Italcraft 35 fast, get on plain problem

Discussion in 'Boat Design' started by tonipu, Jan 18, 2021.

  1. tonipu
    Joined: Dec 2014
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    Location: croatia

    tonipu Senior Member

    Hi

    I have boat Italcraft 35 fast, designed by Sonny Levi, one of the first with surface drive, i Have a problem to get on plain when is loaded with 12 passenger. I must say to some people to bome near bow and than after long hi got on plain, but then he goes very fast. I send some picture
     

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  2. tonipu
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    tonipu Senior Member

    Not bome, move near bow, sorry
     
  3. tonipu
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    tonipu Senior Member

    This is How the surfece drive looks, and big flaps
     

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  4. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    That ship, the one in the photo, I highly doubt that it would get permission to carry 12 passengers.
     
  5. tonipu
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    tonipu Senior Member

    Yes, i have permisione of croatia ship registry, after they inspected the boat, and i put 12 seats with arm rest, facing the bow direction
     
  6. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    Perfect, congrats. In some other country that wouldn't be posible.
     
  7. tonipu
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    tonipu Senior Member

    They have some reguarment the boat must pass; i made some modification. But anyway my question is if enlarge those flaps, Will i get easily on plane. They now are very big but narrow.
    It is one of the first version of the surface drive, fixed, now modern drive you can trim, and steer with them
     
  8. tonipu
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    tonipu Senior Member

    It is very eficent hull it can do 40kts and plus, weight 5500kg with Pasenger 6500kg and still in calm weather cruise at 30kts with 2 iveco 8061srm27 270hp
     
  9. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    Nice looking boat, welcome to the forum tonipu

    You need wide not narrow trim tabs/flaps.

    The aft region most has been cut away for those props. And now you have more weight and different LCG distribution than originally designed for the hull.
    You need to address this... since you now need more lifting surface aft, i.e. where those "pockets" for the props are located.
    Thus wider tabs, which take up as much space (lifting surface) as possible, to gain back what has been lost - the lifting surface to plane - which is influencing the you issue you have.
     
    DogCavalry likes this.
  10. tonipu
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    tonipu Senior Member

    I plan to wide the flaps, and i change originaly Engine with New iveco nef 250, 100kg lighter per Engine so in total 200kg lighter Engine i hope Will be better. The horse power are 250hp 2800rpm
    Previous Engine was 270hp 2700rpm i hope it Will help a lot with 200kg less in the back
     
  11. Ad Hoc
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    Ad Hoc Naval Architect

    Look at your flaps:

    upload_2021-1-19_8-10-37.png

    Compared to the original:

    upload_2021-1-19_8-11-21.png

    Notice how their flap covers almost all the region of the hull cut away, for the props...
     

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  12. tonipu
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    tonipu Senior Member

    Where you find this photo, seams from the same boat?
     
  13. tonipu
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    tonipu Senior Member

    I Will do like that
     
  14. Ad Hoc
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    Ad Hoc Naval Architect

    A simple 5 second Google search....
     

  15. Mr Efficiency
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    Mr Efficiency Senior Member

    Are we to assume the tabs can be completely withdrawn at speed, and not in the water at all ? If they can be, I would be tempted to apply a wedge at the trailing end, to get high lift there, if the structure would be up to the load. That way you would get two bites at the cherry, at the leading edge, and at the wedge.
     
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