Hi, Ben, and list,
>> I see nothing to prevent side-to-side movement in this setup
>
> The large-diameter line, or straps, once snugged up, have essentially
> zero stretch (you're looking at maybe a 2' run of, say, 3/4" laid
> nylon.) Also, compressing the dinghy tubes against the stern on the
> bottom and against the davit arms on top places a load on those lines
> and creates a very large amount of stiction between the lower tube and
> the stern (or the padding between the two), as well as some between the
> top tube and the davit arms.
This pressure comes from the lifting lines?
>
>> Not having the impressive welding setup you do, let alone any skills if I
>> did :{/), I'm unable to attach cleats permanently
>
> Hey, you'd be mounting stainless to stainless - and I know that you can
> drill and tap. :) Besides, if we run into each other, I'd be glad to
> raft up with you and throw a bead or two on it.
There's this problem with the tubes having wires inside of them...
>
>> As long as I have your engineer's mind engaged, perhaps you could
>> speculate
>> on how to overcome the lifting challenges I have:
(clip)
>> the support arm mentioned above. There's my graph-paper sketch of our
>> arch,
>> as well as lots of pictures, in our gallery, if you're interested...
>
> Yeah, please give me the URL. My brain isn't engaging with your verbal
> description too well; not your fault, I just feel like it's packed in
> thick grease today. :\
http://justpickone.org/skip/gallery/ (top line on my sig); the first icon is
the sketch I did of the side of the arch I wanted built.
Clicking that gives you subgalleries, same icon will open my arch stuff.
Those start off with my drawings for the welder. Clicking any will get you
the larger views. After the drawings and specs are the others I looked at
for ideas.
>
>> Walker Bay's factory solution to my dilemma, apparently common, as it's
>> plastic, and not fiberglass, making it impossible for hard points inside
>> the
>> tubes area, is to put eye bolts in the removable-paneled floor system
>> ("the
>> bilge" feature on the Genesis models), make a lifting bridle, and haul
>> away.
>> They claim full safety in a dinghy filled with water; we have nothing
>> other
>> than the seats in ours when we hoist. However, there has been
>> significant
>> deformation of the floor system, and damage at the front where there's no
>> forward latch for the locker section, due to the lifting stress on
>> whatever
>> type of plastic it is that it's made from.
>
> Yikes. That doesn't bode well - I have a Genesis dinghy myself.
So, how do you hang it? I have not yet put any pix on the gallery, but I
sent a nauseating bunch of them to the WB folks after finally reaching the
guy I'd gotten that info from at the Annapolis show a couple of years ago.
>
>> Our dinghy hangs out notably from both sides of the arch, so there's no
>> practical way to hoist using the davit arms, using their hard points,
>> without a significant angle as it's raised (our lifting points are much
>> closer together than theirs), or using a bar (making it impossible to
>> lift
>> high enough to prevent swing) to accommodate that difference (never mind
>> what we're supposed to do with it when it's not slung!)...
>>
>> Does this presentation "parse" sufficiently?
>
> This latter part is clear enough. Hmm... bear with me while I talk this
> out. What if you cut the upright tubes of the davit a few inches below
> the bend, then insert a short piece of heavy-wall stainless tube that
> fits snugly inside it? You could then drill and pin the lower end of the
> insert, which would allow you to pivot the arms. Set them in their
> original position and drill through the upper end of the insert and the
> bottom of the arm; then, rotate to (say) 30, 45, and 60 degrees and
> drill through the holes in the outer tube. This would give you a set of
> davits that can be nicely adjusted for width (although it'll change the
> amount of setback on the arm ends). When you've set the position that
> you want, just insert a ball-lock clevis pin and lock it in place.
>
> Would something like that help you?
I'm not getting the picture, I think. We don't have any upright tubes - the
arch is the support for the horzontal tubes. My drawings should make our
setup clearer, I think...
Thanks for the help...
L8R
Skip, enjoying a squall at the moment
Morgan 461 #2
SV Flying Pig KI4MPC
See our galleries at www.justpickone.org/skip/gallery !
Follow us at http://groups.yahoo.com/group/TheFlyingPigLog
and/or http://groups.google.com/group/flyingpiglog
"Believe me, my young friend, there is *nothing*-absolutely nothing-half so
much worth doing as simply messing, messing-about-in-boats; messing about in
boats-or *with* boats.
In or out of 'em, it doesn't matter. Nothing seems really to matter, that's
the charm of it.
Whether you get away, or whether you don't; whether you arrive at your
destination or whether you reach somewhere else, or whether you never get
anywhere at all, you're always busy, and you never do anything in
particular; and when you've done it there's always something else to do, and
you can do it if you like, but you'd much better not."
_______________________________________________
Liveaboard mailing list
[email protected]
To adjust your membership settings over the web
http://liveaboardonline.com/mailman/listinfo/liveaboard
To subscribe send an email to [email protected]
To unsubscribe send an email to [email protected]
The archives are at http://www.liveaboardonline.com/pipermail/liveaboard/
To search the archives http://www.mail-archive.com/[email protected]
The Mailman Users Guide can be found here
http://www.gnu.org/software/mailman/mailman-member/index.html
