Tim Humphries sent us phots of the work he has done to rebuild old Rondar K-172 (GBR-172).
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hi
Thought you might like some horror
story pics of my Rondar K172 following
collapse of mast support frame and
side decks. I replaced mast support
structure with a single longitudinal
20mm pvc/biax glass sandwich then
decked over it. Sidedecks I just
ground back to paper thin laminate
in the failure areas and glassed up
again finishing with a glass veil which
gives excellent grip with no glass
splinters in your bum.
cheers
Tim Humphries

You did not find any wire inside the
boat running from the bottom of the
mast support up to the attachment
point where the shrouds are? Either
your boat is earlier or later than that feature.


-No but I should have taken the time
to fit them, the boat is stiff as a
board along its length but the shroud
points still lift slightly when I
apply f'stay tension, though it
doesn't seem to matter.




What sort of a tool did you use to cut through the
cockpit floor without cutting into the support
just underneath? I would first guess a circular
saw but then you made cuts at right angles and
you were able to turn upward at the front of the
cockpit.


-mostly a 4" diamond wheel,I may have
used an air hacksaw to get into tight
corners. There was a lot of cleaning up
for which I used a 4" angle grinder
fitted with a rubber backing pack and
a box of course sanding pads (24 grit)

 

 

 

 

 

 

You may know that over the years, the base of the
mast has moved aft to the furthest aft postion that
is permitted by the rules. Since the mast will have
very large shroud tension, there is a lot of compression exerted by the base of the mast
down to your fore and aft sheet.of 20mm
pvc/biax glass sandwich.

Were it me, I would create interior bulkheads that
run from mast base to the hull floor and angle
back and end at the inner shroud reinforcing plate.
Devil to cut out, fit and glue in place.

-Yeah, I looked at that but the weight
and time implications stopped me.
I did consider bonding a stress bulkhead across the cockpit front out to the
gunwales, but for practical reasons
settled for a structural cockpit front wall
only (each side of for/aft stiffener).

Incidentally it may not be obvious from
the pics but my for/aft sandwich stiffener
runs through the cockpit sloping down
from back of foredeck to front of c'board
case. I'm guessing this isn't legal!
My theory was that if I could get the
boat stiff between the sheeting point
under the mast to the forestay
point it wound work, I did measure from
the transom to the mast step in
accordance with a tuning guide I had
at the time, probably about
5 years old now.

 

 

 

 

 

   

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