 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 : Big fan/turbine
| Author | Message | ||||
| Joblow Regular Member  Joined: 05/01/2010 Location: AustraliaPosts: 54 |
I have a used, fibre glas or carbon fibre five element cooling tower fan which may be utilised in my proposed mill if your criticisms (good or bad) don't make me reconsider. it is 2.2 metrea diameter, the blade cross section is shaped similar to airplane propelors, the blades are 950mm long, 450mm wide at the widest part and 420mm wide at the narrowest, the central boss is 425mm diameter with a 40mm bore, the boss is made in two halves bolted together so that the blade angle? can be altered by loosening the bolts. I tried to upload pictures but haven't been able to work out how to do it yet. Any input will be gratefully received. The man who never made a mistake never made anything |
||||
| Robb Senior Member  Joined: 01/08/2007 Location: AustraliaPosts: 221 |
You did upload the picture ok. You didn't included it in your post. 
There it is  .
 <--- Use that one to upload to your "picture library". (You did that ok).
 <--- Use that one to put the image in your post or........
|
||||
| Robb Senior Member Joined: 01/08/2007 Location: AustraliaPosts: 221 |
Do it like this BUT with forum codes enabled [img] http://www.thebackshed.com/windmill/forum1/uploads/Joblow/20 10-01-06_172120_DSCN0399.jpg[/img] So you start with [img] enter the picture url here and finish with [/img] |
||||
| Joblow Regular Member Joined: 05/01/2010 Location: AustraliaPosts: 54 |
Thanks for the info Robb, I'll get better as time goes on  The man who never made a mistake never made anything |
||||
KarlJ Guru  Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
whoa.... chord is VERY wide making an inefficient design. dont dispair.... i would start by finding out if you can bolt it to the generator (f&P whatever else) with some ease 2m is a good size for an F&P hobby mill Break out the angle grinder, Mark lines ~160mm from the leading and trailing edges at the tips giving you a tip of approx 100mm wide in the middle of the blade section (the strongest part) or some variation of that theory, eg sweeping forward or back for visual appeal. Similarly at the root of the blade mark a line ~140mm from the leading and trailing edges. Join the marks from root to tip, everything outside the lines cut off with an angle grinder, then mark a line 20-30% back from the Leading edge, this will be the thickest part of the aerofoil and re-profile the blades back to something that resembles and aerofoil. All that work and you could have PVC or Aluminium blades for $40-55 /m which do work... Phill chime in if you like -he has some blades on similar hub that he made from plastic pipe, lots of time and dont work very well. Good luck Luck favours the well prepared |
||||
| Joblow Regular Member Joined: 05/01/2010 Location: AustraliaPosts: 54 |
Sounds like good advice KarlJ, no problem mounting it but cutting it up may be a problem as the blade section is hollow, so where would I get the best blades from at a good price  The man who never made a mistake never made anything |
||||
| KarlJ Guru Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
On one of the tabs on the homepage "kits and parts" PVC and Aluminium Blades Luck favours the well prepared |
||||
 Print this page |
 |
The Back Shed's forum code is written, and hosted, in Australia. | © JAQ Software 2025 |
