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Geometrical excercise

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Old 26 June 2010, 09:45 AM
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dpb
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Default Geometrical excercise

Heads slightly fuzzy this morning.....

Iv had an internal sleeve made up for a mast that came down ( in half ) a couple of years ago . The bottom half has a bow , about 7-8 mm ? but the top half seems to be true ( apart from the last 2 feet at the top , slightly) .

how far out from vertical is the top middle in relation to the bottom middle . Its 32' long total
Old 27 June 2010, 08:59 AM
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Leslie
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7-8 mm.

Les
Old 27 June 2010, 09:44 AM
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cheers , thats not too bad then - ill only be going slightly bettter worse/better on one tack then
Old 27 June 2010, 05:35 PM
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wayne9t9
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The clues in the question
Old 27 June 2010, 07:01 PM
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Over simplified...

If it is 8mm out due to a bend over say the 2nd 1/4 of it's length, then it will be 24mm out at the top !

dunx
Old 27 June 2010, 07:38 PM
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Thank goodness it wasnt that way wit the footie )
Old 27 June 2010, 07:40 PM
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Anyway Im backing Ghana now

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Old 27 June 2010, 07:49 PM
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Midlife......
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I picked out Ghana in the Works sweepstake

Shaun
32 Feet seems like a long mast........what's it from
Old 28 June 2010, 11:24 AM
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Leslie
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Originally Posted by dunx
Over simplified...

If it is 8mm out due to a bend over say the 2nd 1/4 of it's length, then it will be 24mm out at the top !

dunx
He asked for the top middle,Tthe top pole is true except for the top couple of feet. He wanted to know the relationship between the top middle and the bottom middle!

Les
Old 28 June 2010, 11:27 AM
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dpb
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Its off my boat ( 26 ') . yes the lower half has the bow in it ( sideways) the top half has no bow , well except for the last 2 foot , but quite minimal.

It came down striking a buildings gutter just aboiut half way up the mast

cant work out why its jus the lower half bowed - probably something to do with the shrouds ( wires) holding it up giving way incrementally

Last edited by dpb; 28 June 2010 at 11:29 AM.
Old 28 June 2010, 01:01 PM
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Leslie
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I have a fair bit of experience with masts as a radio ham. If they are guyed at the top only, it is very easy for the wind's effects to produce a bow lower down the mast. Maybe the mid guys if you have them were a bit slack.

Les
Old 28 June 2010, 07:34 PM
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dpb

Your mast is a bit bigger than the GP 14's I used to tool around in as a kid...............I guess there arn't many of of them about now LOL

Shaun
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