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Forum Index : Windmills : Eco Innovation Blades your thoughts

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darcyrandall200

Newbie

Joined: 17/01/2009
Location: Australia
Posts: 34

Posted: 06:29am 27 Feb 2009

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Hello,

Recently I mounted a set of six, black plastic, 1.5m diameter blades from Eco Innovation upon my F&P wind turbine.

My F&P wind turbine is wired 7p6p, suitable for a 48V system.

After mounting the Eco Innovation blades I am under the impression that the blades will allow me to produce alot of power during gale force winds, yet for general day to day operation I am better off using perhaps those cheap modified chinese blades to produce usable power in less wind.

Do others on this forum agree with this belief?

As I havnt yet completed a successful F&P turbine, I dont know what sort of power output I can expect given certain wind conditions and blade setups. To date I havnt been very impressed with the power output of my turbine. I am unsure as to whether there is too much friction in my setup, my blades are inadequate or my expectations are too high. I was hoping to achieve 300rpm, 100Watt output in 8Knott winds.

Cheers

Thankyou.

Regards Darcy Randall, Perth Western Australia

GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 08:31am 27 Feb 2009

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I hope you are aware that the wind energy in approx 4m/s with a 1.5m dia rotor is approx 210W. The blades might be 25% efficient and the alternator might be 70% efficient. allow some more losses for rectifiers and the battery, inverter, and this does not come anywhere near 100W available to power loads. [closer to only 25W]

I doubt chinese blades will give much more power, unless the rotors dia is a whole lot bigger, approx 4x the rotor area would give you the 100W. This would be a 3m dia rotor. The problems this gives is that the alternator will then be probably incorrectly sized. Furling will need to be revised and the list goes on.

Gordon.

become more energy aware

Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 5119

Posted: 08:42am 27 Feb 2009

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Hi Darcy

I tried those blades about 5 years ago, and I had the same results as you I'm afraid. Very poor performance on the F&P in normal wind conditions. They are ok if you get gale force winds

The chinese blades will work better, they have a diameter of about 2.2 meters.

The best oprions are either hand made PVC or timber blades, or a set of Trevors 2.5m diameter hollow fibreglass blades. I've run Trev's blades on a 7p2p stator into 12 volts, and have seen 340 watts.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

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