In search of Boat Design Help

Discussion in 'Services & Employment' started by Bukmaster9, Jan 20, 2021.

  1. Barry
    Joined: Mar 2002
    Posts: 1,428
    Likes: 229, Points: 63, Legacy Rep: 158

    Barry Senior Member

    At planing speeds the center of buoyancy is not very critical except for the nose up/stern squat at rest. There are many aluminum boat manufacturers who use the same Jig to build boats with varying lengths.
    We used a 21 foot jig and built hulls from 18 to 24 feet off it. While the 18's were a little squirrelly at speeds about 60 mph due to a little too much horsepower, anything else was stable at max speeds that were topping out at around 50 mph. Our power was inboard jets so we did not have the option of moving the engine and left all tanks in the same place. ie The same measurements from the transom forward. As the boats were meant to run on shallow rivers, we did not install trim tabs and
    with the exception of the 18's, never installed a Jet-0-vator to vary the thrust line to fine tune the boat attitude. ( they ran around 4 - 5 degrees at cruise)
    You will have the option with tabs and tilt to make optimum adjustments.

    The tunnel in the photo is something that you should throw out. You may be able to install a jack plate if you want additional fine tuning unless your bracket if fully locked in all positions and will provide this feature
     
    Last edited: Jan 21, 2021
    bajansailor likes this.
  2. Bukmaster9
    Joined: Jan 2021
    Posts: 19
    Likes: 1, Points: 3
    Location: New Orleans, Louisiana

    Bukmaster9 Junior Member

    So it sounds like I am overthinking this project? My take on these responses is to basically use common sense when positioning the big weight items (i.e. fuel tank , baitwell, center console). Also, I intend to remove all the recesses in the stern seen in the picture
     
  3. TANSL
    Joined: Sep 2011
    Posts: 6,626
    Likes: 446, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    The best advice that can be given is, indeed, to apply common sense. If you decide to apply common sense and perform some calculations, I offer to perform them at no charge to you, of course.
     
  4. Ad Hoc
    Joined: Oct 2008
    Posts: 6,973
    Likes: 917, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    Indeed.

    You need to satisfy yourself - on paper - first,... that the location and amount of changes you wish to introduce, will work.
    Do the leg work on paper first... it'll save you in the long run, and more than you may realise.
     
    bajansailor likes this.
  5. Bukmaster9
    Joined: Jan 2021
    Posts: 19
    Likes: 1, Points: 3
    Location: New Orleans, Louisiana

    Bukmaster9 Junior Member

    How can I contact you?
     

  6. TANSL
    Joined: Sep 2011
    Posts: 6,626
    Likes: 446, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

Loading...
Similar Threads
  1. Artashes Uliyanov
    Replies:
    10
    Views:
    609
  2. Nozferatu
    Replies:
    0
    Views:
    1,551
  3. arthurpollan
    Replies:
    1
    Views:
    2,077
  4. Artashes Uliyanov
    Replies:
    3
    Views:
    486
  5. CDBarry
    Replies:
    0
    Views:
    1,554
  6. ozzmat2
    Replies:
    5
    Views:
    2,744
  7. mash.mash
    Replies:
    2
    Views:
    1,701
  8. cgnortheast
    Replies:
    0
    Views:
    1,429
  9. Impressive
    Replies:
    2
    Views:
    2,417
  10. Darryl Adachi
    Replies:
    1
    Views:
    255
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.