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super windy
Junior Member
195 Posts |
 Posted - 24/04/2008 : 22:01:46
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hI GUYS WHILE SURFING YOU TUBE I CAMME ACROSS THIS VIDEO:
http://www.youtube.com/watch?v=BawUfbDDvtA
hOWEVER THOSE BLADES WOULD FLEX SO MUCH THAT YOUR TOWER WOULD HAVE TO BE AT LEAST 300MM FROM THEM, I PERSONALLY WOULDN'T RECOMMEND USING HIS FORMULA, HOWEVER I COULD BE WRONG, I JUST SEE IT AT 1METRE LONG, THEY ARE WAY TO FLIMSY, AND WRONG, YOUR OPINIONS PLEASE, GHURD SORRY BUDDY, i GUESS IT'S JUST ANOTHER YOU TUBE VIDEO FOR YOU , BUT DO LET US KNOW WHAT YOU THINK.
CHEERIO
SUPER WINDY
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ghurd
Junior Member
USA
274 Posts |
Posted - 25/04/2008 : 01:14:55
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A blade guy I ain't.
I know what I do, how I do it, and why it works or why it doesn't. Usually. Sometimes.
The video. Sorry. Un-Good. IMHO.
Not that I would watch it.
Seems more related to flat plywood blades.
No mention of lift or anything. No mention of power removed from the air.
Seems closer to how a screw drives itself into a plank.
PVC blades are crazy to figure out. I don't try anymore.
There is a lift factor and a drag factor.
They are better than they should be, but the math does not back up the good parts.
IE: How long is a liter? How heavy is a meter? What size tires does my wife's car use?
Ever see a PVC blade that'll do a loaded or design 8 TSR? Nope. Too fast for PVC.
The TSR of 8 pretty much had me spitting lager out my nose. Pillsnar? OK, plain-old USA Beer.
I can't reconcile some of the video numbers.
I had to mute the sound, and I'm a hillbilly!
Barefoot, as I type, just was outside barefoot with the broken dawg for half an hour, and I expect I'll eat something I killed myself (probably with a Ruger Blackhawk .44 mag handgun) tonight. Just pointing out there is no hillbilly prejedice.
So I could have missed something.
Then there is the whole PVC blades bending under force and output thing.
All that fancy math goes out the window. I can hear when mine start to bend, and they ain't that big or that skinny!
I would love to see the video of those blades reaching 500W output. The video.
I expect any normal windmill would have the blades bent back and reversed to completely stalled, or broken from impact with the tower before the wind was very powerful. (trust me on that one)
I wouldn't want to be there in person.
I wouldn't want my 2-shot/day diabetic, broken back, dog within 500 yards of it.
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Capt Slog
Starting Member
United Kingdom
29 Posts |
Posted - 25/04/2008 : 09:20:16
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| Those blades look very strange. What is the purpose of the bit at the root? It points back so far that it is facing the wrong way and doesn't look as if it contributes anything other than drag. |
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VIDEO OF PVC BLADES LAYOUT/NOT SURE
