G'day,
Glad it is all coming together.
1) No problem with the hinge. Holding down the other side will need
some seriously strong material and some way of keeping it tight.
Could have a vertical hinge on the lee side of the hull and use
slightly flatter sections below the water than normal. This reduces
the closing force required as the big loads are pushing it shut..
Makes the folded boat a bit wider and means you probably have to tie
up windward side to the jetty (could try for a reduced rate with a 6m
hull!). A horizontal hinge on the deck and a string from the bottom
of the front section through a block at the bottom of the middle
section and then to a winch would do as well. It is a pretty easy
engineering task to work out the loads and what is required to resist
them. The devil, as usual, is in the detail.
Containerising it is no big deal if you don't mind glassing the ends
back on (a days work) when you arrive, and running a saw between two
bulkheads when you leave. Or put the hinge 3m/10' section back from
the bow. There may be an argument for having the hinge at the beam so
all the loads are concentrate in one place. .
Love the idea of making the ends into a tender. Not so keen on
flooding the stern. It should be long and light enough to pop out of
any waves.
2) The boom is attached to the mast via a bearing the same as the mast
bearing in the hull and restrained vertically. Leech tenssion is
achieved with a multi part purchase on the clew. Means the boom is a
bit bigger than normal, but it is very easy to use. An advantage of
this is that in a capsize the boom (250 kgs of buoyancy) can be
sheeted pointing downwards and the buoyancy will help right the boat.
3) The telescoping mast and the canted to leeward mast are different
ideas. Not sure how they would work together, but you would need to
lower the top mast after you capsized. The mast is plenty buoyant,
the problem is that it would get water inside it and this makes it
hard to lift. The canting also helps in light air, allowing the sail
to fall into shape.
4) The mast can be made pretty much as stiff as required. With the
mast over rotated, the leech pull is not directly in line with the
long axis of the mast. This often causes wing masts to bend in
strange ways.
5) The beams are removable, could be replaced with shorter ones, but
you would need some form of trolley to do so and would have to be
careful when the lee hull was unsupported.
Any other questions, please let us know.
regards,
Rob
On Fri, Nov 7, 2008 at 4:34 AM, heinrich_meurer
<meurer@airborneminescan.com> wrote:
Hi Rob and everybody else,
I have set my eyes on a Solitarry and if I can finance it I will have
one next year. I do not need comfort but speed and sea keeping ability
and look forward to sail stretched ovals around the next open 60 I can
find. My idea is to campaign the boat quite a bit. However there are a
few open questions I would try to get answers/solutions for with your
help:
1
There will be very few mooring spots available in Europe and shallow
waters in harbours are always crowded with small boats. Therefore
tying the 50´proa to a visitor dock will be almost prohibitive
expensive for any length of time (say 4 weeks between two events)and
dangerous because of unattentive yachties running over the low ends of
the lw hull.
I understand that there will be crash bulkheads. Is it a reasonable
approach to make the ends of the leeward hull detachable and have them
hinged to the crash bulkheads? Some added turbulence and added weight.
Added turbulence could be taken care of to a certain extent using
ultra tight fits. However there are advantages:
1.1
Increase length of leeward hull to say 60 foot (length is fast and
beats painting it Orange).
1.2
Place crash bulkheads at ends of a 39 foot centre hull so it fits into
a container.
1.3
Reduced port fees and generate more strange looks from innocent
bystanders.
1.4
It is easy to play with detachable ends – make them more wave
piercing, add spray rails,increase volume or manipulate length over
all for different races:-)
1.5
You could even use both of them as a tender in port - sort of a wave
piercing kayak. In that case you need a deep well to sit in - which
while the ends are attached to the hull could be filled with foam inserts.
1.6
Ends could function as trim tanks for lateral trim. Assume running
downwind in steep waves against the current (English Channel) and the
wave distance interferes with the hull length. Your bow will try to
pierce the wave in front and eventually to climb up and out of the
wave. At the same time your fully buoyant stern will also try to climb
up and out of the following wave. If flooded the stern end will have
no buoyancy. Of course that does not make sense in short shunting
conditions
2.
There is no traveller. How do you put pressure on the roach? Push down
vang or rigid connection between boom and mast? If the latter how does
the mast manage to rotate in relation to the boom axis. You need the
possibility to over or under rotate. How is it done?
3.
I understand that the mast on Solitarry will lean 7 degrees to lee and
use buoyancy to achieve some turtle resistance. If the mast at the
same time is telescoping you need a sizable watertight compartment in
the top part of the mast and this part will not slide over the bottom
part. How long is that part and what is the air draft of a "reefed"
mast? Or can you rely on the buoyancy of composite materials in the mast?
4.
For a generous square top main will the mast top be stiff enough? A
wing mast as planned should perhaps to just fine because the pull from
the main will be aligned with the long axix of the mastsection?
5.
Can the beams/hulls be made detachable with simple tools for dry
storage? For long time docking in expensive berths could they be
replaced with short home made beams of simple make?
Thank you for reading the entire post
Best regards
Henry
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