Vitamin Sea - J-24 Tri Conversion Videos

Discussion in 'Multihulls' started by Delane, Jul 11, 2011.

  1. Delane
    Joined: Apr 2005
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    Location: Okinawa, Japan

    Delane Senior Member

    1 person likes this.
  2. whitepointer23

    whitepointer23 Previous Member

    looks like it worked out well delane. you have done a good job. where have all the experts gone that said you couldn't do it, they were quick to comment before you proved them wrong.
     
  3. Delane
    Joined: Apr 2005
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    Location: Okinawa, Japan

    Delane Senior Member

    Proof is in the Pudding

    Whitepointer,

    Thanks for your interest and positive commentary. On behalf of the experts or those that have been there done that before me I would say that most people tried to caution me with a project of this kind due to the type hull I chose and the complexities involved. They were just trying to protect my interest as an amateur builder or converter in this case. Everyone meant well and I took everything to heart and only discounted a few comments along the way. My current vision is to make her a little faster with the planned (and going to happen) modification of the main hull.

    Our winds are out of the SE this week at 10 to 15 knots and evenings cruises are a must. Tonight was great in fact Sailing along for a couple of hours in flat seas with my best friend George (the auto pilot) and a few other friends. What is your experience with multihulls? Hope you enjoyed the video.
     
  4. whitepointer23

    whitepointer23 Previous Member

    hi delane, i don't have multi experience apart from surf cats. i enjoyed following the posts as your build progressed. i do understand that most of the replys you got were genuine and mean't well .
     
  5. aussiebushman
    Joined: Oct 2009
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    Location: Taralga NSW

    aussiebushman Innovator

    Congratulations Delane - knew you could do it and the result proves the point.

    I know the experts are sincerely trying to help but many of the adverse comments are based on inappropriate premises, because many of these guys are so hung up on speed they seem not to realise that some of us are prepared to experiment to achieve a compromise for the sake of cost and comfort. You certainly seem to have achieved a great result.

    I have managed to get a double berth, galley, nav station and enclosed head into a 6.2 meter Trinardo hull design (with greater flare and volume) without making the result boxy and while retaining a sizeable cockpit and heaps of deck space. It has A Class hulls as amas, given much greater volume (thanks to suggestion from Richard Woods in particular) by adding foam formers and Paulownia strip planking. It is coming along nicely - maybe 6 months to launch.

    Congrats again - enjoy!

    Alan
     
  6. anhdtht
    Joined: Jun 2011
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    Location: VIETNAM

    anhdtht Junior Member

    oh ! I saw it. I think delane are very very comfortable for his weekend
     
  7. Delane
    Joined: Apr 2005
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    Location: Okinawa, Japan

    Delane Senior Member

    Bushman,

    Thanks for the reviews and I can't wait to see your project when completed.

    My boys had a great time on that trip and solidified their confidence in the boat.

    I have only about 12K US in the project to include the trailer.

    Laters.
     
  8. rapscallion
    Joined: Oct 2006
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    Location: Wisconsin

    rapscallion Senior Member

    What do you plan on doing to it to make it faster? And, could you tell us about the boat's performance?
     
  9. Delane
    Joined: Apr 2005
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    Location: Okinawa, Japan

    Delane Senior Member

    rapscallion,

    I've cut and pasted this from my original thread pg 7. Please let me know if you need further details of the plan. And with that said, I don't really have a detailed plan at this point. Ongoing and looking for some assistance and ideas for adding on the hump as I call it.

    More Speed!
    Planning to modify the Vaka in the following way and wish to gain some insight. The plan is to add a hump section to the center of the main hull in an effort to add buoyancy and in effect take out the inherent rocker design of the boat. Basically I want to stop the suction action that is created by the fat rocker design and reduce friction. Another way of saying is I want the hump to do what the hull did previous but in a more efficient manner so to speak without all the spray and drag factor. The rear U section (frame) would measure somewhere on the order of 16” wide X 23” deep. All frames forward would off coarse reduce in size due to hull shape to the center and then increase again forward before becoming narrow into a plumb bob wave splitting nose. The idea is to calculate enough volume to lift the Vaka about 8 more inches dry. With that said I’m sure I would need to offset the Ama’s as well to compensate for the titter factor. I’ve been thinking about this for a while and during a 25 mile broad reach leg last weekend I was convinced that the hump would provide additional speed. We hit 10 to 12 knots several times in about a 16 knot blow. Of course flying a Gennaker, 115% Jib and Main helped with speed. If anyone wants to see I’ve got Video of that day. Do you think I’m on the right track?
    Reply With Quote
     
  10. cavalier mk2
    Joined: Mar 2010
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    Location: Pacific NW North America

    cavalier mk2 Senior Member

    If you use a narrow waterline form with the monohull vaka donor flaring out above for accommodation you are following a approach used in many cats and tris for room with less drag. Getting the flare enough above the waterline can be important to reduce pounding. A donor boat without standing headroom could then get headroom etc.... and you could get rid the heavy laminate bottom section at the same time.
     
  11. SammyPR
    Joined: Aug 2011
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    Location: Puerto rico

    SammyPR New Member

    Mono to Tri concersion.

    I am planning to purchase a hunter h26 1994. It is a fix project already. Also, I was thinking "creatively" (the exact same idea cat purchase and all lol), and thought that maybe someone has thought about it. Lets, do some research on the web and that is how I found your original thread. Amazed with the project and how it turned out. I was wondering if you had a page with more detailed/consolidated information regarding the building of it. Especially in more layman terms. I am a windsurfer and motorboater that is planning to get into sailing. I already have a boat designer/engineer contacted to start the brain storm process. Anything you may share will be greatly appreciated. Honestly, I am not looking to beat any tri. It comes from the mentality that if I can get there a bit quicker. Why not? Especially. Without compromising cabin comfort. I imagine tha the h26 will be really good because it uses a water ballast, which in trimaran mode, i dont think it may need to be filled.

    Best Regards,
    Sammy
     
  12. aussiebushman
    Joined: Oct 2009
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    Location: Taralga NSW

    aussiebushman Innovator

    Hi Sammy

    For the amas, maybe consider finding an old Hobie 20 as a donor. It will save you a lot of work. If you want folding beams, look at the Scarab site. I tried to buy just the plan sheets for the folding system but Ray would only sell the complete set, so I worked it out for myself - not that hard by creating a full size template out of scrap ply. Can't comment on the main hull but Delane sure got it right.

    Good luck

    Alan
     
  13. Delane
    Joined: Apr 2005
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    Location: Okinawa, Japan

    Delane Senior Member

    Hi Sammy,
    I think you’re on the right track and the H-26 looks like a great candidate for a conversion, especially since you already have a centerboard and not a whopping lead keel like I had. With your water line you would need donor Ama’s of at least 20 to 23 feet. I used H-20 hulls and they seem to work fine and could be extended if needed. If you don’t need to trailer the boat around then you may consider fixed beams vice folding due to the complexities involved. Let me know if you have specific questions regarding my project.
     
  14. bruceb
    Joined: Nov 2008
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    Location: atlanta,ga

    bruceb Senior Member

    An extra hull

    I have a hull and deck that would be a good base for a "wide body" tri. I keep looking at it myself but I don't have the time or energy- and I already have a tri. 23'x9', light fiberglass, with a cored deck with a good under-body shape. FREE! to a good home- located in Atlanta, Ga, USA. Send me a private message if interested. B
     

  15. SammyPR
    Joined: Aug 2011
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    Location: Puerto rico

    SammyPR New Member

    Thanks! Both!

    Delane,
    Thanks for the prompt response! I was looking for the add to contact the owner and his add expired! Is not there anymore! Currently awaiting a repost. Thanks for the amas measurements.


    Bruceb,

    I wish i could just drive up the and get that spare hull you have there. Hopefully, someone can put that hull to good use. What is the size of that hull? Wonder how much would cost to ship to Puerto Rico?

    Aussie,

    Thanks for the insight regarding the amas. About the scarab site, i searched and foudn some motorboats, stinkers, lol. Which scarabs are you refering to?

    Kind regards,
    sammy
     
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