Concrete: how many propellers are best for using in construction of a boat?

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Question:

how many propellers are best for using in construction of a boat?

Answer by john
a 4 finned propeller would be most common. but three would work well too for smaller boat

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6 Responses to Concrete: how many propellers are best for using in construction of a boat?

  1. William W says:

    Small boat – 1.
    Large boat – 2.
    Ship – 2 – 5.

  2. ricsudukai says:

    That depends on the designer mostly. Single screws are popular, but so are twin wheels. Shipping can have 3, 4, or more. Drug runners put as many as can fit across the back – and the biggest available too!

    I find twin engines give me less draft as the props are up each side rather than below the deepest part of the keel.

    The designer should have considered all issues before the plans are finalised – a bad design will be a dog no matter what engine configuration is used, and a builder can definitely have good and bad days with the same design!!

    Having two or more main engines is handy if an engine fails, particularly on a tricky dark night in a bad place. There is a torque multiplication effect that gives additional performance and load capacity but the running costs are higher and servicing costs are doubled – fuel loads and general weight is increased which takes away performance. Some steering possibilities exist with multiple props that don’t exist for single units – this is irrelevant with thrusters however so I don’t find any compelling argument overall for any one set-up.

    They all have their good and bad points. Depend much on the design as said and the type of vessel.

    Good luck.

  3. Yamamoto says:

    go with oars like a roman.

  4. Richard C says:

    Depending on the size of the boat, one propeller is most efficient. Some yachts are now using some type “pod drive” where the propeller faces forward on a steerable pod. this increases efficiency and maneuverability. Even large cruise ships are going to this system, with multiple pods.

  5. Veronica Alicia says:

    For a small boat, I’d go for one and have a bow thruster, too, for ease of manoeuvring.
    The pods mentioned by the previous contributor are amazing – aero-engines in a pod which can swivel in all directions. They enable a large cruise liner to go just about as fast in reverse as for’ard!

  6. fishtrucker says:

    How big of a boat? Where will it operate ? How many engines? What do you expect it to do? If the vessel is to be used on long cruises in dangerous waters , it’s good to have 2 engines with 2 propellers.If one engine quits or it’s prop is fouled or damaged , you still have one operating to get you out of trouble. If you plan to operate in shallow waters , twin screws are a better choice.Twin screws don’t give as deep a draft as a single screw .,less chance of striking bottom and damaging a blade.

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