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  1. #1
    Petty Officer 1st Class
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    Default ideas to flip a boat over

    My father has a 1947 Chris Craft 18' Sportsman. We want to do some work on the bottom of the hull and are going to attempt flip it over.

    We have our own ideas but want to solicit other ideas before we do this.

    My fathers garage is more than big enough to accommodate the boat with plenty of room on each side of the boat, at least double the width and length of the boat. It has steel I-Beams running the width of the garage space about 15 apart. The engine is out.

    Anybody have any ideas how heavy this boat might be? We are thinking somewhere in the 2000 lbs range??

    Our ideas:
    Build a rotisserie
    Use heavy duty ratchet straps hanging secured to the beams. The thought is as we ratchet from one side the boat will begin to rotate and eventually with some help, roll over. The reality is it the boat will probably just slip. We don't think this is a very good idea.

  2. #2
    Captain erikgreen's Avatar
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    Default Re: ideas to flip a boat over

    As far as weight, 2000 would be about right for a modern fiberglass hull that size. I'd suspect a runabout type would be heavier, but I'm not an expert, so I'll leave that to others.

    On turning, there are plenty of ideas here, and even more on some of the boat building boards like the Bateau.com forums. I've seen rotisserie used with a harness on the transom as well as the strap method. You can stop slippage by clamping the straps at a certain point to the hull. Use through bolted attachment points with backplates, or wrap-around straps. Most cleats won't take that much weight.

    The simplest way to turn a boat that size is to use a bunch of tires to avoid scuffing, and get about 8-10 friends to help you roll it on the floor. Sounds like you have the space.

    Or, it sounds like your garage area has plenty of structure to use, so that should make it easy. A lot of us have to build gantries and such to do this stuff.

    Rule of thumb: Take it slow. Make sure there's no fuel in the fuel tank, all your reservoirs for hydraulics and water tanks are empty, and have some kitty litter on hand to catch spills. If you can, at each step of the roll try to plan for the boat "slipping" and trying to roll the rest of the way on its own. Some tires or an extra strap to catch a runaway hull can save pain, lives, and work here.

    In the spirit of helpfulness this board fosters, I'll suggest an idea no one has tried yet here: Forget turning the boat over. Instead, bungee yourself to the ceiling with a harness on your body under the boat, so the bungees hold you near the hull for easy sanding/painting

    Erik
    Sea Ray SRV-210 - Winter refit
    75-85 foot displacement hull trawler - gleam in my eye

  3. #3
    Chief Petty Officer
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    Default Re: ideas to flip a boat over

    im going to assume that this is a wooden hull boat? if so, the rachet strap may just pull the hull apart. I saw on another post a guy made a crate almost around his hull, then used the straps on the crate.

    Rotisserie would be a good idea, because then you could easiely flip it back and forth without too much hassle.

  4. #4
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    Default Re: ideas to flip a boat over

    like the one in this video??... http://www.splashvision.com/Video/14...2-Odyssey.html

    if so, i'd flip it very carefully...that's a beautiful boat.

    what kind of shape is it in, structurally?

  5. #5
    Petty Officer 1st Class Peter Eikenberry's Avatar
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    Default Re: ideas to flip a boat over

    Another (and I think a better) option. Don't roll it over. just roll it up 90 deg on it's side. I did this with a 17 foot sail boat. You build a light frame of 2 x 4's or 2 x 6 s to go on the top of the boat, with blocks that fit the shape of the boat so when it's on it's side it is supported along it's length. Otherwise there would be too much strain on any one point. You want to spread the weight along the length of the gunwale.

    Try to visualize a grid with the members that go side to side long enough so that when you rotate the boat up they reach the floor and take the weight.

    Attach the frame to the boat with two or three straps that go around the bottom of the boat.

    Lift one side of the frame until the boat is up on its side. Do the work. Lower the boat. Lift the other side to get any areas you missed. You may have to move the straps to get the areas under the straps ( I assume you are painting the bottom.)
    Ike
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  6. #6
    Fleet Admiral Mark42's Avatar
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    Default Re: ideas to flip a boat over

    A few members have had to deal with flipping a boat over. There are a few good threads about it on this forum. Have you searched fthis forum for this topic?
    1985 Bayliner 1600 Capri Cuddy, 1965 MFG Niagara Custom. >> MFG Video<<. >> MFG Project<< >>Bayliner Hard Top Project<< >>Bayliner Repower Project<<


  7. #7
    Supreme Mariner oops!'s Avatar
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    Default Re: ideas to flip a boat over

    the hull extension in progress thread has detailed pics of how to flip a hull.....read the index on page 1.........

    good luck

    cheers
    oops
    The Hull Extension Thread
    great info on all aspects on boat building with detailed information.

    http://forums.iboats.com/boat-restoration-building-hull-repair/hull-extension-progress-pics-234392.html

    IN MEMORY OF Our friend SpinnerBait_Nut LESTER WRIGHT July 31, 1953 - Nov 26, 2008 RIP

    IN MEMORY OF Our friend Tashasdaddy Robert (bob) Griffis. October 27, 1948
    November 29 2010 RIP

  8. #8
    Supreme Mariner oops!'s Avatar
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    Default Re: ideas to flip a boat over

    here it is


    http://forums.iboats.com/boat-restoration-building-hull-repair/hull-extension-progress-pics-234392.html
    flipping the hull ........post # 1582 pg 64 thru post #1589 pg 64

    you dont neet to use the fork lift or a tow truck.....two trees will do
    The Hull Extension Thread
    great info on all aspects on boat building with detailed information.

    http://forums.iboats.com/showthread.php?t=234392

    IN MEMORY OF Our friend SpinnerBait_Nut LESTER WRIGHT July 31, 1953 - Nov 26, 2008 RIP

    IN MEMORY OF Our friend Tashasdaddy Robert (bob) Griffis. October 27, 1948
    November 29 2010 RIP

  9. #9
    Petty Officer 2nd Class
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    Default Re: ideas to flip a boat over

    Hi,

    Here's one technique... http://www.duckworksmagazine.com/08/...ols/index2.htm

    But I saw another home-built contraption, (can't find the site now naturally) and it's really quite clever... You take boat outdoors and basically build two frames. Then you attach ply to the frames and cut into large circles. (Think of of your boat piercing the holes of two donuts.) Once the circles are secure and reinforced, it's relatively easy to roll the boat over to any degree... You can also save the circles for future work. As I remember, the builder was working on something like a 30 footer...

    Alan

  10. #10
    Petty Officer 2nd Class
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    Default Re: ideas to flip a boat over

    Yeah... Here's a reference to the "donuts" method... Check out Jay Greer's entry...

    Alan

  11. #11
    Commander drewpster's Avatar
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    Default Re: ideas to flip a boat over

    This is hard to explain so bare with me. If you have lift beams in your shop and the clearance to hang the boat on its side, this method works great. It may seem like overkill but I have an idea we are underestimating the weight of your boat. Wood boats are heavy.

    You need four lift straps. For you boat 25-30' straps should be enough. They should obviously be rated for the load and have loops at each end.
    You need at least two chain falls. Four is ideal, but two will work.
    You need four lengths of chain. 4-5' each heavy chain

    Wrap a strap around the boat and pass the end of it through the loop in a lasso fashion. Position the strap so that it will tighten or "choke" in the direction you are lifting. Wrap one strap toward the aft end and one toward the forward end of the boat. position the choke loops at the corner of the gunnels. (where the side meets the gunnels) Lift the boat up from the side until the boat hangs on its side.
    Now position two other straps in the same way on the opposite gunnels. Remember to position the loops so that they tighten in the direction you are lifting. Lift the opposite gunnels up from the bottom side of the boat choking in that direction until the boat hangs up side down.
    Lower all four corners until the boat is resting on your stands.

    If you are using only two chain falls (hoists) then use the 4' foot lengths of chain to secure the hanging boat while you lift the opposite straps. Four chain falls makes things go faster as there will be no need to reposition. It may be necessary to cross brace the inside of the hull with a couple of boards to keep the straps from squeezing the hull.

    You can buy all the stuff you need at Harbor Freight for a couple of hundred bucks. You do not need heavy chain falls as you are splitting the weight 4 ways. The straps are about $20 bucks a piece if memory serves.

    It is important that you are certain your beams will support the weight. Also be sure you have enough overhead clearance for the boat on its side and the headroom for the lifting gear. My company's body shop routinely flips semi tractor chassis using the same method in our fab area.

  12. #12
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    Talking Re: ideas to flip a boat over

    I forgot to take pictures which would explain this easily, I will try to explain.
    I hooked two big yellow tow straps to the purlins of my steel shops ceiling, to these I hooked up two pulleys made out of wheelbarrow wheels. I had to make a U channel with an axle to mount the wheels. I ran two big yellow straps aroud the pulleys and around the boat. I picked up the front with a come a long from the ceiling and the back with a cherry picker. I tighened the yellow straps around the hull till I had it hanging only from them. Then I just rolled it over. Be sure to go ahead and build cradles to support the top while it is still right side up, attach them first. These will catch the boat and keep it from continuing to roll over as they are bottom heavy and when you get the heavy side up, she wants to keep going. I took two hours to do this after I got the rigging made up. By myself. (this includes the time I had to take to roll it back right side up, cause I did not build the cradles first and it rolled too far. this was exciting and happened pretty fast, be careful!

  13. #13
    Lieutenant Commander drewmitch44's Avatar
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    Default Re: ideas to flip a boat over

    Cant ya just take it and turn it over so that way the bottom of the hull is up? That way it will be upside down. Just a thought. I have to be a smart *** sometimes LOL. I know a guy that stores his 19' center console upside down. He has a rig made up that he uses to flip the boat upside down. He origionally made it up to put anti-fowl paint on the bottom. Once he had all the pullies and what not he realized that it took him 3 minutes to flip it over. It took longer for him to empty the 2 cycle oil out of the outboard then it did to flip the boat over. I wish i would have gotten some pictures of it when i saw that setup.

  14. #14
    Petty Officer 1st Class
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    Default Re: ideas to flip a boat over

    Quote Originally Posted by salty87 View Post
    like the one in this video??... http://www.splashvision.com/Video/14...2-Odyssey.html

    if so, i'd flip it very carefully...that's a beautiful boat.

    what kind of shape is it in, structurally?
    Yes sir. Looks just like that. All mahogany except it is a little smaller. I believe that is a 22' and my fathers is 18'

    Structurally very strong. The boat has never been restored. However, it was well maintained and used in a NY lake up until about 4 years ago.

    We just want to redo some of the weak planks, seal it up, and repaint it with the copper paint. We may opt to do this upright. We will then sand, replace some upper planks, then refinish the rest of the boat. Not trying to make a show winner, just a very nice usable boat.

    We will then see if we can freshen the Chrysler ACE up a bit. Ran pretty good, but it is out and why not.

    Thanks everyone for the wealth of ideas! What a great bunch of folks you all are here!

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