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ronk View Drop Down
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Post Options Post Options   Quote ronk Quote  Post ReplyReply Direct Link To This Post Posted: 05 Aug 10 at 10:39pm
Originally posted by Peaky

What happens to the mainsheet?


Easy. You have no strop. Instead you use each end of a continuous
mainsheet tied to those points. After the mainsheet comes to the helm it is
passed around the front of the mast before going back through the boom
and back to the other strop attachment point.

Yes, you still have to gybe once normally (or just always go through the
starboard gate) but if you're good at handling lots of rope you now have a
traveller upwind too.
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G.R.F. View Drop Down
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Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 05 Aug 10 at 10:42pm
Like the look of that scow fronted moth, its sort of what I'm looking to do
to stop the nose diving.

The mainsheet will have to be attached to a traveller which rounds the
front of the boom, if the going round the front rig ever becomes reality.

Thing to do with this, is 1) get the hull concept doing what it should do
with an appropriate normal rig.

2) try for the round the front rear supported rig. It would have to have a
head cap, that would double as a mast head float and house the pulleys
to hoist the kite so it' far enough forward to permit the rig to gybe round
the front simultaneously.

3) or 2)Try for foils that could retract when not in operation.


Plenty to do.

Edited by G.R.F.
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The Moo View Drop Down
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Post Options Post Options   Quote The Moo Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 10 at 8:18am
Perhaps to initially experiment with the rig you could get hold of an abandoned old Laser or such like, nail a traveller on the deck, adapt the mainsheet to suit and see what happens....
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G.R.F. View Drop Down
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Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 10 at 9:02am
Well I had thought about fiddling around with the RS100, but the controls
would all have to be altered, so it's probably better done from scratch.

Things like kicker controls, cunningham etc will all have to rotate. I'd had in
mind all that bit being built into a mast mount fixed into the boat.
TBH not something I've absolutely nailed down in my mind just yet.
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dics View Drop Down
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Post Options Post Options   Quote dics Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 10 at 9:28am

I like the idea of that. You can have some sort of locking mechanism in place to lock the mount in place for normal sailing so the controls are all in the same place and when you come to gybe switch it off and the the control "plate" can gybe with the mast. On the new gypbe lock it back on again. If you extend the plate half way back along the length of the boom you can attach a centre main to it too. You just have to make sure you don't come out the gybe too high or will get your ankles chopped off. Not sure what happens to the trap wire.

GRF - why don't you set up a blog?? It will be easier to follow your grand design.

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Post Options Post Options   Quote MattK Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 10 at 12:08pm
Upwind pace and easy in a breeze through waves would require a fine bow,
but to stop it pitching, just add a t foil
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The Moo View Drop Down
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Post Options Post Options   Quote The Moo Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 10 at 12:38pm
Are any of those old tunnel scow Int Moths still sailing in the UK... CVDRA events or such like. they look great fun!
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English Dave View Drop Down
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Post Options Post Options   Quote English Dave Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 10 at 12:48pm
Graeme, why do you even want the sail to gybe round the
front? If the boat is as fast as you want it to be the
apparent wind will stay well forward throughout the gybe
and I would have thought it would be easier for the boom
to take the traditional route. Certainly, for a boat that
may be prone to nosediving, sending several kilos of sail
and boom round the bows won't help.

I'd also be concerned about your tunnel hull idea. They
work best on flat water and you have waves and chop where
you are.

I know you don't want to consider a catamaran solution
but if you don't want to trapeze then you have to get the
leverage somehow to balance the large mainsail you will
need to outpace a contender. You have already taken half
a step in this direction by even mentioning a Vortex.

Stick a spinnaker on a Dart15 perhaps.

Best of luck anyway

English Dave
Ballyholme Yacht Club

(You'd think I'd be better at it by now)

Hurricane 5.9 SX
RS700
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G.R.F. View Drop Down
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Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 10 at 2:37pm
Originally posted by English Dave

Graeme, why do you even want the sail to gybe
round the front?


Because I've never really known any other way?

All my sailing career it went round the front, and so much easier it is, it's
only since I've been messing about in these old fashioned dinghy boat
things they have to have this cack 'crash bang wallop' handed angst every
time you go round a corner.

Now I accept if you have to have those wire thingies to hold the mast up
there is no real option - but.. Carbon Masts and all sorts of other
windsurfing paraphanalia demonstrated by the D1 & RS100 mean
unstayed spinnaker rigs are a reality.

However much folk might boast about planing gybes in dinghies, I've yet
to witness one as smooth or as fast as a planing gybe on a board and imo the
airflow over the sail re-adjusts better the way a windsurfer gybes.

BUT.. at this stage, I still accept this bit is still firmly under the heading
'fantasy' and in any change, hull or rig, the best thing is to get one
working first with a known quantity, then go for the other, so as I see it,
it's a three part project.

Oh - hang on maybe a fourth, I did want the rig to slide back and forth
on a mast track..

Edited by G.R.F.
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Post Options Post Options   Quote silverwood Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 10 at 3:08pm

Interesting concept.... but why a tunnel hull rather than 2 or 3 hulls? How about a challenger tri with assy spinny and a swivel sliding seat so you can sit out on the floats! Might even be able to use a larger main too!

http://www.noblemarine.co.uk/boats/dinghy/Challenger-Tri/

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