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Are one designs really all equal ??

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laser47 View Drop Down
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    Posted: 09 Nov 06 at 10:59pm

Re: Re: lasers from different regions

my old Canadian hull was far sturdier and better made than my new british one. I've also heard stories about chisels and screwdrivers and stuff being found in PSE boats as well as them having thin patches in their gelcoat where it hasn't been laid up properly

What I've seen so far of PSE boats doesn't do much to disprove this.The boat I sail with at the moment is right on the bottom boudaries of the class weight limits and also seems to have a curiously light nose. The weight difference between mine and several other similarly aged lasers in the boat park at my club is quite marked, so you can notice when you're sailing them and they're only about 100 sail numbers appart at most

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Post Options Post Options   Quote allanorton Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 06 at 3:23pm
As I understand it, the difference between roto-moulded boats would be minimal.  The moulds are CNC machined aluminium, not like conventional grp moulds which can be manipulted to vary rocker etc..  The whole process is accurately measured and automated, the same amount of plastic goes in the mould every time, & the mould gets spun about at the same speed, time, temperature etc..
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Post Options Post Options   Quote Deimos Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 06 at 12:26pm

Re: Lasers from different regions.

I've not heard about Lasers in Aus being faster, though am aware that the US supplied masts are softer than those from elsewhere. In general this is taken as meaning they do not last as long rather than affecting speed much. also, I guess being an entire continent having the same supply means that there is less likelihood of competing against others with a "better mast".

Ian



Edited by Deimos
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timnoyce View Drop Down
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Post Options Post Options   Quote timnoyce Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 06 at 11:51am
mmm, that is what I was thinking too. A rotomoulded boat should be able to be produced to very exact weights as it is determined by how much plastic powder/chips are put into the rotomoulding machine! The area which won't be exact will be the distribution of the plastic around the mould, so it would be possible to have thick or thin areas of the walls.

Most of the boats have a dual layer constuction with a rigid plastic on the outside with high aesthetic properties and then inside they are filled with an expanding foam polymer which adds rigidity to the structure without massive weight.


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Post Options Post Options   Quote foaminatthedeck Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 06 at 11:17am
I think the production was changed due to the early hulls cracking aroung high load areas.
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Post Options Post Options   Quote English Dave Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 06 at 10:34am
From a production point of view, I would think that you could put stricter weight tolerances on rotomoulded boats that are far more "production line" than GRP boats that are still effectively laid up by hand. The differences in the Rotomoulded boats would probably come mainly from any warping as they were released from the mould. Newer Picos may be heavier than the old but that may indicate a change in the design tolerances rather than inconsistancy accoss a batch.
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49erGBR735HSC View Drop Down
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Post Options Post Options   Quote 49erGBR735HSC Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 06 at 10:24am
Also another factor to consider is the tolerances of the Roto-mould boats. As they are not designed to be "out and out" racing boats, reckon the manufactures won't be basing their reputation on the finishes being as exact as their racing classes and it would be more economical to focus upon getting as many boats out of the factory than whether boat A and B are within a certain weight category (especially when they are going to relatively heavy anyway).

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Post Options Post Options   Quote foaminatthedeck Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 06 at 10:10am

Originally posted by BigFatStan

No wforgive me if I am wrong but it seems to me that rotomoulded boats probably come out at the same weight due to the process by which they are built - so there's your answer - go and buy Picos, you'll have nothing to complain about

As i undersatnd it your right but is the weight evenly spread, from boat to boat?

Old picos seemed lighter that the modern ones (they did break more easly)

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Post Options Post Options   Quote jeffers Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 06 at 8:48am
Originally posted by tickel

I may be wrong but I think that this boat was disqualified from the first race for being a few kilos below the 68 kilo mark. Under these circumstances I think it was the sailors "wot dun it" not smod variations.


I think you could be right there tickel.....

A conversation at the recent Blaze inlands had a Blaze/Tasar sailor recounting something very similar...about his own boat....

Oh well at least he knows for next time...

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Post Options Post Options   Quote BigFatStan Quote  Post ReplyReply Direct Link To This Post Posted: 08 Nov 06 at 8:43am
No wforgive me if I am wrong but it seems to me that rotomoulded boats probably come out at the same weight due to the process by which they are built - so there's your answer - go and buy Picos, you'll have nothing to complain about
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