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| Radial 3-cylinder steam project |
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| BillTodd:
Is there any reason why you cannot off-set the cylinders by the width of the big-end? - It would mean all the con-rods could be identical and simpler to construct. Bill |
| Kjetil:
--- Quote from: BillTodd on May 09, 2012, 10:41:43 AM ---Is there any reason why you cannot off-set the cylinders by the width of the big-end? - It would mean all the con-rods could be identical and simpler to construct. Bill --- End quote --- Nope, no reason whatsoever, it's probably the way to go. Just had to skim through the options first. Think it'll actually be easier to balance properly too, with all rods being identical. |
| PekkaNF:
--- Quote from: Kjetil on May 09, 2012, 09:22:49 AM ---I attached a visualization of the forked crank. It doesn't look all that bad, the worry is ofcourse the outter fork. --- End quote --- Is there a reason why do you must place the fork/blade such that one will span the whole distance on the crank pin? If you allow a little offset or cylinder and do all con-rods forked and anly middle one a little wider fork? Should probably C-O-C one, because I'm not sure if my explanation does any good. PekkaNF |
| Kjetil:
I understand the suggestion Pekka, and it would perhaps be a better choice than the setup I sketched, but I think my mind is settled now, on plain conrods and cylinder offset. Just makes the most sense. :beer: |
| Kjetil:
So, the crank casing got a bit deeper, so did the balancing eccentrics, but crank casing width/height could be reduced some without the crank arms colliding with the cylinder wall, and I was able to also shave some millimetres off the crank arm length due to the reduced size of the crank mechanism. From a cosmetic point of view, a cylinder exterior like this one would even hide the cylinder offset from eye. Just a thought. But the more I read on the topic of crank arms, the more confident I get that this is the best solution for me; |
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