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Composite laser mast released
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zippyRN View Drop Down
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Joined: 14 Sep 06
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Posts: 437 		Post Options Post Options   Quote zippyRN Quote  Post ReplyReply Direct Link To This Post Topic: Composite laser mast released
    Posted: 09 Dec 16 at 12:20pm
i do wonder how many of the tales of certain saolors being allowed  untrammeled access to  stock to obtain ' the best'  parts are  exactly that tales ... 

tht said any  wet layup  boat  will have variation in  weight  and balance ... 
but  not as much as other fibreglass  mouldings / modules in other uses where there was little thought or concenr  paid to  volumes  of materials used  (  sprayed  chopped  roving  + resin guns anyone )
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jeffers View Drop Down
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Posts: 3048 		Post Options Post Options   Quote jeffers Quote  Post ReplyReply Direct Link To This Post Posted: 09 Dec 16 at 1:12pm
Originally posted by maxibuddah

It used to be corrosion on the rivet hole and then the mast cracking along the line of it. You put the thing under a lot of tension on that rivet and it was rather unfortunate that it was always the upper one that went, which meant that the jagged edge came out of the collar and ripped the luff tube to add insult to injury, Why they didn't have the upper one at the back, cos that would have negated the issue a little.

Standard practice to keep the single rivet in compression although other thinking was that you should have it at the side.
Paul
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RS400atC View Drop Down
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Posts: 3011 		Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 09 Dec 16 at 2:45pm
It would have been very easy to design out the rivet.
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jeffers View Drop Down
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Posts: 3048 		Post Options Post Options   Quote jeffers Quote  Post ReplyReply Direct Link To This Post Posted: 09 Dec 16 at 2:47pm
Originally posted by RS400atC

It would have been very easy to design out the rivet.

I believe a design for a new collar that would achieve this was sent to ILCA and rejected.

It wouldn't have resolved the bending issue though.
Paul
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RS400atC View Drop Down
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Posts: 3011 		Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 09 Dec 16 at 2:50pm
Originally posted by zippyRN

i do wonder how many of the tales of certain saolors being allowed  untrammeled access to  stock to obtain ' the best'  parts are  exactly that tales ... ....

I have known it happen, in a different class, not Lasers or 400's.
Imagine turning up waving cash, 'I'll take a new boat, but it has to weigh less than X'.
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maxibuddah View Drop Down
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Posts: 1760 		Post Options Post Options   Quote maxibuddah Quote  Post ReplyReply Direct Link To This Post Posted: 09 Dec 16 at 10:29pm
The bending my mast suffered was usually due to speed of the death rolls it suffered not due to excessive kicker. As for the rivet, well at one time the laser folks used to put a red arrow on the collar to line up with the red arrow on the bottom section which inevitably meant that the higher rivet was in tension
Everything I say is my opinion, honest
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