how this differs to other valve gears.
@@Sebdamememan Because backwards is wrong....valve gear is very obviously set to forwards as it is indirect motion Walschaert with inside admission valves The lead and lap lever is the vertical lever between the piston and valve. When the radius rod connects to the top of the lead and lap lever (aka combination lever) and the valve connects below the radius rod, the movement from the piston will directly move the valve in the same direction as the piston (and will be the only movement when the valve gear is in center). With this set up, the valve gear is set up for inside admission piston valve. When the crank pin is at the 6 o'clock position and the eccentric crank is leaning forwards, the eccentric crank is following the main crank pin (when looking at it is as the wheels running forward). This would be direct motion for inside admission valves where forward is in the bottom part of the link and reverse is in the top - this is the typical way it is set up. However in this model, when the crank pin is at the 6 o'clock position, the eccentric crank is leaning backwards; the eccentric crank is leading the main crank pin (when looking at it as the wheels are running forward). This would be indirect motion for inside admission valves where forward is in the top part of the link (motion of the valve is opposite of the motion of the eccentric crank) and reverse is in the lower part of the link. The valve gear is set in forwards for indirect motion Walschaert with inside admission valves - yet the wheels are wrongly rotating in reverse
What could have been a great 5 minute video is a poor 1 minute video. We're watching because we want to see the levers in motion and learn how it works. What we got was too brief and in and out and not paying attention to the engineering of all the components.
Thanks for your comment, Mark. I shot that video almost 9 years ago at the Charles River Museum of Industry & Innovation in Waltham, MA. I apologize for the video's deficiencies, but I admit I had a poor understanding of the machine. The video has collected 75 comments so far, positive and negative. Many have commented it's running backwards. I had no control over that.
The puffing sound is on the rods right like the tender engines and tram engines tender engine there puff sound I loud have a lot of rods and tram engines are much slower because it have a smaller boiler and they have have side plates some other dont they have side plates because on the cow cachers oh I for got the puff sound is very quiet un like e2 tank engine or for short thomas the tank engine have rods on the bottom so that's why there not the strongest there piston it's at the buttom some times there puffing sound is fast some time are old I'm just teaching ya old chap now chop chop good bye my phone got broken
+Matthew Palermo Thank you for the correction, but the information card posted at the Charles River Museum in Waltham, MA identified it as a Walschaerts, and that's all I had to go on.
![โรงเรียนห้ามรัก โดนจับได้ตาย...!! [เอิร์นไดเม่]](http://i.ytimg.com/vi/4u02Sbr556Q/mqdefault.jpg)
Can you imagine the brain power the inventor had to conjure up such such a wonderful valve gear in the first place .. no C A D no computers just pure genius ..
In the precise timing mechanisms of a steam locomotive I see the ingenuity of early clockmakers. Massive steel components operating in delicate synchrony, like a fine Swiss watch.
@@RickyJr46 no, we just made this, we just knew kinda what to machine what to make,
Gotta love mechanical logic
Wasn't exactly invented ex nihilo, took ages of progressive development to get to that level of refinement.
@@RickyJr46 .b
This is a real man's mechanism, and beautifully crafted in wood. A proper tribute to the genius of steam power.
What an impressive gear model! Thanks for the video.
Credit to Brad Litwin, at 0.25 you can see that the radius rod is lifted above the expansion link pivot point, hence the reason it is running backwards.
Beat me to it. This is the reason I try to read through the comments before I post.
That does not mean it is in reverse. The valve gear is actually in forward. The eccentric crank is leading and lead and lap lever is for inside admission. This means that it is set up for indirect motion Walschaert where forward is in the top part of the link.
The wheel motion is determined by the motor and not the valve gear in this model, but the wheel motion is wrong.
If the valve gear was to be set in reverse then A) the link block will be in the bottom part of the link or B) the eccentric would be set for following
It's set to the reverse position. The Johnson Bar/reverser is pulled back and the radius bar is above the expansion link pivot. That's why it's going backwards.
No, the reverse bar is set to move the valve forwards. The eccentric crank is set for indirect motion so forwards is in the top part of the link. The eccentric needs to be moved so it is following and then everything will work properly
The lead and lap lever is the vertical lever between the piston and valve. When the radius rod connects to the top of the lead and lap lever (aka combination lever) and the valve connects below the radius rod, the movement from the piston will directly move the valve in the same direction as the piston (and will be the only movement when the valve gear is in center). With this set up, the valve gear is set up for inside admission piston valve.
When the crank pin is at the 6 o'clock position and the eccentric crank is leaning forwards, the eccentric crank is following the main crank pin (when looking at it is as the wheels running forward). This would be direct motion for inside admission valves where forward is in the bottom part of the link and reverse is in the top - this is the typical way it is set up.
However in this model, when the crank pin is at the 6 o'clock position, the eccentric crank is leaning backwards; the eccentric crank is leading the main crank pin (when looking at it as the wheels are running forward). This would be indirect motion for inside admission valves where forward is in the top part of the link (motion of the valve is opposite of the motion of the eccentric crank) and reverse is in the lower part of the link.
The valve gear is set in forwards for indirect motion Walschaert with inside admission valves - yet the wheels are wrongly rotating in reverse
man! would've loved to see it going forward.
I could watch this all day...
Beautiful can see how timing can be set more "before" with sliding pivot.
Some people are unkind, i'm predicting that they probably haven't posted their own vid, personally i thought it was fine! Thanks
Thanks for that rare compliment, Ian.
@@bobd.4902 ²22222²2²22222²²2222222222222222222222222222222222222222222222222222222222222222222222222222222222²22
@@АйнурМандибаева-б3ю ummmm ok
Очень хорошо выдержана колористика, передаёт дух времени. Спасибо!
a ''primitive'' steam kocomotive is a more ingenious thing than, say, a mag-lev thing
..very good for educational working model at low cost ,
Beautiful!! I have been thinking of doing one in wood but this blows away anything I had in mind. Nice work!
I could watch the valve gear on a steamer move for hours at a time, just watching all the pieces move. I would love it if someone looped low angle footage of a real steamer's drivers as it traveled down the tracks.
Soo Line same
th-cam.com/video/T2jc92v7vNU/w-d-xo.html
True
Excelente trabajo felicitaciones para los que los que la realizaron
Took a genius to design this.
This isn't Walschaerts... it's Woodschaerts. 🤣🤣🤣
Stunningly beautiful piece of work here.
Its so amazing but whats not so amazing is that its running in reverse
Lol yea ikr
They run fine in reverse and does exactly the same job as going forwards.
@@malcolmabram2957 - Exactly! Same motions forward/reverse. Watching the Walschaerts valve gear is like watching poetry in motion!
I have a metal version of the Walschaerts gear motion. This wooden one is very nice! I don't remember seeing that at the Charles River Museum. Though I do remember the live steam locomotive models!
In deed
Satisfaction level 10!!!
Looks like a great weekend trip for our family! Thank you.
Great way to get to your vegetable garden
Nice model of drive wheels and piston. Thanks.
The way it is set up, the wheels should be rotating forwards as it is set up as inside admission, indirect motion Walschaert gear.
Or reset the eccentric so it is following (it is set up for leading) and then the engine can run in reverse.
The way that it is, the valve motion is for forwards yet the wheels are rotating backwards
Unless it's outside admission.
And it's actually a reverse Walschaerts.
What is the difference between a leading and trailing eccentric crank and why is there a difference? Please forgive my ignorance.
@@FS2K4Pilot This is impossible to be outside admission. The lead and lap lever is set up for inside admission.
@@FS2K4Pilot No, it is set up as indirect motion Walschaert (eccentric crank is leading, lead and lap lever is for inside admission) so forward is in the top part of the link. The wheel rotation is wrong for where the valve gear is set. Change the eccentric crank so it is following or put the link block in the bottom part of the link and now it is in reverse
A cool looking model but without narration or subtitles most people have no idea what it's doing, this is the "transmission" of a steam engine. It's the throttle, and neutral and reverse, could use closer examination and explanation.
Que legal !! Muito bem feito !!! Poderia estar saindo um vaporzinho de algum lugar, né ...
É Muito legal, vamo respeitar. Um show de funcionamento
By the looks of it, this is the driving wheels and pistons of a NYC J1. NYC's Hudson-type locomotives are some of my favorites.
A good close up
could you zoom in a little more? I would like to see the grain of the wood a lot better..
A great pity you didn't stand still whilst filming.
now THAT is some sweet wood work! ,how long did the students work on this project?
i think is 2 day or 2 month
Para poner a volar la imaginación.
Glad I wasn’t the only one to notice it’s running backwards. It’s sad to see such grate craftsmanship go to pot. The motor running this is going the wrong way. This would be pumping steam to correct such movement. The eccentric crank should lean slightly back at bottom dead center as well. In this manner tho it does almost correct the problem. But does not as the timing of the valves are way off.
No it isn’t
The gear is in reverse, the bar is pulled back, the radius rod is in the top sector of the expansion link, the wheels are in reverse. You can't see enough cylinder detail to see if it's inside admission. Odd to see it running backwards but the model looks correct.
@@laurenssmith9534 Yes, Nickolas is correct. The demo is running backwards when it should be running forwards.
The lead and lap lever is the vertical lever between the piston and valve. When the radius rod connects to the top of the lead and lap lever (aka combination lever) and the valve connects below the radius rod, the movement from the piston will directly move the valve in the same direction as the piston (and will be the only movement when the valve gear is in center). With this set up, the valve gear is set up for inside admission piston valve.
When the crank pin is at the 6 o'clock position and the eccentric crank is leaning forwards, the eccentric crank is following the main crank pin (when looking at it is as the wheels running forward). This would be direct motion for inside admission valves where forward is in the bottom part of the link and reverse is in the top - this is the typical way it is set up.
However in this model, when the crank pin is at the 6 o'clock position, the eccentric crank is leaning backwards; the eccentric crank is leading the main crank pin (when looking at it as the wheels are running forward). This would be indirect motion for inside admission valves where forward is in the top part of the link (motion of the valve is opposite of the motion of the eccentric crank) and reverse is in the lower part of the link.
The valve gear is set in forwards for indirect motion Walschaert with inside admission valves - yet the wheels are wrongly rotating in reverse
Awesome model!
C'est sur ce systèmes que des millions de kilomètres ont étés parcourus par nos chères locomotives a vapeur
Elles sont pour toujours dans nos mémoires
あらためて見ると、知恵のかたまりですね。
Indirect Walschaerts i believe. I always get confused with Stephenson. I believe the army, soo line, and other railroads used this valve gear brand.
Stephenson is easy to identify by the 2 eccentrics and rods rocking a curved link. You're right that this is a Walschaerts, which always has the single link to the crank motion, usually with a crank arm rather than an eccentric.
The vast majority of locomotives, anywhere in the world, in the 20th century, used Walschaerts, particularly on outside valve gear. (I think many US railroads used Baker, which was an adaptation of Walschaerts). Stephenson uses two eccentrics, which were easy to arrange on an axle for inside gear, but looks quite odd for the rare cases of outside Stephenson.
It is set up as indirect motion, but the valve gear is set in forwards while the wheels are wrongly turning backwards
Would’ve been much more interesting if it was in forward motion at full steam.
Its amazing
JPL tvChannel j
Video taken at the Charles River Museum in Waltham, Mass. I added a link to more museum photos in the description field.
W@hat a beautifui model. Of course, any comment suggesting that you're "an idiot" can be dismissed out of hand.
cool
Filmed on a steam powered moving picture machine.
Top Job!
The locomotive moves away from the piston that does not move till the end of its stroke then catches up to start again
Wow es de las locomotora de vapor y es un piston original
Muito esclarecedor!
Its amazing but why its running in backwards
It is running backwards due to a mistake. The valve gear is set for forwards due to it being an indirect motion Walschaert with inside admission valves
Train is backing up.
YEESSSSS JACK POTTT
Was any of it in focus?
excellent realization, congratulations to the author
MUITO INTERESSANTE....
A question I’ve always wondered are the pistons double acting with steam admitted in both ends.🇦🇺
Yes. The valve gear alternately opens and closes steam ports in front
and behind the piston.
0:39 Rod number 2 is moving the steam inlet tube
What's not great is that it should be running on compressed air with a lever for people to play with to move it forward & backward. having it powered by a motor is booring.
It’s going backwards
No explanation of how it works, huh
If that's made out of what I think it is then someone put some serious time into carving all that wood.
That was the first thing I noticed. What a great job
Likely carved by lathes and mills, not by hand.
keep it in one place lets figure out what is going on instead of zooming and out of focus bs.
Such a nice model deserves a better video than this.
Looks Like Henry’s Wheels!
Nah it looks like James mix with Gordon lol
something better than nothing
????.... its going backwards ?
FOCUS !!!!!!
nobody is questioning the wheels are going backward
Many people are. For no reason.
Die Dampflokomotive Teil 5 - Bedienung - German • Great Railways
th-cam.com/video/LrIgtOHUPDU/w-d-xo.html > > > 13(min):52(sec)
@@1earedwolf With good reason - turning backwards is wrong for how this valve gear is set up
The lead and lap lever is the vertical lever between the piston and valve. When the radius rod connects to the top of the lead and lap lever (aka combination lever) and the valve connects below the radius rod, the movement from the piston will directly move the valve in the same direction as the piston (and will be the only movement when the valve gear is in center). With this set up, the valve gear is set up for inside admission piston valve.
When the crank pin is at the 6 o'clock position and the eccentric crank is leaning forwards, the eccentric crank is following the main crank pin (when looking at it is as the wheels running forward). This would be direct motion for inside admission valves where forward is in the bottom part of the link and reverse is in the top - this is the typical way it is set up.
However in this model, when the crank pin is at the 6 o'clock position, the eccentric crank is leaning backwards; the eccentric crank is leading the main crank pin (when looking at it as the wheels are running forward). This would be indirect motion for inside admission valves where forward is in the top part of the link (motion of the valve is opposite of the motion of the eccentric crank) and reverse is in the lower part of the link.
The valve gear is set in forwards for indirect motion Walschaert with inside admission valves - yet the wheels are wrongly rotating in reverse
A beautifully made model, but the clip desperately needs some commentary to explain to the uninitiated not just what is going on but how this differs to other valve gears.
This has got to be one of the most toxic comment sections I've ever seen
I have a magnetic engine that uses the locomotive drive configuration. Patent comming😄
Hey ! Not enough showing on the valve !
Wheels showing , turning backwards. No like no sub.
omg finally somebody noticed
@@robloxracingunited whats wrong with it going backwards? The reverser rod is over the point so its ok
@@Sebdamememan imagine taking 1 year to respond to a message
@@Sebdamememan Because backwards is wrong....valve gear is very obviously set to forwards as it is indirect motion Walschaert with inside admission valves
The lead and lap lever is the vertical lever between the piston and valve. When the radius rod connects to the top of the lead and lap lever (aka combination lever) and the valve connects below the radius rod, the movement from the piston will directly move the valve in the same direction as the piston (and will be the only movement when the valve gear is in center). With this set up, the valve gear is set up for inside admission piston valve.
When the crank pin is at the 6 o'clock position and the eccentric crank is leaning forwards, the eccentric crank is following the main crank pin (when looking at it is as the wheels running forward). This would be direct motion for inside admission valves where forward is in the bottom part of the link and reverse is in the top - this is the typical way it is set up.
However in this model, when the crank pin is at the 6 o'clock position, the eccentric crank is leaning backwards; the eccentric crank is leading the main crank pin (when looking at it as the wheels are running forward). This would be indirect motion for inside admission valves where forward is in the top part of the link (motion of the valve is opposite of the motion of the eccentric crank) and reverse is in the lower part of the link.
The valve gear is set in forwards for indirect motion Walschaert with inside admission valves - yet the wheels are wrongly rotating in reverse
Shame you can’t see the critical valve movements. In that respect, the vid is unfortunately useless. Fine model though.
You don’t show the valve timing or valve movement which is whole point of the model. Now do you understand what I mean?
Elegantly primitive
💞💜💚💛💞
I feel dizzy d/t poor camera shooting.
anyone able to recreate such a model or one similar send me a private message lets talk!
Pero no se muestra el sistema de poleas a vapor… la parte más importante del proceso no lo mostraron..
Yeah, video quality needs improvement.
What could have been a great 5 minute video is a poor 1 minute video. We're watching because we want to see the levers in motion and learn how it works. What we got was too brief and in and out and not paying attention to the engineering of all the components.
Thanks for your comment, Mark. I shot that video almost 9 years ago at the Charles River Museum of Industry & Innovation in Waltham, MA. I apologize for the video's deficiencies, but I admit I had a poor understanding of the machine. The video has collected 75 comments so far, positive and negative. Many have commented it's running backwards. I had no control over that.
Legal
? naw I meant overall carving out start to finish
shouldve used steam ngl
Show!!!!!
The puffing sound is on the rods right like the tender engines and tram engines tender engine there puff sound I loud have a lot of rods and tram engines are much slower because it have a smaller boiler and they have have side plates some other dont they have side plates because on the cow cachers oh I for got the puff sound is very quiet un like e2 tank engine or for short thomas the tank engine have rods on the bottom so that's why there not the strongest there piston it's at the buttom some times there puffing sound is fast some time are old I'm just teaching ya old chap now chop chop good bye my phone got broken
Good、mechanism！
Very nicw
El Tren h a vapor donde lleva el motor, nunca muestra .
Tecnologia do vapor
It's running back wards }:(
What you mean
This is the Baker Valve Gear, not Walchearts
+Matthew Palermo Thank you for the correction, but the information card posted at the Charles River Museum in Waltham, MA identified it as a Walschaerts, and that's all I had to go on.
Yeah, they're very similar and easily confused so I can see how it wasn't labeled properly
Thedeoradude Nevermind then. My bad, I wasnt looking at the expansion link, I was only lookoing at the crosshead for whatever reason
+TheLegendaryGamers//Legendary744, this is not Baker, this is Walschaert valve gear.
@@bobd.4902 Matthew has no idea what Baker gear looks like, the museum is correct.
Паровые колёса паровозы колёса паровозы
los planos podrian enviarme por favor
I don't have plans. Contact Charles River Museum of Industry & Innovation, Waltham, Massachusetts.
@ 55:00
100:10
Gg
Pitiful
L
Was this supposed to be educational?? Very weak!
170th comment pin pls
Amateur video...
Для моего велосипеда нужен такой!