Affordable seaworthy cruiser

Discussion in 'Boat Design' started by goodwilltoall, Jul 31, 2010.

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  1. FAST FRED
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    FAST FRED Senior Member

    Beebe had a above/under formula for how much hull should be in the water for seaworthiness, later on this was proven to be incorrect. With Heresshoff's formula that would make jubilee over 6', the M65 with 5' draft proves that is not necessary. Good point about the dink.

    Apples and oranges.

    The H rule was how much draft was required on a sailing craft to not need a centerboard. 7-1 LWL to draft is OK.

    The Beede rule is for power boats to keep the boat seaworthy. It ( A/B above /below) measures the area below the vessel with the area above the WL 2 or 2.5 to one if memory serves

    I don't think the new bay condos with 3 stories and an oxygen tent (fly bridge) on top is what he had in mind for safe world cruising.

    The point was a safe sailing offshore vessel does not need huge draft to be seaworthy. Buoy racing is a different sport.

    FF
     
  2. apex1

    apex1 Guest

    You are right.

    But Beebe was wrong.

    His formulae are valid just to some extend and what he called a Passagemaker (he was the one using that term first) was in fact a good performing coastal cruiser, but not a proper ocean going boat.

    Therefore I always laugh my socks off, when one of the best selling so named "Trawlers" are promoted as "Passagemakers to the Beebe specifications". Marketing drivel....
     
  3. goodwilltoall
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    goodwilltoall Senior Member

    Greetings,

    Calculated jubilee displacement as shown on drawings with 13" draft at 13,500lbs. with the center of bouancy at 51.6% aft. This is just the hull without keel. If this helps would like to hear of some ideas for the sailplan.

    Looked at some Bolger rigs and the chinese gaff looks as a promising option and possible to even go with a single mast. What do you guys think of it?

    The M65 was brought up as just an idea of a long (sail) passagemaker. The racing version had a 75' awl mast and 8.5' draft. After the first 12 boats, they came out with the cruising version, with just 6' draft. They are very barrel shaped at midbody. They were well built and in accordance with abs standards. If buying one, the interior fiberglass panels which are non structural and are just snapped on would be taken off and a wood veneer installed.

    The idea with jubilee is to reduce draft which makes mast heights lower and low aspect.
     
  4. Pierre R
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    Pierre R Senior Member

    Junk rig, definitely a Junk rig.
    The M65 is no high quality blue water passagemaker

    Why are you setting yourself up to be the weak link in the seaworthiness triangle? Darwinism?
     
  5. goodwilltoall
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    goodwilltoall Senior Member

    Definitely no junk rig, no way.

    Btw, will redraw with slightly more rocker and depth to add more displacement. The straight shear looks good, but will have to add some curvature. The steering arrangement will be reworked as well.
     
  6. apex1

    apex1 Guest

    Who will redraw? Who adds the curvature? And who reworks the steering?

    YOU?

    We have seen many guys around here with dreams, miles above their abilities, but you try to beat them all.
     
  7. goodwilltoall
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    goodwilltoall Senior Member

    Apex,

    Its a tough job, but somebodyz gotta do it.

    Peace.
     
  8. Pierre R
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    Pierre R Senior Member

    Frankly there is nothing that you can do to tweak jubilee that will remove you as the weak link. Do you understand why you are the weak link in this scenario?
     
  9. mydauphin
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    mydauphin Senior Member

    After goodwill finishes Jubilee he is either going to build the flying submarine or an Atomic cannon, or may be a time machine, or may be travel to the center of the universe in his Trisonic-Plutonic Enkatroplane. He hasn't invent that one yet....
     
  10. wardd
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    wardd Senior Member

    the atomic canon has been done, it was useless
     

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  11. mydauphin
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    mydauphin Senior Member

    The new one will be solar powered.
     
  12. goodwilltoall
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    goodwilltoall Senior Member

    Greetings,

    Pierre, got keep going and work out the problems as they arise.

    Looked at Bolgers AS55: 55'-0" x 9'-6" x 3'-0" draft. 30,000lbs displacement with 1076 SF sail area. Can anyone find it at Bolger yahoo group and provide a link. Looks very similar with the full keel. Will use some details to improve jubilee. It has full standing headroom, have to say its about 18" to high in hull height.

    Peace.
     
  13. Pierre R
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    Pierre R Senior Member

    To which I say

    It would appear that you have no idea what I am talking about as you continue rambling on with nonsense.

    There is a reason they test a person thoroughly before letting them fly into space. Many who desperately want to go up do not make the grade on purely physiological grounds. They simply cannot hack space without danger of death and there is no out. You don't just simply get off. The sea my friend is no different. Everyone has their physical limits for motion and endurance. You are about to try to build a boat for a purpose where only a select few could handle the motion without significant risk to life and limb through fatigue, sickness and dehydration.

    I strongly suspect that jubilee will reduce you physically to a life and death situation within 48 hours in a fresh breeze of say 20-20 knots at sea. Jubilee could easily be found floating after the wind died with you in it dead. Why on earth would you set yourself up to be the weak link.?

    If you do not know how much you can take at sea and what type of motion you can take its best to err on the side of a boat with a very easy motion. You are unlikely to encounter winds above 50-60 knots but quite likely to encounter winds of 20-30 knots quite possibly for days on end. Rescue at sea is very difficult even with people who are able let alone someone disabled by dehydration, injury or sickness.

    What you need to understand about Jubilee is that you really cannot dodge the draft and build a flat bottom for work in the open sea.
     
  14. frank smith
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    frank smith Senior Member

    Bolger designed a boat close to these dimensions . It is a three masted schooner . Does anyone know what it was called ?
     
  15. wardd
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    wardd Senior Member

    after 333 posts is it affordable yet?
     

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