 Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me. |
Forum Index : Windmills : NON furling F&P
| Author | Message | ||||
KarlJ Guru  Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
Anthony and I have been going through some ideas for self speed control, got me to thinking.....SIMPLE Anyone got any thoughts on this theory. use 6 blades, thus rpm self limiting by blades running into each others wake at high speed, have relatively small diameter of just 1.2m, kind of like a rutland, and thus, will be all but indestructible as blades are short (PVC)with steel rod.. dont bother with any kind of furling, just keep into the wind with fixed tail. Disc for blade mount will be bolted or welded to the front of the shaft, which is cut down to as short as practical to use the f&P bearing mount.... Mount the whole thing on a small pole in the backyard and use any power generated to run a couple of outdoor 12V lights. While I'm at it, some of you talk about rewiring stators with "2 in hand" obviously this means 2 pieces of wire, I also note that the 100 series has a fair amount of spare space, perhaps enough for double the wire, anyone tried this? What I had in mind was wiring over the top of what is already there.... Also (cant find it now) someone talks about always re-wiring the stators as opposed to reconnecting them as it takes less time, I cant see the less time being a winner but interested in rewiring a 100S with the same number of turns in 1.0mm wire as the 80s has, I think it would fit. Luck favours the well prepared |
||||
| Janne Senior Member  Joined: 20/06/2008 Location: FinlandPosts: 121 |
The things you propose (slow small diameter prop, short pole) would also effectively make the machine useless. Only time it would be making good power would be in a gale, and even then it might broke, because there is nothing to restrict the stress in case of very high winds. If at first you don't succeed, try again. My projects |
||||
| JimBo911 Senior Member Joined: 26/03/2009 Location: United StatesPosts: 262 |
Karl You may want to check out imsmooth web site he has info on rewinding a 100 stator etc. http://www.mindchallenger.com/wind/ Jim |
||||
| neil0mac Senior Member Joined: 26/12/2009 Location: AustraliaPosts: 210 |
One ('good'?) theory deserves another ?? You are trying to accommodate wind speed (and the resulting RPM) in your theory. Right? Why not keep the optimum number of blades for peak performance and reduce the wind speed? Huh? What? How? Here is one suggestion - but it will dramatically increase the loading on the tower and supporting structure (guys, anchor points, etc. will need to be beefed up). In front of (or even behind?) the fan, have something that amounts to an adjustable louvre that can be mechanically opened and closed by means of a set of counterweights on the main shaft. As the fan speed increases, the weights close the louvre, and vice versa. An other is an opposing fan driven by (either the excess power above the 'maximumum) or a belt engaged by an idler pulley activated by a 'centrifuge'. A third way is to use some variation of 'reverse thrust'(jet plane style)? If any of these arrangements can be built (?) the strengthening of the remainder is simply an engineering problem that should be relatively easy to solve. |
||||
 Print this page |
 |
The Back Shed's forum code is written, and hosted, in Australia. | © JAQ Software 2025 |
