| Re: Adding a Shute to a Ncra 5.5 Uni
[Re: Timbo]
#43568 01/28/05 06:55 PM 01/28/05 06:55 PM |
Joined: Feb 2004 Posts: 3,528 Looking for a Job, I got credi... scooby_simon Hull Flying, Snow Sliding.... |
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Posts: 3,528 Looking for a Job, I got credi... | Tom,
I'll agree the 17 is very hard work to get the best out of it. But lots of twist down wind ? How much mainsheet do you actually let out ? I'd guess I let out about 18 to 24 inches max (allow the boom to lift maybe 4 inches) - But I am using the Alu mast and do worry it would snap in a big wipeout.
F16 - GBR 553 - SOLD I also talk sport here | | | Re: Adding a Shute to a Ncra 5.5 Uni
[Re: Wouter]
#43570 01/29/05 04:03 AM 01/29/05 04:03 AM |
Joined: Jun 2001 Posts: 74 Maryland, USA PRagen
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Posts: 74 Maryland, USA | And on the spinnaker thing earlier, the one on my boat 5.5 was very full cut, not at all like the newer taller, narrow ones, maybe that's why there was so much lee helm?
That can well be the case Tim. The first spis on the Taipans had to some extend the same behaviour. However since 2002 the spi cut is different and the leehelm is as good as gone. Also we are reaching higher speeds with these. The pre 2002 F16 spis were wrong in the cut somewhere. I second gettting a spi cut for your boat. Wouter I have a 5.5 with an older full spinnaker also. At first I had problems in higher wind of having too much sail forward, which wants to push the boat to far down wind, causing me to have to *push* on the tiller to keep it on course. But I found that if remember to pull the boards up (which is optimal for down wind anyway) that the tiller steering is fine. If you have tiller push, other options are to adjust the rudder rake forward (using adjustment screws in rudder casings) and/or the mast rake back to adjust for this.
Patrick Ragen Taipan 4.9 USA 274
| | | Re: Adding a Shute to a Ncra 5.5 Uni
[Re: Thomm225]
#43571 01/29/05 06:45 AM 01/29/05 06:45 AM |
Joined: Feb 2004 Posts: 3,528 Looking for a Job, I got credi... scooby_simon Hull Flying, Snow Sliding.... |
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Posts: 3,528 Looking for a Job, I got credi... | The amount of twist and how much sheet to let out is definitely a judgement call. It depends on wind speed, etc.
I was reading something about twist last winter in Bethwaite's book " High Performance Sailing." Then I checked some pictures of the guys that were pulling away from me downwind. They had twist whereas I was sheeted tight. Tested it last summer and the twist allowed me to stay with them or maintain a lead.
Tom
IIRC Bethwaite (I have the book too) talks about matching leach curves/exhausts between Spi (least control) and jib (more control) and mainsail (most control), which I agree with, but I feel we have to balance this against the need to support the mast too. This is why I advocate some downhaul when sailing down wind when it is windy, it opens the leach of the main, but still supports the kite as the bend in the mast is aft - this does then load the mast more in compression (but I've never been worried about this with the 17 mast as it is large in section / mass) - I am muchmore worried about the kite pulling the top forward and breaking in this direction.
F16 - GBR 553 - SOLD I also talk sport here | | | Re: Adding a Shute to a Ncra 5.5 Uni
[Re: Thomm225]
#43573 01/30/05 06:01 PM 01/30/05 06:01 PM |
Joined: Feb 2004 Posts: 3,528 Looking for a Job, I got credi... scooby_simon Hull Flying, Snow Sliding.... |
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Posts: 3,528 Looking for a Job, I got credi... | but I feel we have to balance this against the need to support the mast too. This is why I advocate some downhaul when sailing down wind when it is windy, it opens the leach of the main, but still supports the kite as the bend in the mast is aft - this does then load the mast more in compression (but I've never been worried about this with the 17 mast as it is large in section / mass) - I am muchmore worried about the kite pulling the top forward and breaking in this direction.
Scooby, I guess it all boils down to how far you want to push the envelope! You want to play it safe and finish 5th, 6th, 7th, or 8th that's fine. But if you are trying to stay with the leaders you tend to do things you wouldn't normally do while out day sailing. I never thought I would raise my spinnaker in 18 knots until I saw the boat " in front " of me do it and it was just the first downwind leg of a 3 lap race! Tom Tom, I don't usually play safe, and I usually win. I'd be the the last one to ease off, I've had my kite up in about 30 kts, but on a lake where if it does go TU the (very good) rescue guys will come and fish me out (and they have done ) I've also just remembered that the I17R, the kite actually goes to the same place (above the deck) on your mast as it does mine, so I think for any given sheet position/load, you would have less twist induced than on the shorter Alu mast that I have.
F16 - GBR 553 - SOLD I also talk sport here | | | Re: Adding a Shute to a Ncra 5.5 Uni
[Re: scooby_simon]
#43574 01/31/05 09:34 AM 01/31/05 09:34 AM |
Joined: Jan 2004 Posts: 430 Virginia Beach, VA Thomm225
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Posts: 430 Virginia Beach, VA | [quote]
[quote] I'd be the the last one to ease off, I've had my kite up in about 30 kts Which kite box or Texaco? And how long was your string? Tom | | | Re: Adding a Shute to a Ncra 5.5 Uni
[Re: Thomm225]
#43575 01/31/05 10:49 AM 01/31/05 10:49 AM |
Joined: Feb 2004 Posts: 3,528 Looking for a Job, I got credi... scooby_simon Hull Flying, Snow Sliding.... |
Hull Flying, Snow Sliding....
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Posts: 3,528 Looking for a Job, I got credi... | I'd be the the last one to ease off, I've had my kite up in about 30 kts
Which kite box or Texaco? And how long was your string? Tom Don't understand (and why do you always missof the last "end quote" UBB code ?
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