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  1. Keith Martineau

    From a strictly mechanical point of

    Thanks for all the help guys! I do appreciate it! Also I have researched power for ocean going ships. The RPM is, in fact, mostly governed by the power plant (often a VERY slow diesel). The prop design reflects this. But some are turbines and some diesels are run at slightly higher RPM (there...
  2. Keith Martineau

    From a strictly mechanical point of

    I don't know the exact length of the shafts, but I would estimate a minimum of 30 yards; probably a lot longer. Imagine 18,400 tons of submarine coming to a VERY sudden stop as the prop is suddenly and dramatically reversed using full power. Anyway, thanks again everyone!
  3. Keith Martineau

    From a strictly mechanical point of

    Thanks for all the great replies guys! Those are the things I was looking for. Short and stiff seems better for my application, I think, but good to know about long shafts storing more energy, sudden loading, and all the other ideas. This helps tremendously! I am planning a LOT of extra strength...
  4. Keith Martineau

    From a strictly mechanical point of

    Thanks to you also IRstuff. I will check that out too.
  5. Keith Martineau

    From a strictly mechanical point of

    Great response Tugboateng! BTW I was a missile tech on Trident subs. 18" diameter sand-filled hollow shaft EXTREMELY long (think like part of a football field). Under certain conditions the shaft twisted more than 18 times from end to end without damage. I will try to research carbon fiber...
  6. Keith Martineau

    From a strictly mechanical point of

    From a strictly mechanical point of view (never mind the aesthetics or practicality for now)which is better to transit power, a short shaft or a long one, assuming all other factors are the same? What I'm wondering mostly is concerning strength (resisting breakage or distortion of the shaft)...
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