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Forum Index : Windmills : Windmill documentation project
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Hi everyone. I want to add more infomation to the web site, in particular formula used for calculations in all the little areas that make up a windmill. eg... Blades, TSR, angles at stations, chord, etc. Tails, offset, pivot angle, weight, furling, etc. Masts, guy wire locations, gin pole lengths, etc. Electrical, ohms laws, watts and watt hours, etc. Etc, etc, etc. I want the page to have every formular we could want to use for our windmills. So if I wanted my windmill to furl at a certain speed, or I wanted to know how many volts I was loosing along my 100 meter power cable, I could use this site as a reference to find the answers. Now I know the maths for blades and their design, and electronic theory, but I'm a little short on knowledge about towers, furling, wind power/density, etc. Some info on materials could be handy too, like the best timber to make blades out of, and why, guy wire sizes and breaking strains, etc. There's a lot of info to gather, and I know some of it has already been covered on this forum. So if you know some calculation or tid-bits of info that may be useful, post it here and I'll add it to the web page. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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makourain Senior Member  Joined: 19/04/2006 Location: Posts: 111 |
this is a good one for tail furling (thanks kurt) http://www.windstuffnow.com/main/turbine_kit.htm something that i know would be useful is maybe a glossary of the terms that are used. for example on that link its got all these different words and formulas that could be hard to understand for those not mathematically inclined. |
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Bernie the Bolt Regular Member  Joined: 26/10/2006 Location: United KingdomPosts: 45 |
Hi Gizmo, Great idea, sounds very usefull to anyone like me about to build first genny. Hugh Piggotts book "Windpower workshop" covers a lot of the stuff you are after, I quess the equations like wind speed/power available etc., would be in public domain & not copyright ? Best check with him. I would also like to see links to suppliers of charge controllers, desulphators, bridge rectifiers etc. and circuit diagrans/parts lists for those whishing to build themselves. Bernie the Bolt I'd rather be sailing! |
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| Gizmo Admin Group Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Good idea's, keep them coming. I'll contact Ed and Hugh to see if they mind me using their formulars. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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vawtman Senior Member Joined: 14/09/2006 Location: United StatesPosts: 146 |
Gizmo i may be of some help in the future.I just cant follow the golden rules at this time. I think Ed(windstuff) has the best program with formulas youll find anywhere. Im sure he wouldnt mind. GREAT GUY. 
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windstuffnow Newbie  Joined: 30/06/2006 Location: United StatesPosts: 31 |
Hi Glenn, I don't mind you can use what ever I have posted on my site. I may be able to help with some other things as well... maybe post a list of demands I'll add what ever I can... Have Fun! Sounds like a book is about to be written. Windstuff Ed |
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| Gizmo Admin Group Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Thanks for that Ed, appreciated. Question for you guys. Wire resistance. I'm working on a page to calculate the voltage drop across the power feed wire from tower to battery bank, and I'm including the AWG/mm diameter wire charts, but every chart I've found on the internet seams to have different values for resistance/wide diameter. Would anyone know of a accurate reference for resistance/diameter for a copper wire? The wire chart I have has values in AWG, mm and inches. Speaking of inches, I'll also have a conversion page from imperial to metric and back, handy for our American friends. I was lucky in that I started my schooling when Australia changed from imperial to metric, so I have a understanding of both systems. I was in the USA last year for a CAD conference, and it was handy to know the imperial system on a few occasions. I was asked how thick we could cut with out profile cutter and I said 200mm, and got some blank looks  , then I said 8 inches and everyone knew what I was talking about. The workmate who went over with me ( he's only about 25 ) didn't have a clue, he's only ever know metric. I did have problems with the temperature C to F conversions. I would say water freezes at 0C and boils at 100C, but this didn't seam to help.
Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| thefinis Regular Member Joined: 23/08/2006 Location: United StatesPosts: 53 |
Several charts for varying wire size and loads. http://www.windsun.com/Hardware/Wire_Table.htm This has a handy calc at bottom of page for losses on wire runs http://www.powerstream.com/Wire_Size.htm Sorry guys but much of it is in imperial Finis Texas born and bred |
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Prof Newbie Joined: 01/12/2005 Location: AustraliaPosts: 33 |
Hi Gizmo, To answer your question with a question, how much copper is in your copper wire?? What comes from each producer would vary in its quality. Never the less, when I worked for an old Australian business we used the attached data. Again its not metric. Prof 2006-12-02_232542_Annealed_copper_wire_Binder1.rar I know boats!! |
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