Striker 35 misbehaving

Discussion in 'Stability' started by jiggerpro, Aug 29, 2012.

  1. jiggerpro
    Joined: Sep 2007
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    jiggerpro Senior Member

    A friend of mine has a 35 footer 1977 Striker sportfishing motor boat, and he is bitterly complaining about the fact that whenever cruising downwind or even when encountering someone elses wake the boat bowsteers very badly, the aluminum yacht, has no strakes and a quite sharp bow, other owners have tried adding a small keel at the rear, or enlarging the rudders but it did not work.

    I am suggesting to try the behaviour with a heavier stern to help the boat lift the bow, and maybe also the addition of strakes or redans at the bow only as an attempt to lift the bow and prevent it as much as possible to be inmersed, since this is quite a complicated job I decided to be much better to ask some forum colleagues before attempting it.

    It seems to me that the builder must have had problems with this in the past because the boat has already a flat area in the bow and keel area with an orientation that makes you think it is there for lifting the bow purposes, any ideas ........ of what would the best solution, even if only a partial solution ??
     
  2. gonzo
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    gonzo Senior Member

    How is the boat loaded? It is typical of boats that they get full of stuff as time passes. If the boat float down by the bow, it may be time for the owner to unload some things.
     
  3. jiggerpro
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    jiggerpro Senior Member

    Hi, Gonzo, the guy, says everything has been tried, including having a lot of people at the stern and he says it behaves the same, but I also think the problem is related to a heavy bow or too narrow which has the same comsequences: bowsteer
     
  4. gonzo
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    gonzo Senior Member

    Do you have any photos? Several boats have been marketed with that name.
     
  5. Mr Efficiency
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    Mr Efficiency Senior Member

    Best plan would be to consult with other owners of the same hull and see if it is a common complaint or there is a problem peculiar to just this one boat.
     
  6. jiggerpro
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    jiggerpro Senior Member

    Hi Mr efi, the owner has already done that and it seems that every owner suffers from it or lives with it, other owners have added keels and enlarged rudders to try to reduce the problem, my friend just wants to improve the misbehaving as much as possible, he will soon send me some pics of the boat, but it seems that the builder had several complaints because he implemented a very suspicious flat pad forward of midship which is obviously there to correct the tendency of the boat to nosedive-bowsteer, as said I will soon put some pics of the boat here, but I think any remedy will only be a partial success and definitely a pain to implement.
     
  7. tunnels

    tunnels Previous Member

    Need to see pictures of the boat running !! need to see plans of the hulls . without seeing anything its pure speculation and will get you no where . if you give information you will get answers .
    Sound like our chinese friend with the cat a while back could be the same kind of thing . trying to make a boat do what it was never designed to do maybe !!

    I just noticed you said it has a sharp bow and that could be a big part of the problem it has little to almost no bouyancy to lift the front and the shape of the stem could also be a contributing factor . strakes are not what you looking for its simply a bad design and needs redesign .
     
  8. tunnels

    tunnels Previous Member

    Its broaching !!!

    Need to see pictures of the boat running !! need to see plans of the hulls . without seeing anything its pure speculation and will get you no where . if you give information you will get answers .
    Sound like our chinese friend with the cat a while back but his problems were at the other end of the boat .
    Sounds all a bit shady to me !

    I just noticed you said it has a sharp bow and that could be a big part of the problem it will have little to almost no bouyancy to lift the front of the hull!!, the shape of the stem could also be a contributing factor to all this as well. Strakes are not what you looking for its simply a bad design and needs redesigning and rebuliding , Broaching in any sized boat is really dangerous and could cause the boat to roll completely on its side and throw people into the water in the right situation .

    If its a new boat? go see a lawyer then get the designer and the builder and pin them to the wall and demand he fixes it or money back with interest !!!
    Anything that has to be added to a hull after its launched means theres a design and performance problem !!
     
  9. Grey Ghost
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    Grey Ghost Senior Member

    Fat chance. A 1977 boat with modifications from previous owners... survey and test drive before buying. Or make the best of it. It was built 35 years ago when common men could afford boats because there wasn't so much nitpicking ;) :D
     
  10. CMS
    Joined: Oct 2011
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    CMS New Member

    It is an interesting problem and sounds as though the balance between immersed areas fore and aft in not quite right. Increasing the rudder area may provide a solution but would need to see some pics of the boat out of the water.

    Hope this helps
     
  11. tunnels

    tunnels Previous Member

    Australians !! jesus wayne !! theres no rudder on the front of the boats in question !!!

    Im counting !!
     
  12. Grey Ghost
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    Grey Ghost Senior Member

    The first post said it has rudders. Does it have rudders or doesn't it have rudders ???????
    "other owners have tried adding a small keel at the rear, or enlarging the rudders"

    What do you mean "on the front"? What is a rudder on the front, of what ???
     
  13. jiggerpro
    Joined: Sep 2007
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    jiggerpro Senior Member

    The only decent picture of the boat the owner had is this one, and yes tunnels the problem is basically what you said lack of forward buoyancy and probaly a bad design as well.

    As a last hope, since strakes at the front provide with some lift ( when they exist) this may help a bit and hopefully combined with some weight shifting towards the stern the boat will be bearable.

    We just want to hear what people with more experience may suggest before "embarking" into serious work.
     

    Attached Files:

  14. tunnels

    tunnels Previous Member

    Check and see if !!

    Yip not a lot there to lift the hull up and keep it up !! its quite a big bow and stem the bouancy . need to be down low and getting bigger as it climbs up to the chine . I remember a bertrum fishing boat about the same size in Tahiti the sprayed foam in that section and built it up and then glassed over the top . but it was a glass boat! much easyer to doctor !!.
    Have a look at the very back of the bottom of the boat all the way across and see if it has any hollow any where need a straight edge 2 foot long and looking for hollows . if it has a hollow it will act like a built in trimtab and be constantly forcing the nose of the boat down and thats quite common with aluminium hulls only takes a small amount of hollow to make it happen and the faster you go the worse it is !!!!:(
     

  15. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    Good point, I never thought of that :rolleyes: ! I had a tin boat years ago that broached a bit, and I knew other boats of the same make that did not, sure enough it had developed a hook aft. Worth a look to see what the story is back there.
     
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