Restaurarea bărcii FAIL — Sailing Yabá #104

27 thoughts on “Restaurarea bărcii FAIL — Sailing Yabá #104”

1. Although it is great to have a large swim platform, with the davits and a tender hanging off the transom you are compromising it's structural integrity. The forces where it joined the boat will be touch asspeshaly if yo add half a dozen people with five gear. Personally I'd cut the platform in half to reduce the leverage at the transom but if it must be that large then get rid of the stainless. For your tender you need 70mm pipe.
   Another way is to have arms attached and hinged at the transom and a block and tackle or winch so you would lower the arms to connect the tender then winch the arms up like a boom and topping lift.
   In this way there will be no added weight to the platform as that base of the boom is back on the transom and the top block will be on the roof. And stowed the arms or booms will be near vertical keeping the weight close to the boat🏴‍☠️

2. Something with a frame and connected to the stern would be better and more useful. It wouldn't hinder the service platform at all. Just something that you can lash items to. It's going to have to be much larger stainless than what your using. The single stanchions you were trying to use obviously won't cut it. You need like a box frame there where part of the back of it is connected to the boat. You also have to remember too that your going to be putting diving gear on that platform too and then there is the issue of the outboard engine attached to the tender. Whatever you guys decide on your going to have to make a very sturdy structure there.

3. wow I question the quality of the welding, those valleys in the face of the pivot should have been grinded to form a clean surface for the weld, that is a given.

4. Boas….. solução simples. Duplique os canos. Faça como o Duca fez no arco duplos tubos soldados entre si fazendo assim um sistema mais eficaz. E utilize polias duplas. Coloque uma polia no bote Tb. Assim vc divide a carga entre elas, não utilize chapa reta para reter o peso no cotovelo elas dobram fácil

5. looks like you did not take full advantage of your pulleys. You only had a 2:1 purchase advantage, the standing end of the rope should have been secured to the lower end of the rig, giving you a 3:1 advantage therefor making it easier to raise the load (and not having to shock load the welded gusset by yanking on the hauling line, but at least finding out the gusset was not sufficient)

6. That swim platform is going to be a hindrance in a big sea. Alright for swimming but when you’re underway. Have a look around the marina at other boats davits. You’ll find some ideas of what you want.

7. Ben and MP. Well-documented and did enjoy this episode. MP, for a moment I thought you were going to do a Darth Vader impersonation with the welding helmet!!
   Ben, hope you hitting your head with that stainless steel arm didn't hurt too much!!

   Through each trial and error, a solution is made and I am sure you will sort out the davit issue for the dinghy.
   More than anything, not only do you resolve it, but the outcome is better and stronger💪!!

   Keep up the good work as usual and look forward to next week and your progress!!!
   Love your work!

8. Hi guys, why do you have to have the davids so high? As long as the bottom of your dinghy is on the leve of your platform its enough. This reduces the leverage.

9. You could get a lighter dinghy? ..That one looks knackered anyway.

10. Hi Ben & MP, it was such a pleasure to meet you at the Annapolis Sailboat Show. We watch your journey present and binge on your previous. Yaba is incredible and in the best of intentional hands. I did mention I , We would love to crew with you. Sailing on Yaba is a national treasure, and her iconic owners. Hopefully this opportunity might become reality for us. We will keep on watching and I am getting merch, you gave us stickers and a button. 💕👍⚓️😎 Jeri & Max, S/V Far Niente!

11. Great Job.. don't forget to seal that wood around the flange with an epoxy much like one would seal coring material when drilling a hole..

12. I was worried about that davit design just from the thumbnail, so I am not surprised. First, as shown, the derricks were not strong enough. But the other thing that concerns me is placing them at the end of the swim platform is a lot more load on the platform itself than I am comfortable with. Also, they could be in the way of loading something onto the platform if said load is very long.

    I had to do a bit of research to find out the official concept so I didn't have a wall of text that only half explains the concept.
    If this were up to me, I would do double derrick cranes, one on each side, mounted to the hull where hull and swim platform meet.

    For a visual explanation of a derrick, this video is the only decent explanation I came across with a quick search.
    https://www.youtube.com/watch?v=V6LbFi7YgLU

    But to explain in text, a derrick is:
    An angled boom where
    – one end is connected to a foundation (in this case, the hull of the boat)
    – the other end of the boom has a rope that goes to a second anchor point (in this case the back of the roof) that can be shortened/lengthened to move the end of the boom up/back or down/out.
    – A second rope goes from a winch, probably at the base of the boom, through the boom, out the end, and down, to lift the load.

    I would recommend a dual derrick system: One at each corner on the back of the hull, connected by a cross-brace at the end of the derricks, but it can only load from directly behind the swim platform.

    You could do a different arrangement to allow side loading, but it would mean adding a second axle to the joint to allow side-to-side rotation, losing the reinforcement of the cross-brace, and a setup that is probably very difficult to control the side-to-side angle (like how the two davits were swinging around wildly in the video during the attempt to lift the tender).

    What ever you decide, I wish you the best of luck.

13. Don't pull down on the davits to haul up the dinghy. Pull along the davit arm. Put a pulley where it bends so you can fit a small winch to each davit. That way the pull force is on the longitudinals. Pulling directly down effectively doubles the force down on the end of the davits. Given the size of the dinghy I think you need much beefier davits anyway.

14. Sometimes you need to fail, in order to succeed. Thanks again for taking us along on your journey.

15. Dont beat yourselves up about the davids guys trial and error thats all it is…you have alot of superstructure going on at the aft of the boat a world of possibilities to build on..even if the ones you have were triangulated some how too still allow the dinghy room too dock once its hoisted may give it the strength you need for it too work🦾🔥🔥🔥🔥

16. I think the davits are nearly there. The horizontal arm is too long. Shorten that, and the whole dynamic will change.

17. Geez, how many tons does you dinghy weigh?

18. Hi Ben and MP, It's nice to see the progress you have all made on Yaba. Things don't always work the way you envision, but that's okay. You can always use those metal tubes for something else.

19. Do your calculations and design before you start next time.

20. What you've built isn't properly triangulated. Run the same size pipe from the pully end to the base of the vertical pipe and it'll be strong enough to lift your dinghy. Try it before you throw everything away. What you had, thin sheet stainless at the 90 degree point, is no way to triangulate something. Triangulation is the strongest shap in geometry. Please try it!

21. The fabrication using just a welder and grinder is outstanding!!

22. I would think that to get the tender lift right you would need a much more serious solution with better solutions like suport links to the ship and between themselves, including a shackles at the bottom and sides so the weight isn't all focused on the tip. Take a look at other ships and see how their solutions has been made, that should get you lots of good ideas and clues on how to do it right. Good work and it's nice to see you testing solutions, sometime though experience and or logical sense mixed with understanding material weakness can get you very far along to get it right just by guessing. Talking to an engineer might help too actually. 😀

    Unless you want them to turn around, I thinking you are going to need a double connection between themselves and to the core of the ship like some huge framework for a cage. Nothing else will make that solution hold up to what you want it to do. But I might be wrong, so you should test things, just think it through a few more time and thing about how the real world will have consequences for how you want to use it. Asking questions like that is what engineers uses to make things safe, but then they call it other things like material strength and and such.

23. Love your John Deere hat Ben. Just a small set back on the lift system and you guys always take it with a smile. Love you both!!!

24. There's only two kinds of people: Those who make mistakes and those who lie about making mistakes. Not learning from what doesn't work is the ultimate mistake.

25. 👍🏽

26. And thats why you do tests …. umm next time when you hang onto something that is untested do it over the platform maybeeee :p

27. every day is a school day, the learning never stops. The Davits being able to change direction while lifting the dingy would not have helped, any way of locking them in place would probably help.

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