bowsprit design 47ft motor boat

Discussion in 'Fiberglass and Composite Boat Building' started by grpqueen, Jan 6, 2011.

  1. grpqueen
    Joined: Aug 2009
    Posts: 14
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: uk

    grpqueen Junior Member

    I am building a motorboat out of an old mould I was given, but it needed tweeking.
    I have stretched it 4ft longer and 2ft wider. The bow was a temp stitch together, I have started to peeled back the mould at the bow, the stem has turner out great, but she seems a bit bull nosed at the top, I was considering adding a bowsprit to improve the shape,
    I am a laminator not a boat designer and wondered if any of you clever chaps might have some good pics or drawing you might like to share?
    many thanks grp
     
  2. gonzo
    Joined: Aug 2002
    Posts: 15,617
    Likes: 1,107, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Can you post the lines or photos?
     
  3. Landlubber
    Joined: Jun 2007
    Posts: 2,640
    Likes: 124, Points: 0, Legacy Rep: 1802
    Location: Brisbane

    Landlubber Senior Member

    grpqueen, so how did you increase the beam, just separated the moulds two feet...that would give you a very rounded bow.....we need more details to be able to give helpful advice instead of simple comments.
     
  4. grpqueen
    Joined: Aug 2009
    Posts: 14
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: uk

    grpqueen Junior Member

    photos

    She has a flared bow and very round nose at deck level , i can post a couple of the mould and a some of the inside of the boat and a couple of the bow out of the mould as the boat takes up all of the shelter cant get a clear view, hope this helps, grp
     

    Attached Files:

    • 236.jpg
      236.jpg
      File size:
      290 KB
      Views:
      960
    • 238.jpg
      238.jpg
      File size:
      276.3 KB
      Views:
      645
    • 150.jpg
      150.jpg
      File size:
      268.1 KB
      Views:
      1,267
    • mould.JPG
      mould.JPG
      File size:
      335.9 KB
      Views:
      1,254
    • 246.jpg
      246.jpg
      File size:
      370.2 KB
      Views:
      495
    • 201.jpg
      201.jpg
      File size:
      233.3 KB
      Views:
      1,013
    • 188.jpg
      188.jpg
      File size:
      370.8 KB
      Views:
      944
  5. grpqueen
    Joined: Aug 2009
    Posts: 14
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: uk

    grpqueen Junior Member

    landlubber, i hope pics give some info.
    yes i did just jack her apart 2ft,
    it took a bit of work to repare the mould and fake it back together well, but as i intend to dispose of the mould when im done, the stitch together was temp , to be used once.
     
  6. Landlubber
    Joined: Jun 2007
    Posts: 2,640
    Likes: 124, Points: 0, Legacy Rep: 1802
    Location: Brisbane

    Landlubber Senior Member

    OK, so with the moulds two feet apart, refabricate a temp mould to follow the same bow lines, they will meet about 6 to 8 feet ( I guess) in front of the current loa.

    Do it with lamipanel, screwed onto the moulds, the inner surface will need very little tidying up when demoulded.....use plasticene at the joints to do a temp fill, but remember the boat is easier to sand back than the mould is to sand down....and yes the boat will increase in length, but at least it will have a pointed bow, and the lines will flow naturally from the original.
     
  7. tunnels

    tunnels Previous Member

    Ah a glass person after my own heart !!
    Make a recess in the deck and make a seperate moulding of you bow sprit that can be bolted into the recess you manufacture into the deck . Use mainly unidirectional glass and double bias to hold all together and it will be like a greek war ship . Can mount your capstan and bollard etc etc all on the one moulding Just make sure you do your home work on the manufacture of your recess . If you have a deck mould just incert a packer in the from to take the new bow sprit shape . :D:p:)
     
  8. grpqueen
    Joined: Aug 2009
    Posts: 14
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: uk

    grpqueen Junior Member

    hi land lubber , I have all ready built the hull with a gellcoat finish, no need for major sanding. no i did not follow the orignal lines, just wanted some neat ideas for a bow sprits, lol
     

  9. Landlubber
    Joined: Jun 2007
    Posts: 2,640
    Likes: 124, Points: 0, Legacy Rep: 1802
    Location: Brisbane

    Landlubber Senior Member

    ...yeah, of course, sorry, just thinking out loud....anyhow, one very strong way to make a bow sprit is with well seasoned hardwood, get some old demolition wood, shape it up and glass it all in, it is surprisingly strong and stable. You will need a bow sprit cos the anchor will bash the short flat nose to death.
     
Loading...
Similar Threads
  1. fallguy
    Replies:
    41
    Views:
    902
  2. Sinnie
    Replies:
    17
    Views:
    570
  3. WalleyeSniper
    Replies:
    8
    Views:
    638
  4. alby joy
    Replies:
    4
    Views:
    980
  5. DogCavalry
    Replies:
    9
    Views:
    956
  6. ziper1221
    Replies:
    0
    Views:
    1,010
  7. bjdbowman
    Replies:
    49
    Views:
    5,274
  8. mustafaumu sarac
    Replies:
    12
    Views:
    2,037
  9. Dinghy in Japan
    Replies:
    17
    Views:
    3,378
  10. FUELGUY
    Replies:
    18
    Views:
    4,440
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.