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Going down the mine ... |
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Guest 
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Joined: 21 May 04 Location: United Kingdom Online Status: Offline Posts: 0 |
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 Topic: Going down the mine ...Posted: 07 Dec 05 at 7:25pm |
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Seems to be some differences of opinion here ... I have always found that kite up going downwind in a breeze lifts the bow and reduced the chance of a pitchpole ... in all classes I have sailed. ... and of course it is much more fun ... Any one disagree? Rick Edited by Guest#260 |
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Wave Rider
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Joined: 27 Oct 04 Location: United Kingdom Online Status: Offline Posts: 909 |
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Posted: 07 Dec 05 at 7:30pm |
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I have heard that having the kite up is trying to pull the top of the mast into the water therefore making it easier to pitch, but n my cherub experience, this isn't the case and we seem to have the bowflying high with the kite up. I wonder if the bow is so high becuase we get told how painful pitchpoles are so we move back a bit too far!
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-[Franko]-
Chew Valley Lake Sailing Club RS600 933 |
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Guest
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Joined: 21 May 04 Location: United Kingdom Online Status: Offline Posts: 0 |
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Posted: 07 Dec 05 at 8:01pm |
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I am sure this must be covered in Bethwaites book ... anyone know? Rick
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Stefan Lloyd
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Joined: 03 Aug 04 Online Status: Offline Posts: 1599 |
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Posted: 07 Dec 05 at 8:30pm |
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Not true in keelboats. They rarely pitchpole but bow digging in following by a broach is very common. Kite up definitely makes that far more likely. More fun with the kite up? Yes of course.
Edited by Stefan Lloyd |
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ssailor
Far too distracted from work 
Joined: 11 Oct 04 Location: United Kingdom Online Status: Offline Posts: 430 |
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Posted: 07 Dec 05 at 8:49pm |
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It depends ont eh situation and the boat - if youre sailing in constant
breeze the fairly even pressure in the kite lifts the nose, however in
really gutsy conditions bearing away fully poweder with the kite up
causes the nose to dip as the rig wants to go faster than the boat thus
pushing the nosed down! therefore if uve always sailed in vaguely ok
places u wont notice - until you come to our res
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Any one in need of quality carbon fibre work (tillers etc) at decent prices!
Int 14 Gbr 1244 'Nucking Futs' The New Port rule!!. |
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simsy
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Joined: 14 Jun 05 Location: United Kingdom Online Status: Offline Posts: 158 |
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Posted: 07 Dec 05 at 8:50pm |
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Well having the kite up downwind certainly makes things easier. From experience, it does feel like the kite lifts the bow when flying downwind, but also from experience, flogging the kite also seems to lift the bow (but maybe this is due to the boat slowing)....I really dont know, seems im just babbling nonsense. Maybe theres someone with some proper facts. |
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Jamie
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Joined: 12 Jul 04 Location: United Kingdom Online Status: Offline Posts: 164 |
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Posted: 07 Dec 05 at 10:37pm |
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Surely the bow only lifts because the boat is on the plane. It is easiar to get on the plane with the kite up obviously, but surely once you are on the plane it makes little difference. But given the choice fly the kite every time. |
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m_liddell
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Joined: 27 May 05 Location: United Kingdom Online Status: Offline Posts: 583 |
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Posted: 07 Dec 05 at 10:49pm |
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Apparently the kite does not lift the bow but lifts the whole boat up. CFD research conclusions: |
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Guest
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Joined: 21 May 04 Location: United Kingdom Online Status: Offline Posts: 0 |
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Posted: 07 Dec 05 at 10:51pm |
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there we go then ... get the kite up at all times rick |
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JimC
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Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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Posted: 07 Dec 05 at 11:13pm |
Since I wrote those conclusions I've also come to believe that the kite acts as a pitch damper, because as the bow pitches down I think the lift of the kite must increase and thus pitch the boat forward less, and the reverse as the bow pitches up. That's my additional theory to explain the steadiness. After all, if kites were truly pitching the bow up then twelve footer and R crews, with the exceptionally raked leading edge, would need to be trapezing in front of the shrouds to keep the bow down! The other thing is that if you hunt out the videos of Mango Jam on the Cherub web site there's one where they let the kite flog for a couple of seconds and you can see the bow lift as the pressure comes off. Edited by JimC |
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