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Idea to reduce tower guy wire footprint | 9 comments (9 topical, editorial)
Re: Idea to reduce tower guy wire footprint (3.00 / 0) (#3)
by zinguvok (gmail.com is where zinguvok is at) on Sat May 10th, 2008 at 06:22:27 PM MST
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Martin, I read this and wrote it off -- but something felt hinky, so I came back and reread it. I would very strongly suggest you include a side view -- as I believe the previous two posters thought this tower was fully self-supporting since there are no visible guy wires. I think it might be a workable design, and I have to admit my curiosity is piqued. Folks, I'm pretty sure what Martin is giving us is a face view -- and the side view would appear to be one vertical pipe guyed from the top and maybe one other point. I think he's showing us a tower where there are no guy wires perpendicular to the tilt plane, only lattice framing -- which gives the tower a much narrower footprint. Interesting.



Re: Idea to reduce tower guy wire footprint (3.00 / 0) (#4)
by wpowokal on Sun May 11th, 2008 at 12:03:21 AM MST
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Zinguvok, my 40' 3 leg self supporting comercial tower has a footprint of around 6' between legs, therefore if one extrapilated this out, 20' is possibly feasable for 80'.

But! at 80' a 10' turbine has great bending force, this is realy (as usual for towers) a matter for a structual professional.

I suspect the diagram posted was a simplified diagram only, which to me conveyed the posters intent.

If one does not have room for guy wires for an 80' tower, I suspect one does not have room for an 80' tower. People/buildings/dogs etc should at all times reside well away from a tower's reach.

allan down under
A life lived in fear is a life half lived.
[ Parent ]



Re: Idea to reduce tower guy wire footprint (3.00 / 0) (#5)
by zinguvok (gmail.com is where zinguvok is at) on Sun May 11th, 2008 at 07:36:08 PM MST
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Very salient comment about fall zone. I would be inclined to use the space amongst the guy wires for farming or something similar which would not be seriously harmed were the tower/mill to fall on it. While it's unlikely that such an A-frame tower would fall towards one of its un-guyed sides, it is a serious matter.

Even in light of this consideration, though, A-frame towers would still be worth thinking about for sites where locating the side guys is unfeasible. Ridge tops come to mind, if they aren't too turbulent.

Does anyone actually know what kind of forces turbines of given sizes apply to their towers under given wind loads? This would be handy information to have...

[ Parent ]



Re: Idea to reduce tower guy wire footprint (3.00 / 0) (#7)
by Ungrounded Lightning Rod on Mon May 12th, 2008 at 08:50:51 PM MST
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A mill comes close to putting the same wind load on a tower as a solid wind-facing wall the size and shape of the swept area.

So treat it like a sign mounted on a tall pole or tower.  B-)

[ Parent ]



Re: Idea to reduce tower guy wire footprint (3.00 / 0) (#8)
by SparWeb (sparweb at ANTISPAM_hotmail_com) on Mon May 12th, 2008 at 09:16:54 PM MST
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...Plus a couple of other forces... gyroscopic forces... vibration...
Steven Fahey
[ Parent ]


Re: Idea to reduce tower guy wire footprint (3.00 / 0) (#6)
by mbeland on Sun May 11th, 2008 at 08:55:36 PM MST
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Hi Zinguvok,

Thanks for your reply. Yes the figure I posted was a face view. As you suggested, side view would be just like any tilt-up tower, guyed in both direction at the top and probably at two other points. So I thought no use to post that. Sorry if there was confusion in my post. I may have to guy the side of the A frame too...??

Must I understand that the towers that another poster sead were around for decades are totally freestanding? It is not what I wanted since I want something easy to access for maintenance and I don't want to have to climb although I think it might be fun the first time but not if I had to do it every year.

I understand 80 ft is high and I would have to make sure everything is calculated to withstand the loads. 80 ft is not totally set in stone yet. Our lot is 2 ha and is sloping towards incoming dominant winds. Trees are not as high as 60 ft yet but will be in a few years. I Just wanted to know if anyone had tried this. So, has any of you?

Martin
Eau, soleil, le vent
[ Parent ]



Idea to reduce tower guy wire footprint | 9 comments (9 topical, 0 editorial)

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