I wasn't really paying attention in class today. How do I figure out the maximum rpm of a ship engine with a 6 foot stroke and 36in wide piston. Or can I figure this problem out with such a small amount of information. I am totally lost here
You either look it up, ask somebody who knows, or get a heck of a lot more detail about the mechanical spec of the engine so that you can work out what the weakest point is and what revs it will fail at.
You need to work out the mass of the piston and then write yourself a little spreadsheet to calculate piston speed and then work back once you have a force for an Rpm to so the stress calc, you might find the heads don't flow enough air to make it a problem!
Matt
Thank you for your replies. It looks like I won't be able to figure it out. I worked for a hour on this problem, and I was wondering what was going on.
The least additional information input to get some kind of vaguely-useful upper-limit answer would be to guess a sensible maximum piston speed. Not much exceeds 10m/s which equates to approximately 100rpm with that stroke (calcs done in head so may be wrong). This figure is better than nothing, but not by a useful amount...
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