The bulkheads I did were vacum bagged with the material wrapped around
the edges. I think most of the
compression load is being spread by the fact that they are still taped
in once you flip it over.
Christian
Steve Nichols wrote:
Hi Bram,
I appreciate your comments about the cradle. I would never use a
dolley with simple webbing to support the hull. I had a bad experience
with one of these in my previous sailing life.
You were right - constructing the cradle when you just want to get the
hull flipped and glassed is a time for patience!! - not always one of
my strong points.
I am taking care to ensure the hull gets good support at station 10 &
6 to make sure it retains shape after it comes off the assembly. As I
am now making the full cradle I am thinking about some mini wheels at
the front of it so that even when mounted on a dolley I can drag the
whole boat instead of lifting - important at the end of the day when
you are knackered. Another thing I will do is put a couple of loops of
spectra through the hull (may need a bit of cedar blocking at this
point prior to bonding) at station 10 when you get back to shore you
simply secure the boat to the dolley with some hooks on trapeze cleats
that are attached to the dolley. Voila your boat is now much more
stable on the dolley (You are basically increasing to beam of your
boat to the full width of the dolley) plus it is secured ready for
trailering
The bit about Christians idea that appealed was that I wouldn't need
to do the support for station 6 plus the hull in station 6-8 area
retains its shape absolutely as it should. The point you make about no
hybrid under these bulkheads would be a concern to me as the
compression loads at this point of the boat are going to be very large.
I am really starting to look forward to meeting everyone at DeSoto and
learning more about the Swift Solo. The stuff about Geogeon Bros and
hull stiffness sounds especially interesting.
Cheers,
Steve
*/BDally6107@xxxxxxx/* wrote:
Steve,
A couple of things to consider regarding the cradle.
First, you need a trailer cradle, launching dolly / storage cradle
anyway. I use mine for dock storage/launching, for launching off
the beach, and for storage and transport inside my van trailer.
If I had an open road trailer, I would use it on that as well.
The strap system that comes with the Seitech dolly is marginal and
not too good for storage when the wind is up--even when the boat
is tied down. The extra weight can be mitigated with "beach
tires" which have about twice the contact area of regular tires.
Always best to store a boat on something that is molded to the
hull shape or to susp end it by the gunwales. It is important
that the carpet be something that is very open and dries-even with
the boat on it. Also, you'll see that the one I built doesn't
require having an independent dolly.
Construction methods:
I don't really see much of a problem with running the strips
straight other than appearance (they don't show on the bottom of
the boat anyway). I would want for Christian to get some time on
his boat before trying his bulkhead method. I'm not entirely
certain how Christian dealt with tying the hybrid together under
the bulkheads (Christian)?
We will be giving a talk a Fort DeSoto about the finding of the
testing we've done with Gougeon. We believe we've isolated the
majority of the problem of hull stiffness degradation to bulkhead,
mast step, and chain plate compression where these items load the
deck and hull (tee into the deck and hull). The integrity of the
hybrid or cloth spanning these loaded areas may be crucial but
probably less on a wood cored skiff than on a foam or Nomex core.
Best regards,
Bram
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