Re: A distant cousin to RGS 20 running a few hours ago in Brazil

Thor Windbergs Wrote:
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> Baldwin Builders No.58884 a 1925 3-Cylinder meter
> gauge Pacific 4-6-2 runs often on the tourist
> steam railroad ABPF in Campinas Brazil. It is
> alittle out of square and sounds more like 2 1/2
> cylinders when starting...
>


> =channel_page

Thor,

Unlike on a shay where all three cylinders are in a line, that engine's center cylinder is cocked at an angle so when it's "square" it won't sound like it.

The crank pins on the wheels are 120 degrees apart, as opposed to 90 as is usual. The center crank is offset from an nominal 120 degrees by the same amount as the angle of the center cylinder.

So the center cylinder exhaust event will be closer in timing to one of the outside cylinders than the other making for the uneven exhaust in the video.


And thanks for posting the links to those videos. Cool stuff.


Cheers,

Curtis F.