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4 cyl. steam engine

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paul gough:
In a sense that is correct, but as we only have a single circle it equates to positions of 45 and 225. This is not a new idea. Mr Maunsell of the Southern railway in the UK designed a 4 cyl. locomotive with this arrangement of cranks, albeit with centre cyls. driving an axle forward of the outer ones. Regards, Paul Gough

paul gough:
P.S. If you draw a single circle with the positions of the pistons/cranks at the eight positions you can see the relationship.

crueby:
Was there supposed to be a picture in your  last post? Just a big blank spot?


And your list of numbers has 270 twice?  I still dont get it. Why show pistons in both locations, the cranks are not evenly spaced out...

paul gough:
I have edited the previous post and will try to get across the crank dispositions as best I can. I don't have a camera anymore to take a photo of a drawing. Draw a circle, say around the outside of a circular protractor and mark off 0 degrees and then 180 for the position of the first piston/crank at the each  end of the stroke,or T.D.C. Then the same for 135 degrees and its opposition at 315 degrees, then add another 135 degrees and so on for a total of four times. You will end up with eight positions 45 degrees apart. You should end up with a circle showing 0 & 180, 135 & 315 270 & 450 (or in reality corresponding to 90), 405 (corresponding to 45) & 585 (corresponding to 315). In other words a circle with every 45 degrees marked off from a zero position.

 Another way is to mark in four points that progress at 135 degrees intervals from zero. Then place another set of points diametrically opposed to these, ie. 180 degrees from them. The same outcome will be achieved. Regards Paul Gough.

See Photo.

paul gough:
I added a sketch of the crank positions to the last post, hope this makes things clearer. Regards, Paul Gough.

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