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most ever online: 54
(Members: 0, Guests: 54) on 01 Jul : 19:58
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Newest member: Daniel
18 September
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 fixed H/A board v gybing standard boardGo to page [1] 2 |
| Author | Post |
| brian.j |
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  Joined: Mon Jan 08 2007, 01:03AM Posts: 12 | Just a question id like to put to the more technical minded in the class.. Which is better?a H/A fixed board or a standard gybing board, both boards being in similar condition and equal weight. What are the advantages/ disadvantages of both? Brian IRL7852 | ||
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| SJLake |
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   Joined: Mon Nov 06 2006, 11:28PM Posts: 254 | I'd go for a standard Gybing board over a fixed HA board. Having said that I guess if you were good with your hands you would be able convert a fixed HA board to gybing. BTW I have a virtually unused fixed HA board to sell ..... offers anyone ? Simon GBR8955 | ||
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| Mike Holt |
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  Joined: Fri Dec 01 2006, 01:02PM Posts: 62 | H/A board, fixed or gybing is better than any previous generation board. Slightly higher and less drag upwind, much better wire running downwind. | ||
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| iain |
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 Joined: Mon Nov 20 2006, 08:46PM Posts: 49 | Will a H/A board fit straight into a modern rondar (1998 vintage), or are modifications required? | ||
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| Mike Holt |
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Joined: Fri Dec 01 2006, 01:02PM Posts: 62 | You will have to put in a new pin position, further forward, I am sure Ian Pinnel can supply the exact position and fill or cover the old one. You also get a little more loading with the H/A boards on the case but a '98 Rondar would be fine with that. Mike | ||
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| Mike |
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Joined: Mon Nov 06 2006, 11:55PM Posts: 23 | I happen to have a H/A Gybing 505 board sitting in my workshop (bit of a long story why I have it)  Anyway will it fit into Krywood case, ie Skippy Without too much work? | ||
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| Charlie W |
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Joined: Mon Nov 20 2006, 07:40PM Posts: 174 | could be a bit of a campaign. there are quite a lot of things you need to align and strengthen. Call me and we can discuss. Chas Charlie W | ||
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| Mits8269 |
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  Joined: Fri Aug 03 2007, 01:30PM Posts: 34 | Charlie, would be interested in the outcomes of that; could you send them on, please? Mits | ||
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| Charlie W |
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Joined: Mon Nov 20 2006, 07:40PM Posts: 174 | okay.....so 4 main issues/jobs to do. 1 - centreboard bolt The first issue is the c'board bolt. as the high aspect blades have a small lever (snout) at the top that holds the bolt hole, you need to move the hole forwards in the casing, to keep the leading edge of the blade (in a vertically down position) in line....otherwise you unbalance the boat. The hole needs to move about 9.5 - 10cm further forward in the casing, and is therefore right at the very front of the casing (where the case starts to curve inwards). So this part needs to be reinforced, to prevent splitting. 2 - reinforce the centreboard case where it meets the floor Because the head of the gybing blade - the bit in the centreplate case when sailing - is not completely rectangular (which allows it to gybe) it cannot spread its load as well when it is not in gybe. Therefore you often have to reinforce the right angle where the floor and c/board case meet. These have been known to split before. Not a massive job, but you need to get the resin right inside the crack, and probably create a carbon cover that goes 4/5 cms up the c/board casing, and 4/5 cms along the floor. 3 - shorten the blade if necessary The new blades will be too long for the older casing (that was the redesign that Rondar did at about 8800, to allow for a longer (hi aspect) blade. In 8555, we just cut off the bottom 3/4 cms, and rounded the blade and repainted it. Not a massive job - but you need to align it with the blade in the boat....you don't want to arrive at a venue to discover that you did not take off enough...! 4 - check blade width before you start..! Finally make sure that the blade fits the width of the case. The newer blades are around 27/8mm in width. that is why all the boats now have steel plates down the side of the c/board casings (which are moulded at about 31/32mm width). Of course the steel plates also do a good job of reinforcing the centreboard casing, which is why they are so popular. P&B or Rondar are really the only UK people you want sorting that out. Chas [ Edited Fri Apr 03 2009, 02:27PM ] Charlie W | ||
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| brian.j |
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Joined: Mon Jan 08 2007, 01:03AM Posts: 12 | Great info as usual Charlie,i have a problem with fitting the board to the boat....it appears our c/board bolt hole is further forward than the norm so we dont have enough room on the case to driil a new hole so as to keep the leading edge in the same place. Thing is our mast position measures up to the tuning sheets but the board leading edge is further forward. Is the boat balanced? i dont know for sure,but 8510 was competitive in her previous owners hands so we've decided to leave well alone for now. Any further thoughts on the subject would be welcome. Brian | ||
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| Matt Hart |
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Joined: Mon Mar 12 2007, 08:11PM Posts: 21 | I fitted a high aspect gybing board to 8694 last year. as far as the bolt hole is concerned it will have to be as far forward in the case as you can get it. but also the most important thing is the height of the hole because if it's to high then it may not gybe at all and if it's to low it will start gybing to early it's very fidderly but it can be done | ||
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| iain |
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Joined: Mon Nov 20 2006, 08:46PM Posts: 49 | How far can you rake a gybing CB back before it stops gybing and you lose that benefit? in our previous Parker the gybing CB used to rattle around inside the case as soon as we raked it back from the vertical (we got rid of it). Is this an issue with the current generation of CB's? | ||
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| Mike Holt |
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Joined: Fri Dec 01 2006, 01:02PM Posts: 62 | By nature they will be a looser fit than a fixed board and we now use a "gybe stopper" to lock the board tight for downwind or breezy conditions. This is essentially a V that locks the front of the board in place. | ||
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| Chazelb2 |
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  Joined: Wed Feb 21 2007, 01:41PM Posts: 1 | Hi Mike, I've just been fitting a new H/A fixed carbon centerboard from Phil Milanes into 8342 which you owned some time ago. I haven't tried it yet but I hope it will be ok. I couldn't put the hole as forward as I would have liked because of the board angle. The boat is still fine. Bertrand | ||
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| SJLake |
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Joined: Mon Nov 06 2006, 11:28PM Posts: 254 | Mike Holt wrote ... By nature they will be a looser fit than a fixed board and we now use a "gybe stopper" to lock the board tight for downwind or breezy conditions. This is essentially a V that locks the front of the board in place. Is that legal ?? Simon GBR8955 | ||
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| Norman |
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 Joined: Fri Nov 10 2006, 04:09PM Posts: 124 | I questioned that when I was in the states but apparently the gybe stopper is legal (according to Paul Von Grey at any rate). | ||
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| SJLake |
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Joined: Mon Nov 06 2006, 11:28PM Posts: 254 | Not sure that Paul has got this correct - under rule 5.6.1 "No temporary or movable insert in the centreboard case is permitted" If any part of the stopper is inside the case there's a problem. We had a lengthy discusion about this at the AGM in Adelaide specifically about small blocks to prevent the centreboard case closing under rig tension. The rule interpretation is that inserts are not permitted in boats after 8925 (permitted in earlier boats due to some construction issues) see 2007 AGM minutes. Simon GBR8955 | ||
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| Mike Holt |
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Joined: Fri Dec 01 2006, 01:02PM Posts: 62 | We believe they are legal, they are certainly not for displacing water from the case which I recall the rule being written for and have been used by many boats for a long time. Glad to hear 8342 is still good, originally that was Terry Kyrwood's own boat. Had for the time a cool answer for the board, 2 holes, forward one and an aft one in the case and 2 holes in the board enabling 4 options for placement of the board for different conditions. Mike | ||
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| Mike Holt |
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Joined: Fri Dec 01 2006, 01:02PM Posts: 62 | "No temporary or movable insert in the centreboard case is permitted" Would that mean a centreboard is illegal? | ||
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| SJLake |
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Joined: Mon Nov 06 2006, 11:28PM Posts: 254 | Hi Mike, Possibly ... athough common sense dictates that a centreboard case would be pointless without a centreboard in it ! The rule would be better worded: "No temporary or removable insert in the centreboard case is permitted" Simon GBR8955 | ||
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