Re: [bolger] To Cant or Not to Kant
In a message dated 5/29/02 11:59:30 PM Central Daylight Time,
teakdeck@...writes:
("aka"'s?) and support a narrow bench or "trampoline" outside the gunwales on
each side. The hull would then serve as a foot-well, keeping your hinder
parts high, if not necessarily dry, but at least out of the accumulating cod
fish bones/oyster shells/beer cans and water in the "bilge". Despite the
initial stability, you might, on occasion, want to trim it by the lee in
light air, to get the windward float ("ama"?) out of the water, and,
conversely, to get your weight to windward to increase stability in stronger
winds. This scheme would permit that and facilitate changing fore-and-aft
trim as well.
This scheme would definitely complicate assembly/disassembly, so it would
probably be a poor choice if the boat has to be transported in the
disassembled mode. Also, the effect of the "stretchers" on the distribution
of loads between the hull and the "ama"'s would need to be evaluated.
(With apologies to the genius who posted the real diagnostic test for the
difference between dories/sharpies/johnboats.)
Ciao for Niao,
Bill in MN
[Non-text portions of this message have been removed]
teakdeck@...writes:
> Also, anybody have an idea about seating in a trimaran? I mean, you have theI think I would run a pair of "stretchers" lengthwise between the cross beams
>
> stability to allow for benches or a bucket seat or whatever.
("aka"'s?) and support a narrow bench or "trampoline" outside the gunwales on
each side. The hull would then serve as a foot-well, keeping your hinder
parts high, if not necessarily dry, but at least out of the accumulating cod
fish bones/oyster shells/beer cans and water in the "bilge". Despite the
initial stability, you might, on occasion, want to trim it by the lee in
light air, to get the windward float ("ama"?) out of the water, and,
conversely, to get your weight to windward to increase stability in stronger
winds. This scheme would permit that and facilitate changing fore-and-aft
trim as well.
This scheme would definitely complicate assembly/disassembly, so it would
probably be a poor choice if the boat has to be transported in the
disassembled mode. Also, the effect of the "stretchers" on the distribution
of loads between the hull and the "ama"'s would need to be evaluated.
(With apologies to the genius who posted the real diagnostic test for the
difference between dories/sharpies/johnboats.)
Ciao for Niao,
Bill in MN
[Non-text portions of this message have been removed]
But what caused the deck to separate from the
gunwales? And only at the point <BR>
where the akas were bolted to the deck. Hmmm?<BR>
<BR>
I do think lashing the akas to the amas will solve the
problem, but nothing <BR>
is easy. I'll have to set up another pair of 2 x 4's
with notches in the <BR>
right places to make the lashing tight. The tolerances
are critical. <BR>
<BR>
If your beams are just bolted to your deck, you are
imposing significant loads in what sounds like the
"wrong" way. The usual practice is to convert the
loads that would seperate beam/ama into shear loads.
With lashings, a good detail is the Wharram system as
on the TiKi 26 and smaller, where blocks are placed
below each beam on the side of the hull, these blocks
are two piece so that a lip exists to hold the
lashings. blocks are placed on top of the beam,
inboard of the deck edge, alowing two seperate lashing
to come up from the sides, and anchor over the top of
the beams. There is a block bolted to the top of the
deck that fits into a hole in the beam as a further
key. the result is five blocks, all operating
primarily in shear, to support the joint.
Rigid systems woulk just as well. usualy the beam is
attached to a pair of minstrngth bulkheads, which
spread the load from beam end into a wide area of the
float skin through tabbed glass etc... the actual
juction can be acheived in many ways, a shleeve of
glass over the beam, with more glass drapped over
that, and glued directly to the buolkheads will
convert a lot of the separation axiety into shear
forces.
There are models for hardware, which seem prefered by
the Gougeons, for instance.
I wouldn't worry about the ama toe in, I just brought
it up because it is an interesting detail.
______________________________________________________________________
Find, Connect, Date!http://personals.yahoo.ca
gunwales? And only at the point <BR>
where the akas were bolted to the deck. Hmmm?<BR>
<BR>
I do think lashing the akas to the amas will solve the
problem, but nothing <BR>
is easy. I'll have to set up another pair of 2 x 4's
with notches in the <BR>
right places to make the lashing tight. The tolerances
are critical. <BR>
<BR>
If your beams are just bolted to your deck, you are
imposing significant loads in what sounds like the
"wrong" way. The usual practice is to convert the
loads that would seperate beam/ama into shear loads.
With lashings, a good detail is the Wharram system as
on the TiKi 26 and smaller, where blocks are placed
below each beam on the side of the hull, these blocks
are two piece so that a lip exists to hold the
lashings. blocks are placed on top of the beam,
inboard of the deck edge, alowing two seperate lashing
to come up from the sides, and anchor over the top of
the beams. There is a block bolted to the top of the
deck that fits into a hole in the beam as a further
key. the result is five blocks, all operating
primarily in shear, to support the joint.
Rigid systems woulk just as well. usualy the beam is
attached to a pair of minstrngth bulkheads, which
spread the load from beam end into a wide area of the
float skin through tabbed glass etc... the actual
juction can be acheived in many ways, a shleeve of
glass over the beam, with more glass drapped over
that, and glued directly to the buolkheads will
convert a lot of the separation axiety into shear
forces.
There are models for hardware, which seem prefered by
the Gougeons, for instance.
I wouldn't worry about the ama toe in, I just brought
it up because it is an interesting detail.
______________________________________________________________________
Find, Connect, Date!http://personals.yahoo.ca
http://www.thriftymariner.com/products/access.html
HJ
HJ
>
> I've got holes five inches or so in diameter at each end of each ama, where I
> figured I needed access to bolt the akas on. I thought I remembered a site
> that sold round hatch covers. Does that ring a bell with anyone?
>
> Also, anybody have an idea about seating in a trimaran? I mean, you have the
> stability to allow for benches or a bucket seat or whatever.
>
>
I did not cant the amas or toe them in. But then I didn't know I needed to. I
finished repairing the amas tonight and put on a coat of primer. Tomorrow,
some high gloss latex enamel and she'll look as good as new.
But what caused the deck to separate from the gunwales? And only at the point
where the akas were bolted to the deck. Hmmm?
I do think lashing the akas to the amas will solve the problem, but nothing
is easy. I'll have to set up another pair of 2 x 4's with notches in the
right places to make the lashing tight. The tolerances are critical.
I've got holes five inches or so in diameter at each end of each ama, where I
figured I needed access to bolt the akas on. I thought I remembered a site
that sold round hatch covers. Does that ring a bell with anyone?
Also, anybody have an idea about seating in a trimaran? I mean, you have the
stability to allow for benches or a bucket seat or whatever.
Mike Masten
finished repairing the amas tonight and put on a coat of primer. Tomorrow,
some high gloss latex enamel and she'll look as good as new.
But what caused the deck to separate from the gunwales? And only at the point
where the akas were bolted to the deck. Hmmm?
I do think lashing the akas to the amas will solve the problem, but nothing
is easy. I'll have to set up another pair of 2 x 4's with notches in the
right places to make the lashing tight. The tolerances are critical.
I've got holes five inches or so in diameter at each end of each ama, where I
figured I needed access to bolt the akas on. I thought I remembered a site
that sold round hatch covers. Does that ring a bell with anyone?
Also, anybody have an idea about seating in a trimaran? I mean, you have the
stability to allow for benches or a bucket seat or whatever.
Mike Masten