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Chris 249 View Drop Down
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    Posted: 13 Feb 05 at 12:45am
Jim, can you (or Mr Wright who I assume may be a certain foil builder from a certain small island off the coast of another small island) tell us exactly why the 470 rudder is so expensive? I think you said some time ago that it was expensive because of the incredibly small tolerances to which they measure the flat sections in the middle and the allowed curvature in the leadintg and trailing edges, isn't it?

What's the situation with Finn and Europe rudders; they are more open aren't they? Are they cheaper to build or are they built to extremely tight tolerances mandated by foil shape and not a rulebook?

I'm using the Finn and Europe as examples because other classes (Canoes, to use one I'm into) are no-where near the same standard of sailing and competitive  pressure as the Olympic classes so cannot be good comparisons, surely.

Why in the world doesn't ISAF start trying to phase in cheaper stronger 470s? If the boats don't last anyway, why not bring in sandwich even if it has to be phased  in somehow to avoid everyone having to junk their boats straightaway?

Then again, when I was a kid everyone said 420s only lasted a season and it was BS as far as we could see, a fourth hand boat still won World Youth selection and titles against guys who have gone on the Team NZ, win multiple Moth worlds etc. Nathan Wilmot's brother said the same still applies IIRC. I think someone said that one of the top 470 crews has a 4 year old boat but I can't recall the details. Anyone know?

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JimC View Drop Down
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 05 at 6:11am
Originally posted by Chris 249

What's the situation with Finn and Europe rudders; they are more open
aren't they? Are they cheaper to build or are they built to extremely
tight tolerances mandated by foil shape and not a rulebook?

I understand the Europe foils are if anything worse. When you look at the profile of the 470 foil you can see its hardly a case of just running the sander up and down to polish it. But yes, Mr Wight could give a better answer.

Your guess is as good as mine as to why the 470s don't ditch all their interior layout rules and replace it with something that's properly engineered and lasts, but a completely undeducated guess would be that the investment required by small builders in small countries requiring a completey new set of deck mould tooling could be part of it.

And do you think that Olympic campaign 470 sailors would stop replacing their boats so often even if they did last better? While there's no doubt that some boats do clap out a lot faster than others I do wonder if part of it isn't that when people are desperate for any edge then even the slightest perception that the boat might be even fractionally less fast than it was when brand new might be enough to stimulate then wallet opening reflex. After all if the boats are identical and you just transfer all the settings over a new boat is a really easy decision - you're faster as soon as you slide the rags up the mast of your new SMOD.

If on the other hand you're going to commission a new design in a development class you've got to figure you're going to spend half a season off the pace hile you work it up and tune it, so if you buy a new development boat every 6 months you'll probably never be fast...

So I do wonder if the reason why most development boats seem to have such a long competitive lifespan is that there just isn't the incentive to change the boat regularly, so then you pay extra for a much longer lasting construction, and so it goes.. Most of the serious one design sailors at my Club have had three or four boats since I built my current Cherub, although to be fair, mainly due to rule changes, she's no longer a realistic outright Championship contender.
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Post Options Post Options   Quote I luv Wight Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 05 at 8:54pm
Originally posted by Chris 249

Jim, can you (or Mr Wright who I assume may be a certain foil builder


yes it's me Andy P   ( and Wight not Wright )

The 470 R with the narrow neck is more expensive cos i have to insert several layers of S-glass into the neck to make it strong enough. The rules are strict on thickness, so the layers have to inserted into grooves in the core + vacced down = lots of hours.

The rules also determine the weird shape - the blades are made within a few mm of the max or min ( depending on how the original idea was big or small). The narrow neck is not part of the measurement, and allows shaping over the whole width of the neck.
Sharp entry, circular arc section = low spray drag, low pressure peak = less ventilation.

However the blade does cost lots and is VERY heavy ( the min weight is very high)



Finn and Europe rudders -

also + or - 5mm on shape, and horrible shapes too!


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Chris 249 View Drop Down
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Post Options Post Options   Quote Chris 249 Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 05 at 1:21am
Thanks all.

I agree with all you said about strict ODs and competitive lifespan, Jim (although I've never gone into the question in depth with those who'd really know).

Actually when I interviewed Chris Nicho a while ago he was at the end of a period of testing that (he thought) indicated that a 49er was only lasting six months or so as a fully-competitive top-level boat - and Nicho is not a gear freak. But he also said that the competitive level in 505s and in the 18' skiff, even in Grand Prix days of pro sailors and lots of TV, was nothing like the competitive level of the Olympic circus -  which makes it hard to compare development classes and the major SMODs.
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Post Options Post Options   Quote Granite Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 05 at 1:16pm

Another difficulty with comparing the lifespan of a boat is the ammount of use that it gets.

A boat used for an Olympic campaign a the top end could be used on the water for several hours every day of the week, compare that to an amatures boat that is only out a couple of evenings and maybe one day at the weekend. In 10 years it may not have sailed as many hours as the olympic training boat does in 6 months!

If it doesn't break it's too heavy; if it does it wasn't built right
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Post Options Post Options   Quote tgruitt Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 05 at 2:29pm

must be difficult hanging on at that speed

Needs to sail more...
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big man View Drop Down
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Post Options Post Options   Quote big man Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 05 at 3:36pm
accelerated a little too fast maybe
keep it flat you t***
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Post Options Post Options   Quote bigwavedave Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 05 at 3:47pm
Or stopped a bit too quick
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Post Options Post Options   Quote redback Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 05 at 4:14pm
I think they've just sailed up and over the top of a wave.  I know that weightless feeling, I used to crew for a guy in the early days of the RS800.  He used to sail a Contender and hadn't got used to the extra speed of the 800.  In a breeze, at the windward mark he used to bear away so fast that my feet left the rack.  The solution was to kick him on the shoulder which gave me enough momentum in the right direction that there was a chance I'd come back to the rack in roughly the right place, rather than behind the boat, or infront of the jib!
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Post Options Post Options   Quote neil 4450 Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 05 at 4:48pm
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