[TC10] Pneumatic Locomotive

[gyenesvi]

4 hours ago, Technic Train Man said:

I thought my video was clear enough but it's simpler than you think.

Oh, I did not catch from the video what parts could come into contact, indeed it's simpler than I thought, thanks for the image, nice mechanism :)

[Saberwing40k]

5 hours ago, Technic Train Man said:

 So with that in mind I think the 1x11 cylinders could work.

 

Why would you use these cylinders? They're the least common and most expensive type, and the stroke to bore ratio is entirely wrong. The older standard length cylinders are a lot more correct. I don't think I have seen a steam engine, or indeed any engine, with the bore to stroke ratio of the 1x11 cylinders. Those should really be reserved for pneumatic functions, and not pneumatic engines. Also, I think you should actually use bigger wheels to take full advantage of the available stroke of the the pneumatic cylinders. Ideally, the crank would match the stroke of the cylinders exactly.

[Technic Train Man]

11 minutes ago, Saberwing40k said:

Why would you use these cylinders?

My trains are not as big as this pneumatic train so the thinner cylinders will look better and easier to work into the build.

And I think these 1x11 Cylinders will become the most common and one of the cheapest cylinders soon because there are 2x in the 42128. This set seems good to sell as parts. Looks the price has already gone down from around 20 euro to 8-9 euro.

Although it's 11 studs long it extends "only" 6 studs. I am also planning on letting someone 3D print some large Technic trains wheels.

It sounds like you know more about this than me so how big do the wheels need to be to take full advantage of the 6 studs stroke? I guess the pin hole on wheel will also be important?

In the video from the pneumatic train it looks like the cylinder does not go fully down but till a quarter down and then goes up again. It is also limited by some connectors, I guess to make the ideal stroke.

It would be nice if it can work without going to the limits of the cylinder.

I was just doing some research and the Greengecko workshop has modified cylinders for sale that can handle crazy rpms. He also sells the 1x11 with metal shaft and drilled out holes for $15. If I can build a nice pneumatic train I might buy his cylinders.

Thanks for the advice!

[Technic Train Man]

Sariel did a nice cylinder test and the 1x11 is a lot weaker. The bigger cylinders can push down on a scale to almost 3kg and the 1x11 pushes down till 700 so around 4x as weak. Of course these are unmodified cylinders. 

https://www.youtube.com/watch?v=dgGAM6VHjJ0