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Symmetric v Assymmeric Spinnakers

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Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Topic: Symmetric v Assymmeric Spinnakers
    Posted: 13 Aug 13 at 3:07pm
On the river where I learned to sail, a bowsprit would get stuck in a bush if you got close enough to the bank to be out of the current.
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Post Options Post Options   Quote i tick Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 13 at 3:00pm
Look young Fuller, my nurse is instructed to wake me up when something important pops up. never miss an opportunity. Anachronistic front end ? Do I have that?

What we should do is drug GRF (I have spares) and stick him in a GP with the likes of those helms leading the GP fleet at Largs. Some of the best sailors in the country....and they CHOOSE to sail daft old symetric GP's.
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 13 at 2:44pm
A lot of model yachts use a swing, or Balestron, rig where the boom carries on forward of the mast. The front of the boom swings out to windward as the main is eased. Normally they fly a jib off this forward bit of the boom, but you could fly a genny from it too. If the forward part of the boom was designed with the right flexibility it would bend off to leeward so that the tip was on the centreline when the boom was eased for a reach.
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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 13 at 2:26pm
Merlin Owners are bottom feeding pond scum gone rotten with excess alcohol consumption, no one cares what they think, Fireballers however could be offered redemption, GP? just don't, tick I know you're winding me up go back to sleep.

Rivers yep, get that, but again if somebody got the assym thing sorted then otherwise excellent platforms like the X1 & 0 could have been spared the anachronism of their front end.
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Post Options Post Options   Quote Dark Harris Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 13 at 1:43pm

OK so you are obviosly someone who sails an a big water with lots of space. I have sailed both but my home club is a river venue where space is limited and sometimes all we have is a beat and a run so a traditional kite works for us. RS 200's were originally built to be able to goosewing with a pole and short bowsprit and that worked well on the river but as usual the majority decided it was a waste of time (they mostly sailed on open water). One of the first eurocup events in Amsterdam had both styles going down the run with some straight lining with the pole and some banging the corners, and we still all arrived together at the leeward mark. Would have been different in a blow I am sure. I bet if you ask a fireball or merlin owner if they want to go asymetric the answer will be an emphatic no.

 

When they say you are too old you probably are, but do it anyway.
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Post Options Post Options   Quote i tick Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 13 at 1:15pm
By the way....have a look at the GP pictures from Largs. They may be tanks but.......
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Post Options Post Options   Quote i tick Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 13 at 1:11pm
One does wonder at the attractions of any kite on a small lake. Hence we sailed a Tasar. If I see a GP running dead down wind goose winged it makes the little kite seem pointless. However one early morning at Southport I remember a light tight reach the length of the lake. I flew the kite right on the edge, leach just  curling in, quick flick to correct. We were very light for the boat and we flew. That is when they feel so good. 
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Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 13 at 12:57pm
I think it would be helpful to generally banish the 'dead running' from this discussion.
If you think about sailing 'close to dead run' instead, it's useful to think that the cosine of the angle away from where you want to go is the ratio of your vmg to your boatspeed.
So 5deg off, 99.6%
10deg off 98.4%
15deg off 96.5%
20deg off 94%
40deg off 76%
 
So a sym kite sailing a few degrees off DDW only has to make a small speed improvement for it to pay.
An asy 40degrees off needs a one third boost in speed to overcome the fact that only 3/4 of its speed is VMG.
 
Hence boats which often don't plane do not really benefit from asy's.
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Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 13 at 12:47pm
Originally posted by JimC

...

One might ask why don't boards have spinnakers and so on so they can run deep [grin].
 
I think they call it kitesurfing?
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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 13 at 12:13pm
Originally posted by JimC



One might ask why don't boards have spinnakers and so on so they can run deep [grin].



Very difficult to pump (air row) a kite which is basically the boards action of choice if the wind doesn't deliver and at planing wind speeds the stability of a sail built of kite cloth just wouldn't stack up, the leading edge would collapse at the speeds they already attain was my opinion.
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