Bow thruster installation

Discussion in 'Propulsion' started by Vronsky, Jan 20, 2020.

  1. Vronsky
    Joined: Apr 2014
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    Vronsky Junior Member

    Was visiting BOOT in Dusseldorf this weekend, and noticed how bow thrusters in mass production motor boats are installed these days, here's an example >>

    Bow thruster on the stern of a motor boat - ship mooring thrusters - Koop deze stockfoto en ontdek vergelijkbare foto's op Adobe Stock https://stock.adobe.com/nl/images/bow-thruster-on-the-stern-of-a-motor-boat-ship-mooring-thrusters/257173748

    Please note those 'seams' below the opening, as if the pipe has been sort of 'cut' into the hull...
    The construction doesn't seem to be the usual pipe that's inserted into the hull.

    Does anyone know more about this construction ??

    THANKS,
    V.
     
  2. Ad Hoc
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    Ad Hoc Naval Architect

    No images in the link?
     
  3. BlueBell
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    BlueBell Ahhhhh...

    I saw images both times I opened the link.
     
  4. Ad Hoc
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    Ad Hoc Naval Architect

    This is all I see:

    upload_2020-1-21_10-7-45.png
     
  5. bajansailor
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    bajansailor Marine Surveyor

    I can see the photos here - but everything is written in Dutch, whereas Ad Hoc's appears to be in English?

    <mod note: removed now that Ad Hoc has seen them; appreciate the desire to help, but attaching Stock photos themselves to a forum post here would seem to violate Adobe's copyright on the stock photos.>
     
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  6. Ad Hoc
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    Ad Hoc Naval Architect

    Ahh....thanks Bajansailor :cool:

    The recess, or cut into the hull as you cite, is down to the shape of the hull and not wanting to disturb the flow of water past the orifice. Since at speed an orifice like this will or could or can create turbulence/eddies. It can be noisy as well as loss of speed and erosion issues.
    So it is recessed slightly and the shape leading to and/or from the orifice is tapered to the hull shape to prevent the aforementioned.
     
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  7. bajansailor
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    bajansailor Marine Surveyor

    Ooops - apologies to the Moderator for doing that, I certainly didn't think for a moment that there would be any conflict as a result of me posting these photos.
    But I can see your reasoning - folk do get very uppity about copyrights (and possible litigation) nowadays.
     
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  8. Ad Hoc
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    Ad Hoc Naval Architect

    Im not sure?
    I have Adobe professional, so I don't know why I couldn't view them. If they are "locked" for some copyright/privacy issue, then why post them on a public forum?
    Doesn't make sense either way really....
    What you did was perfectly fine as far as I could see.
     
  9. Boat Design Net Moderator
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    Boat Design Net Moderator Moderator

    I don't think it's related to why they weren't viewable for you on the stock.adobe.com website -- the image appeared fine for me on the link above, so maybe something relating to location or a temporary issue with a CDN that site is using serving your region maybe.

    However, I want to be careful not to violate Adobe's Terms of Service which I don't think would allow their stock photos to be attached to a forum post here unless a specific license was purchased for each stock photo in question.
     
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  10. Ad Hoc
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    Ad Hoc Naval Architect

    My bad. My phishing/spam/ad blocker...ive just noticed it blocking the links.
    Once i allowed the link to view fully.... i see all the images now.
    Doh! :oops:
     
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  11. Vronsky
    Joined: Apr 2014
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    Vronsky Junior Member

    The fairing behind the orifice serves to reduce turbulence > hard to believe those vertical 'seams' are meant to do the same.
    Still think there's some reason in the manufacturing process behind it.
     
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