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Forum Index : Windmills : Storm Damage: Windmill Down
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fillm Guru  Joined: 10/02/2007 Location: AustraliaPosts: 730 |
There is a lot more to wind turbines than stick it up in the wind on a stick, thats where it just starts , Ive killed about 5 and I am still learning. PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
There _is_ another way to increase the guy wire angles without changing the mast or anchor locations. I'm sure you are familiar with or have observed yacht masts. These have a very narrow guy (stays) anchor base as its limited by the beam of the vessel. They get around the angle problem by using spreaders. Now, you too could use spreaders on top of the tank, protruding horizontally outwards from the mast base beyond the rim of the tank. You run the guy rope down from the top mast anchor point and out over the end of the spreader bar, hence back in to your anchors at the tank base. You could easily get 45 degree angles without having overlong spreader bars. The important thing is the angle the guy rope makes over the end of the spreader bar, it should be the same angle above and below the bar end. Just draw a scale sketch of your tank & mast height then experiment on paper what the best spreader length would be. If your tank top is high enough off the ground the spreaders would not get in the way of everything and you could fit stout white irrigation conduit over the lower guys to make them visible. Klaus |
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KarlJ Guru Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
mine lifted perhaps 150kgs up vertically 3" when a welded cuff broke. It needed to lift it off the bottom section of pipe. conclusion : loads enormous! Luck favours the well prepared |
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yahoo2 Guru Joined: 05/04/2011 Location: AustraliaPosts: 1166 |
Karl, your pole basically walked its way up the flange, all it takes is a steady wind to give the top edge of the pipe good contact and some movement from side to side and it will work its way off in a few minutes. Happens a lot with flagpoles and goalposts. I'm confused, no wait... maybe I'm not... |
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MacGyver Guru Joined: 12/05/2009 Location: United StatesPosts: 1329 |
Crew I've looked at this thing (wind turbines) six ways from Sunday and have finally determined what I will do from here on out. Being the recipient of TONS OF WIND DAMAGE from a tornado hit on December 19th, it occures to me the LESS stuff I have flying around up on the pole, the better. For this reason alone, even though those of you who know I've made the statement in the past that I would never, never, never again build a VAWT, I'm here to tell everyone, from here in, a VAWT is the ONLY thing I'm going to buiild. The reasons are simple: First off, it is less stuff high atop a tower to blow down and kill you or mash everything you own. Secondly, I"ve come up with a design that ACTUALLY WORKS! Imagine that! I'm in the process of rebuilding after the tornado whistled through last month. I'm constructing a type one, steel-reinforced-concrete "bunker" for lack of a better description in which I can live wind-damage-free for the rest of the adventure (I sustained over $20K damage). I will be building several VAWTs of my new design. The new design is merely a flat, thin, rectangular blade manufactured from anything from aluminum sheet to plastic to plywood -- encircled by a "cage" of wind vanes all pointing inward in one direction. All it does is capture wind from any direction and force it into a "vortex" at the center, then it exhausts out the top and sides. The trick here is, the blade can be 4 feet tall and 20 feet long if you wish. Size is no longer much of an obstacle. I'm banking on torque and a transmission in place of lots of high-stress parts whirring at tree top. I'll, of course, post the build as it happens. Maybe I should slap together a smaller(ish) one to show proof of concept (although I've successfully built this design back in the day) so everyone can reconsider things. If for no other reason than to avoid "yaw" forces, a VAWT makes sense. The only thing is, up to now, they just don't seem to work all that well. I think I've conquered that. . . . . . Mac Nothing difficult is ever easy! Perhaps better stated in the words of Morgan Freeman, "Where there is no struggle, there is no progress!" Copeville, Texas |
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