Laurent Giles 'Jolly Boat' Exeter |
J24 (Sail No. 4239) Dartmouth |
29er GBR 074 Tynemouth |
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Tales from aFarr |
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iGRF
Really should get out more Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6496 |
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Topic: Tales from aFarr Posted: 16 Jul 18 at 3:58pm |
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No, not especially, it's raked. I lift it when I'm racing on deep legs, but no I tend to leave plates down until they become really noisy, but thinking about it that could have set a vortex going which transferred to the back foil it was quite bouncy in the short chop. |
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davidyacht
Really should get out more Joined: 29 Mar 05 Online Status: Offline Posts: 1345 |
Post Options Quote Reply Posted: 16 Jul 18 at 10:07pm | |
Could fit a fence to the top of the rudder blade to reduce aeration/cavitation, or maybe have a look at the area at the air/water interface to see if there is anything that might allow air to get drawn down the rudder blade that might cause cavitation ... flat leading edge or submerged rudder stock spring to mind. Also a poor (flat) airfoil section might lead to stall.
And smile when you see a camera
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Happily living in the past
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craiggo
Really should get out more Joined: 01 Apr 04 Location: United Kingdom Online Status: Offline Posts: 1810 |
Post Options Quote Reply Posted: 16 Jul 18 at 10:13pm | |
Sounds like not keeping the boat flat as a gust hits.
I can imagine with the Farr hull shape that it will overpower the rudder pretty quickly when heeled, spinning up into wind and throwing you into the middle of the boat especially if you are trapezing high. Keep it very flat by quick steering and quick easing of the sheet. Buy a heel gauge (like a spirit level) as used on Oppies and learn to sail the boat bolt upright. |
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OK 2129
RS200 411 |
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Do Different
Really should get out more Joined: 26 Jan 12 Location: North Online Status: Offline Posts: 1312 |
Post Options Quote Reply Posted: 16 Jul 18 at 10:45pm | |
Rudder hung off a gantry, any side effects?
You right at the back pressing the gantry into the water causing turbulence? If you are wiring that far back you are loading the rudder pretty heavily; maybe in your fun n games you got a bit too much heel on causing weather helm and a momentary heavy correction was simply a load too far resulting in stall. edit, sorry Craig......, got distracted mid two finger typing. yes what I was thinking. Edited by Do Different - 16 Jul 18 at 10:48pm |
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Fatboi
Posting king Joined: 09 Aug 16 Location: Hampshire Online Status: Offline Posts: 189 |
Post Options Quote Reply Posted: 17 Jul 18 at 8:44am | |
Try giving it a lift, will help when the gusts hit as the boat will have less drag underneath and start 'skipping' a little more. The board is pretty key in most boats offwind planing and most people leave it down too much thinking that it will make it all more stable.
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Sam.Spoons
Really should get out more Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3398 |
Post Options Quote Reply Posted: 17 Jul 18 at 9:42am | |
I was always taught to lift the CB off wind (Oppi, Heron, Enterprise and OK), around halfway on a reach and right up on a run, I was never taught it increased stability, actually just the opposite, the foil causes instability off wind as the boat can trip over it. In the Spice I set it for the conditions and leave it, too much else to do to faff around with the DB but the boat is uncontrollable with it fully up (even if that was possible without it getting in the way of the kicker and preventing you tacking or gybing). On the Blaze, I have upwind and off-wind positions, upwind varies depending on wind strength from fully down to about 15% back, off-wind is about 50%. Likewise the boat is un-sailable with it right up.
Edited by Sam.Spoons - 17 Jul 18 at 11:42am |
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Noah
Really should get out more Joined: 29 Dec 04 Location: United Kingdom Online Status: Offline Posts: 611 |
Post Options Quote Reply Posted: 17 Jul 18 at 11:06am | |
Me likewise Sam. Half board approx when three-sail reaching prevents the boat tripping over the board in a gust. It slips sideways instead. Beware the inadvertent board-up through either not enough friction or hitting e.g. jellyfish though. Result is crew in the water and a likely capsize to windward (embarrassing in 20kts!).
when running we have the board mostly up (75-80%) & kicker off. If the boat gets unstable a bit more board & a touch of kicker will stabilise it.
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Nick
D-Zero 316 |
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iGRF
Really should get out more Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6496 |
Post Options Quote Reply Posted: 17 Jul 18 at 11:53am | |
Was top of my thoughts.. It was quite broad and I was in the rear strap, the other suggestions heel etc do occur on tighter reaches and with the onset of a cross on, weather bow wave, especially if I ease the front foot to try and take the wave with the v of the hull rather than have it slam, it can then be a bitch to get bore off again. But it wasn't like that, it was a break out, there's something else it could have been, there are lots of jelly fish about, when i got back I'd been stung (which could have happened at the waters edge) but when they used to impact windsurf boards they can break the back out, so it could also have been that, slammed by a Portuguese Man O War! |
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iGRF
Really should get out more Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6496 |
Post Options Quote Reply Posted: 23 Aug 18 at 8:26pm | |
Well the adventure continues, I've had a couple of bad breaks, basically my trapeze wires which were a fabrication of my own device have failed a couple of times with me out on the wire and i've finally given in to reason and sheathed separate lines anyway that's not the news. The news is tonight, I got a 2nd, mainly because it was bloody windy to start with and only a few of us got out, but it was about as windy as we ever race in so I'm quite chuffed with myself for getting round with only the one capsize and that was a stupid one on the bear off where i hadn't dumped the kicker, mistakes do get amplified when the winds up. It was fair bucking about tonight almost getting airborne on the upwind leg into the waves. Best result I've ever had in a breeze, still can't get near the Contender yet, but I screwed up the start being over early and having a very dodgy re round. No doubt about it though this boat is made for a breeze, just wish I could find a way to get it to work in light weather.
Edited by iGRF - 23 Aug 18 at 8:28pm |
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Jack Sparrow
Really should get out more Joined: 08 Feb 05 Location: United Kingdom Online Status: Offline Posts: 2965 |
Post Options Quote Reply Posted: 24 Aug 18 at 10:15am | |
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