The Green killer: Scores of protected golden eagles dying after colliding with wind turbines.

California's attempts to switch to green energy have inadvertently put the survival of the state’s golden eagles at risk.

Scores of the protected birds have been dying each year after colliding with the blades of about 5,000 wind turbines.

Now the drive for renewable power sources, such as wind and the sun, being promoted by President Obama and state Governor Jerry Brown has raised fears that the number of newborn golden eagles may not be able to keep pace with the number of turbine fatalities.

Concerns growing in Australia following this path as Australia stand to lose thousands of native birds.

Golden Eagles , not Green Eagles


So The Golden Killer


or are you hard righters obsessing on the Greens political party AGAIN !

I can only go on the local coal power station . When the filters on , there is nothing much wrong with it .

Before , just at dusk , the 'flilters' used to be turned off . The smoke looked so heavy , you could walk on it . The filters cost money to operate , and it was a Labor government that turned the filters off on dark .

____ wrote on Mar 5^th, 2012 at 8:23am:


Bob Brown, the Greens killer!

Some environmentalist!

BlOoDy RiPpEr wrote on Mar 5^th, 2012 at 7:51am:


It's horrific. We have an alleged green person in hear banging on about animal cruelty in Indonesia yet is prepared to see the slaughter of thousands of birds. What a phuking hypocrite.

Quote:


440,000 birds killed. That's 440,000 reasons to call greens hypocrite.

Baronvonrort wrote on Mar 5^th, 2012 at 1:11pm:


Do you need pics?

Think that it couldn't happen?

olde.sault wrote on Mar 5^th, 2012 at 2:37pm:


I counted 6 dead birds on the road yesterday yet nobody is calling for us to go back to the horse and buggy.
Cars kill lots of birds yet nobody calls for cars to be banned.

I think a bird or 2 could get killed by windturbines yet why are there no photos of piles of dead birds at the base of a wind turbine?

The tip speed is the limiting factor for a propellor if it goes supersonic it does not work,tip speeds have to be well below supersonic which is around 344 m/s.
A large diameter turbine will have to spin much slower than a small one.

The leading edge is a parabola it is not sharp or it would lose efficiency.

When we look at the data from a 1 MW turbine they rate  it between 8-26 revolutions per minute the tip speed is the limiting factor.

Data source 1 MW turbine-http://www.winwind.com/offering/1-mw/#detailed-data

A 3MW Turbine spins at 5-18 revolutions per minute.

I feel i will be waiting forever for someone to post a pic of a pile of dead birds right under a wind turbine.

freediver wrote on Mar 5^th, 2012 at 6:50pm:


I have seen 3MW turbines in action they would be flat out at 16 rpm.

At night it might be difficult for some birds yet bats are about the only things we see in the city.

There are reports of bats flying into parked F117 stealth fighters at night and killing themselves.
That sort of thing increases a pilots confidence in the stealth ability of that aircraft.