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| Radial 3-cylinder steam project |
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| PekkaNF:
Very analythical approach. I like You probably have stubled on this (or related) documents: http://www.enginehistory.org/NoShortDays/Vibration.pdf I have this faint memory about W or semiradial engine, but as far I can remember there was no magick on cylinder angles. Like the master/slave conrod, I think someone said me that it is nowhere perfect, but good enough to get job done. My daughter insists on this one: :coffee: :wave: Pekka |
| Kjetil:
Hi Pekka, and thanks for your response, it was some quite interesting reading. --- Quote from: PekkaNF on May 08, 2012, 01:58:56 PM ---Like the master/slave conrod, I think someone said me that it is nowhere perfect, but good enough to get job done. --- End quote --- The paper had that very same point of view. Seems like the only practical approach when designing with many cylinders, no doubt, but I end up asking myself whether it can possibly be an optimal solution to my simple problem. :scratch: I would think offseting cylinders and using plain simple crank arms would introduce a lot less fuzz to the system. The forked option hasn't quite left my mind yet either. :scratch: --- Quote from: PekkaNF on May 08, 2012, 01:58:56 PM ---My daughter insists on this one: :coffee: :wave: --- End quote --- You shouldn't give her too much coffee, it gets addictive :D take it from an addict :coffee: Just joking.. Greets from your neighbour to the northwest :wave: :wave: |
| PekkaNF:
Hello, Happy you found the reading entertaining. My gut feeling is that the fork system looks odd with three cylinders, you increase complication and risks to trade off a little weight and lenght saving over all conrods over same journal arragement. Also on your sketsch the fork is pretty wide and I don't see how it could compete with master/slave arragement in mechanical sense of benefits? Unless, if you are drawn to fork/blade system. You could stack (interleave) the fork differently to reduce the span of the single fork. I had a Harley and it had fork, no doupbt it's fine for two cylinders under certain conditions. I think only you can put prorities on order. Similar conrods on common axle will be simplest solution, but will make crankcase a little longer and will introduce some prize moment there, I believe old times that was main reason to use fork. You could make the crank just a little beeffier for torsional forces. Just my gut feelings, I have never build motor from scratch. RGDS, Pekka |
| Kjetil:
Thanks for the input Pekka, I made a different fork sketch that I plan to simulate with some forces to see if I can strengthen any weak spots, only problem is I haven't done such simulations since school, and I don't remember exactly how to. Anyways, this would be the outter rod, if that one can be done right, the other two probably can as well. No closer to any decision :bang: Kjetil |
| Kjetil:
I attached a visualization of the forked crank. It doesn't look all that bad, the worry is ofcourse the outter fork. |
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