Nimble omnidirectional speed / houseboat

Discussion in 'Boat Design' started by KyleF, Oct 30, 2019.

  1. KyleF
    Joined: Oct 2019
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    Location: Usa

    KyleF New Member

    Is it possible to have an omnidirectional speedboat with multiple motors?

    I want to be able to go 50mph in any direction in 2 seconds.

    So the front has motors, the back, the diaganols. If I'm going forward at 50mph I want to be able to "reverse thrust" and be going 50mph in reverse within two seconds. Same for diaganols.

    Super light, super nimble. Preferably all electric solar.

    Inspired by:
    jet capsule updates U.F.O houseboat for open water https://www.designboom.com/design/jet-capsule-u-f-o-2-0-houseboat-11-15-2016/

    floating city of modular, eco-friendly pyramids is now enrolling citizens https://www.designboom.com/architecture/floating-city-modular-eco-friendly-pyramids-pierpaolo-lazzarini-04-24-2018/

    A nimble, omnidirectional houseboat. It would only house me and maybe one or two other people, so I was thinking the round design similar to the ufo would be good.
     
  2. bajansailor
    Joined: Oct 2007
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    Location: Barbados

    bajansailor Marine Surveyor

    In a one word answer - NO.
    A racing hydroplane might manage to get up to 50 mph in a few seconds when going forwards, but I doubt that any other boat could.
    And all houseboats can only dream wistfully of these kind of speeds.
    I have to ask why you want to be able to get up to 50 mph in 2 seconds? If you have a need for speed, buy a jet ski with an 1800 cc engine in it.
    And what do you mean by the diaganols (or diagonals) at the back? I am a bit baffled here.
    They say that the UFO houseboat has an estimated maximum speed of 9 knots with two 80 hp electric motors - in their dreams maybe. That hull form has a LOT of resistance / drag.

    Edit - that UFO is definitely a wind-up - the second last photo shows the suggested method of 'delivering' a UFO - with a helicopter. :)
     
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  3. KyleF
    Joined: Oct 2019
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    KyleF New Member

    Imagine a circle with 12+ engines around the perimeter. You have a joystick that allows you to move in any direction.

    Why? Why TF not

    Maybe I want an omnidirectional hydroplane?
     
  4. bajansailor
    Joined: Oct 2007
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    bajansailor Marine Surveyor

    The nearest you are going to get to what you have in mind re an omnidirectional craft would be a hovercraft. But it certainly won't be hitting 50 mph in 2 seconds.
    Or a helicopter with floats for landing on the sea.......

    I am now trying to envisage an aquatic turbocharged version of the classic dodgem / bumper car...... if a jetski is too tame, would something like this work?
    https://www.qiledirides.com/Bumper/55.html
     
  5. KyleF
    Joined: Oct 2019
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    Location: Usa

    KyleF New Member

  6. Dejay
    Joined: Mar 2018
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    Dejay Senior Newbie

    From 0-80 km/h in 2 seconds would be something like 4 g force acceleration. Apparently the tesla roadstar can actually accelerate from 0-100 in 1.9 seconds. But that is on a road with good tire grip. You'd probably need some kind of rocket or jet engine.

    Seeing the contents of a house accelerate into different directions with those forces would be fun to see - per remote video feed!

    I believe with hydrofoils and enough batteries you could create a houseboat that can turn like a jet and lean into curves and the like. But you'd need very advanced engineering and control systems. But with the low power from solar this would not be more efficient for energy/distance than a displacement hull.
     
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  7. messabout
    Joined: Jan 2006
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    messabout Senior Member

    Kyle the irrefutable laws of physics make your houseboat a project of the forgeddaboutit type.

    Please review the implications in one of the more useful of Newtons laws: F=Ma
     
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  8. rwatson
    Joined: Aug 2007
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    rwatson Senior Member

    Maybe waterjets are part of the high speed, instant directional control idea


    waterjets.png


    jetpack.png
     
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  9. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    50 MPH in any direction in two seconds ? Try the Acme Products catalogue, next to Dehydrated Boulders.
     
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  10. gonzo
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    gonzo Senior Member

    To accelerate from + 50 mph to - 50 mph will generate 5.1 G's if the acceleration is absolutely constant. If it is not constant, there will be a higher peak. That is a lot more than a major earthquake. What kind of house are you building that is ultra lightweight and can withstand those forces? Any appliance will be destroyed.
     
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  11. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    No, that is not correct. The acceleration will depend on the time taken to change the speed.
     
  12. kerosene
    Joined: Jul 2006
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    kerosene Senior Member

    I get 2.3G

    2 secs to change velocity by 100mph. = 160kph so 80kph/sec=22.222m/sec/sec=22.22/9.81=2.3G
     
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  13. messabout
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    messabout Senior Member

    Kerosene, In either case the accelerations are far from any realistic expectation. The math is fun however. I suspect that the OP has not confronted the realities of the performance issues that he has prescribed. Not to demean him in any way. He came here for comments and perhaps will be given an incentive to study the physics of the concept.
     
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  14. kerosene
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    kerosene Senior Member

    Of course. OP must be trolling or a rude kid.
     

  15. SailDesign
    Joined: Jan 2003
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    SailDesign Old Phart! Stay upwind..

    The OP gave 2 seconds. Do the maths yourself, but I get 2.3g, same as Kerosene.
     
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