Projection 762 Help please?

   I'm no expert but I believe IRC is harsh on light high ballast ratio boats, ie sportsboats as it's more geared to high stability displacement boats. The projection does better on IRC than other more extreme sportsboats but still not as well as a "proper" yacht.
Compare with a Corby 25 for example which is a very succesful IRC boat. Compared to a projection it weighs a good bit more but carries more sail area. It draws more and has a huge bulb on the keel - seem to rate about 0.94 according to a quick google search.

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TimC Send Private Message Find Member's Posts Visit Member's Homepage Posting king Joined: 18 Oct 06 Location: United Kingdom Online Status: Offline Posts: 153	Post Options Post Reply Quote TimC Report Post Quote Reply Topic: Projection 762 Help please? Posted: 26 Jan 07 at 9:37am
	I'm no expert but I believe IRC is harsh on light high ballast ratio boats, ie sportsboats as it's more geared to high stability displacement boats. The projection does better on IRC than other more extreme sportsboats but still not as well as a "proper" yacht. Compare with a Corby 25 for example which is a very succesful IRC boat. Compared to a projection it weighs a good bit more but carries more sail area. It draws more and has a huge bulb on the keel - seem to rate about 0.94 according to a quick google search.
	J92s GBR 9224R "Upstart" twitter.com/upstart_racing

simono Send Private Message Find Member's Posts Newbie Joined: 15 Jan 07 Location: United Kingdom Online Status: Offline Posts: 24	Post Options Post Reply Quote simono Report Post Quote Reply Posted: 26 Jan 07 at 4:56pm
	my brother and i noticed the other day that the weight value within the irc rule does not account for the centre of graivity of the yacht. Therefore with a low weight to length value, the projection struggles. Imagine if the boat was made entirely from carbon fibre and had a bulb lead keel of the same draught. the ratings would not change apart from the 'hull factor' and obviously this would make a huge difference in medium conditions when the projection struggles (i think its the hull factor, cant remember without certificate infront of me). I think hull factor along with 'rig factor', are fudge factors for the rating rule. So this might be a reason why x-yachts perform well. (dont wish to be a sorry loser but there may be a deal between rorc and x-yachts?) i didnt say that!

garth weaver Send Private Message Find Member's Posts Groupie Joined: 09 Sep 06 Online Status: Offline Posts: 74	Post Options Post Reply Quote garth weaver Report Post Quote Reply Posted: 26 Jan 07 at 8:04pm
	Has anyone ever thought about fitting a bulb to the keel to increase weight/stability ratio and lower IRC? It would obviously reduce performance in really light stuff and result in the boat planning a bit later, but could pay significant divends in terms of rating improvement in medium conditions. As mentioned in an earlier post, a trial certificate @ 1500kgs, with 140% Genoa and 45 sqm kite would be really interesting!

DOUGk911 Send Private Message Find Member's Posts Visit Member's Homepage Groupie Joined: 23 Nov 06 Location: Blyth , Northumberland Online Status: Offline Posts: 65	Post Options Post Reply Quote DOUGk911 Report Post Quote Reply Posted: 26 Jan 07 at 10:39pm
	Nice Bulb ! My 762 is going to do without ! Thankyou . Don't understand too much about this handicap malarkey , just want to go fast . That big lump doesn't look like it will help too much to me . Anyone know if the " building 762's at this time in Poland " rumor has any truth in it ?, I can't find anything on net . Doug .

TimC Send Private Message Find Member's Posts Visit Member's Homepage Posting king Joined: 18 Oct 06 Location: United Kingdom Online Status: Offline Posts: 153	Post Options Post Reply Quote TimC Report Post Quote Reply Posted: 26 Jan 07 at 11:14pm
	Interesting about bulbs! As mentioned several times already in this thread, my proj has a 68kg bulb added to the keel which brings the weight up to 1308kg. It rates 0.972 and has a stability rating of 12. I'm going to race with it this year as is but I'm very unsure as to whether it should stay or go. Any ideas? Is it good or bad?
	J92s GBR 9224R "Upstart" twitter.com/upstart_racing

peter7623 Send Private Message Find Member's Posts Newbie Joined: 27 Nov 06 Online Status: Offline Posts: 5	Post Options Post Reply Quote peter7623 Report Post Quote Reply Posted: 27 Jan 07 at 11:27am
	Garth, what a lovely bulb. Before spending money and adding weight to the keel, I'd try sailing the boat with the weight well secured in the same fore and aft position in the cabin over the keel. I fear extra weight would lead to risk of nose dives in my favorite sailing conditions. In 30 knts we have had all the crew at the back of the cockpit,most behind the helmsman. (I think you were there Garth!).I wouldn't have fancied 150-200Kg extra ( two crewmen) up foward where the keel is. But well worth a try,especially if extra power means you can save on crew weight. However after 2years in Pink Gin I'd agree in general with Nigel Theadon of Crickey. Stay light and plane early to reduce the size of the 8-15 Knt medium wind displacement sailing window. Its more fun too. Peter Knight
	Peter

DOUGk911 Send Private Message Find Member's Posts Visit Member's Homepage Groupie Joined: 23 Nov 06 Location: Blyth , Northumberland Online Status: Offline Posts: 65	Post Options Post Reply Quote DOUGk911 Report Post Quote Reply Posted: 28 Jan 07 at 9:08pm
	Hi Guys , I'm planning to change my chainplates soon , have drawn blanks from local marine sources , we don't have too much choice up here , esp since all our ship yards have closed etc ... Can anyone put me in touch with a poss supply or drawing , I don't want to do any " development" work with interesting results . Thanks , Doug .

j hasson Send Private Message Find Member's Posts Newbie Joined: 12 Dec 06 Online Status: Offline Posts: 18	Post Options Post Reply Quote j hasson Report Post Quote Reply Posted: 31 Jan 07 at 11:26pm
	check out rowan yacht services. they'll provide you with all the info you need regarding the mod.

j hasson Send Private Message Find Member's Posts Newbie Joined: 12 Dec 06 Online Status: Offline Posts: 18	Post Options Post Reply Quote j hasson Report Post Quote Reply Posted: 31 Jan 07 at 11:29pm
	as a rookie projection sailor i was wondering how tight the rig set up should be. i understand it should be raked but how much?

DOUGk911 Send Private Message Find Member's Posts Visit Member's Homepage Groupie Joined: 23 Nov 06 Location: Blyth , Northumberland Online Status: Offline Posts: 65	Post Options Post Reply Quote DOUGk911 Report Post Quote Reply Posted: 01 Feb 07 at 8:11am
	Thanks to all who posted and contacted me re the chain plates , I have plenty of info now , a special thanks must go to Nigel from Rig Magic who telephoned me , he seems a font of knowledge re 762's having sailed one himself for sometime and having more than one incident with rig ! If you still have the standard chain plates it may be wise to at least inspect them or better still modify or replace . Doug .