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Topic: Stainless steel bar under space frame |
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Neil Ashby |
Posted: 26-Feb-08 17:11 |
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Hi all
What does the stainless steel bar do that is located under the space frame just in front of the mast? I cant see that it serves any purpose or takes any load due to the space frame being so strong and from 3 sides. Surely all pressures from the mast go thru the frame horizontally not laterally?
waiting for petes answer |
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Dave 1002 |
Posted: 26-Feb-08 19:18 |
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Hi Neil
The stainless bar in front of the mast holds down the space frame. With out it the frame lifts, because it is higher in the middle than at the sides, and at the same time the sides of the boat flex in wards when rig tension is applied. Not good for the boat. Or it could be the other way round, rig tension makes the boat flex in wards and the frame lifts. Any way you need it.
Dave
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Pete Lindley |
Posted: 26-Feb-08 19:28 |
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Correct Dave.
Before the bar we just use to tie the space frame down to the mast foot.
Pete |
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Neil Ashby |
Posted: 26-Feb-08 21:03 |
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Bugger the bar isnt attached in any way shape or form, well as long as nothing is going to break not to worried |
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Pete Lindley |
Posted: 26-Feb-08 21:13 |
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But what will happen is that as you load the rig tension on and the boat is sailing, the hull will naturally be forced to fold inwards and will in turn cause the space frame to move up in the air at the mast gate. If the hull is allowed to fold then the non flexible gel coat will crack......
If you can't screw the bar to the deck then at least tie the space frame down to the step. Use 3mm and rig up a big purchase system to pull the tension on and get the space frame down tight.
Pete |
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Neil Ashby |
Posted: 27-Feb-08 17:24 |
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cheers pete and others
Will get on the case before i sail on sat in the windy stuff.
Have to say i am amazed that the space frame moves it is a fair old bit of tubing! |
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rob |
Posted: 27-Feb-08 18:43 |
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When our bar came away from the deck there was a good two inches underneath it when you pulled the rig tension on. We noticed it when it became impossible to put 300 pounds on, no matter how much we tried. We had to replace screws into the deck but also had to run bolts right through the space frame to keep the bar in place there as well.
Not our current boat i might add, that bit of handywork is now in Italy.
Rob 1022.
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Bob Ladell |
Posted: 28-Feb-08 23:31 |
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The space frame isn't as thick a material as you might think. The tube wall is very thin indeed so not good at lateral loads - hence it's important to keep the loading longitudinal and to do so keep the mast gate at the right height.
Letting the space frame flap about in the breeze will seriously sap boat power as the whole boat will flex as Rob has described - a touch like a Xenon .............
Bob |
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