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Re: Chine Radius

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  • sanmi
    Sounds like good advice! ... 1/2 ... well. ... effect ... location ... right ... sitting ... very ... also ... was ... and ... weight ... 3 -
    Message 1 of 12 , Jun 2, 2002
      Sounds like good advice!

      --- In bolger@y..., "m_doles" <m_doles@y...> wrote:
      > You might try using hard rubber softeners. Find some pads of hard
      1/2
      > inch or so rubber maybe a foot square and place it on the chines as
      > the slings are tensioned. This may spread the force. Mabe cutouts
      > of an old tire. milton
      > --- In bolger@y..., "sanmi" <sanmi@y...> wrote:
      > >
      > > The builder of my AS-29, Herb, was worried about hogging as
      well.
      > He
      > > wrote to Bolger and got a reply back saying something to the
      effect
      > > of "...it doesn't much matter where you put the braces - that
      > bottom
      > > is strong! But make sure you support the chines..."
      > >
      > > Based on that observation, I am not worrying too much about where
      > my
      > > braces are. I think I remember Herb saying he built the bottom
      > with
      > > the concavity (can't remember if it was on purpose!), so I -
      > > personally- don't think the choice or location of stands/braces
      > will
      > > make much of a difference. On the other hand, a simple bounce in
      > the
      > > slings or a momentary tilt while blocking probably caused the
      > breaks
      > > in the chine sheathing. I am pretty sure it happened to Alisa a
      > long
      > > time ago, maybe even the first year (1995). The real lesson I am
      > > taking from all of this is that a larger radius is good and heavy
      > > reinforcement is important. To help with storage, I'll be trying
      > > four long padded blocks under the chine next time, but there
      > doesn't
      > > seem to be much I can do about the slings.
      > >
      > > Frank San Miguel
      > > Wilmington, DE
      > >
      > > --- In bolger@y..., "willers32" <mwagner@f...> wrote:
      > > > Wow! This is good to know. I had planned on marking the
      location
      > of
      > > > bulkheads, etc. so the yard man would put the slings in the
      right
      > > > place. I hadn't thought of the weight of the entire boat
      sitting
      > on
      > > > the chines for the winter.
      > > >
      > > > It would probably be good to locate any winter supports at or
      very
      > > > near the bulkheads to spread the load away from the chines. I
      also
      > > > plan on using some jack stands (bought cheap from a yard that
      was
      > > > closing.) By putting the stands under the ends I am hoping to
      > avoid
      > > > "hogging" during the winters. That might be what created the
      > concave
      > > > warp you noted.
      > > >
      > > >
      > > > --- In bolger@y..., "sanmi" <sanmi@y...> wrote:
      > > > > Funny you should mention chine radius just now. I have an
      > early
      > > AS-
      > > > > 29 (http://www.geocities.com/sanmi/alisa/alisa.html), and she
      > > suffers
      > > > > from cracks in the chine where the boat is loaded on slings
      and
      > > > > mounted on blocks for winter storage (she is laid on railroad
      > > ties
      > > > > that are strung crosswise). The wood was crushed by the
      weight
      > > of
      > > > > the boat, probably as it was tipped unevenly when setting
      > down.
      > > This
      > > > > caused the glass reinforcement to crack. Another problem may
      > be
      > > that
      > > > > this hull has a slight convex shape to it amidships (not per
      > the
      > > > > plans), which would concentrate the forces on the chines even
      > > more.
      > > > >
      > > > > Over the years the cracks caused leaks and the moisture has
      > > caused
      > > > > some damage to the chine logs. The radius seems to be about
      > 1".
      > > > > Tahiti's chine radius, a much bigger boat, seems to be about
      3"-
      > > 4"
      > > > >
      > > > > I am in the midst of repairs right now.
      > > > >
      > > > > Whatever you choose, put plenty of reinforcement.
      > > > >
      > > > >
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