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Forum Index : Windmills : 30th Sept 07. New PVC blades.

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Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 4711
Posted: 01:38am 30 Sep 2007
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Hi All

For some time I've wanted to make a slow running high torque windmill. After reading the work of Dennis with his 5 blade 100 series stator windmill, I felt a slow running windmill would work better for my low wind location.

Part 1. A 6 blade turbine.

The blades were cut from 250mm PVC pipe. Each blade is about 1100mm long and has the leading and trailing edges shaped like a airfoil. Tip angle is about 5 degrees. Making PVC blades is fun, well not really, its dusty and the PVC dust has a static charge so sticks to everything, I looked like a snowman and had to vacuum myself!


I dropped the tower today and took off the 3 blade turbine based on those reshaped Chinese blades. They did work well, but I wanted more low wind power.


Up in the air and running. They work great, quiet ( I was worried about the noise, but this set is very quiet ), and start up in virtually no wind.


This is the mounting hub, all lasercut steel. Maybe a bit of overkill, but its strong, not that heavy, and I will never have to worry about it breaking.


Big improvement over the 3 blade turbine, same winds saw 4 to 6 amps, where I was getting 2 amps with the Chinese blades. The stator is a 80 series 7 phase 3 pole, startup is about 90RPM for 12 volts. Diameter is 2.66 meters, thats as big as my tower will take before the blades start clipping the guy wires.

Part 2. Dual stator.

Well this will be finished next weekend, so stay tuned. But here are a couple of photos. The nacelle is again laser cut steel, so it all fits together nicey. Uses one of Trevs re-splined shafts.




GlennEdited by Gizmo 2007-10-01
"If it dont fit, use a bigger hammer."

The Back Shed
JAQ Software
 
sPuDd

Senior Member

Joined: 10/07/2007
Location: Australia
Posts: 238
Posted: 12:30am 01 Oct 2007
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Glenn,

I like the look of that dual F&P. Any chance you
will be selling a kit of laser cut parts for it? One
of those 6 blade hubs would be sweet too


sPuDd..
It should work ...in theory
 
Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 4711
Posted: 08:24am 01 Oct 2007
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Yeah I am thinking of making up a little kit of laser cut parts. I used to have a "Kit" windmill I sold a couple of years ago, but they ended up costing me more to make than I was selling them for.

The PVC blade hub worked good. The only problem is the laser cuting of the spline to suit the F&P shaft. While the laser cut spline works fine, its not pretty, and I was always embarrased to sell them. Trev's cast aluminum hubs are a much nicer looking adapter. Maybe I can get Trev to supply a cast aluminium boss to suit the F&P spline, with a flat surface and bolt holes to suit my laser cut adapters for PVC blades ( or timber blades ).

Will look into it.

Tonight I'll draw up and post a diagram of how I cut and shaped the PVC blades. Its nothing new, but they are working good and others may find the info handy.

Glenn
"If it dont fit, use a bigger hammer."

The Back Shed
JAQ Software
 
brucedownunder2
Guru

Joined: 14/09/2005
Location: Australia
Posts: 1319
Posted: 08:37pm 01 Oct 2007
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Hi Glenn, as usual, nice work ,thanks for sharing it with us.

Have you used the "new" 3 phase stator and rotor ,recently ? ,and what are your thoughts - mind were that the output is a bit lower than the original F&P stator/rotor combination.

I've got a set of ABS plastic blades up and I was surprised at the early start-up in hardly no wind ,, without the rotor they would turn 24/7 , no doubt. But connecting the rotor and batteries holds the mill back considerably.
Visited Phil M yesterday and he is completing his dual stator rig using 4 halves of the 2 stators in star configuration running into a 48 v battery bank . I was surprised how easy we got the test rig spinning by hand and easily running up to 50+volts without very much "drag".

His abs blades are 1500 and mine are 1750mm .(radius).

all the best,

Bruce
Bushboy
 
domwild
Guru

Joined: 16/12/2005
Location: Australia
Posts: 842
Posted: 06:35am 02 Oct 2007
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Glenn,

Thanks for that. Nicely cut with the laser! How is the new business going?

Regards,

Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill
 
vasi

Guru

Joined: 23/03/2007
Location: Romania
Posts: 1697
Posted: 11:04am 03 Oct 2007
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Yes, this is The Way for low wind areas. Thank you Glenn! The detals are great.

This is better than Lenz turbine? I think is equal with Lenz in low winds but, better in higher winds?Edited by vasi 2007-10-04
 
dazz
Regular Member

Joined: 15/04/2008
Location:
Posts: 78
Posted: 03:13pm 25 May 2008
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Glenn, as a matter of interest. with those blades of yours, what would be the maximum RPM that you would be comfortable in them not falling apart, or doing other unfortunate things like folding?

Cheers, DarylEdited by dazz 2008-06-03
 
robbo

Regular Member

Joined: 25/03/2007
Location: Australia
Posts: 71
Posted: 01:13pm 16 Jun 2008
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Glenn,
Are you still considering making the kit for the dual stators ?
Havent seen any on your site.


"the Earth was not given to us, by our fathers, rather, it is lent to us by our children".
 
feix62k

Newbie

Joined: 30/07/2008
Location: Australia
Posts: 36
Posted: 11:39am 27 Aug 2008
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Hi I like the look of the six hub any chance of a drawing, how is the hub mounted on the shaft eg splined or welded back plate would ,love some dimentions hub diameter blade strenghtining brackets ect Ihave sucseesfully built my f and p moter know for the fun stuff I want to put it all together. I have 3 wires on moter can any one tell me were they go I used this config thanks Shane ps thanks all for a great site

dont the days seem lank and long when nothing gos right and everthing gos wrong
 
grolly

Regular Member

Joined: 19/05/2007
Location: Australia
Posts: 62
Posted: 08:44am 15 Sep 2008
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"Tonight I'll draw up and post a diagram of how I cut and shaped the PVC blades. Its nothing new, but they are working good and others may find the info handy."



Hi Glenn, did you get around to drawing how you cut and shaped the blades? if so where did you post it?

Grolly
I have bought the farm...now I AM powering it...
 
kgoering

Newbie

Joined: 27/11/2008
Location: United States
Posts: 1
Posted: 02:53pm 26 Nov 2008
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Glen
Very impressed with the design you came up with. Have been looking for a design for over a year and finally found yours. Most interested in the lasercut pieces that attach the blades to the hub. I have a solid hub that I would be able to attach these pieces to. Do you have drawings for these parts? Would you sell the dwg, or dfx files for them?
Thank you
Keith
Keith
 
wallablack

Senior Member

Joined: 10/08/2011
Location: Australia
Posts: 164
Posted: 06:39pm 04 Oct 2011
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  Gizmo said   Hi All

Uses one of Trevs re-splined shafts.

Glenn


Good Morning,

Does this Trev bloke sell/modify the original shafts? How can I contact him?
It is just what im looking for..

Kev.
 
BobMann

Senior Member

Joined: 30/06/2011
Location: United States
Posts: 134
Posted: 07:46pm 04 Oct 2011
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Hello I like the blades and hub good job.
Bob Mann
 
Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 4711
Posted: 10:10pm 04 Oct 2011
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Trev's stuff is at http://www.thebackshed.com/BasiclyNatural/ViewCat.asp?CL1=20 &CL2=56&CL3=NA

Glenn
"If it dont fit, use a bigger hammer."

The Back Shed
JAQ Software
 
itsandbits1
Regular Member

Joined: 13/08/2010
Location: Canada
Posts: 81
Posted: 12:26am 17 Oct 2011
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I've found the flexiness of the pvc to be an issue in gusts and with those two stators on one shaft, doubt you can lean the head back to give the blades some clearance. On a single side i've been able to keep them from whacking the pole and breaking by tipping the head back, same as any other .
 


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