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Non-Tech : Alternative energy -- Ignore unavailable to you. Want to Upgrade?

To: atticus4paws who wrote (6476)	5/9/2009 7:22:01 PM
From: gg cox	Respond to of 16955

I was referring to the math in the Vet's whole post. Message 25632825 daviddarling.info reuk.co.uk

To: atticus4paws who wrote (6476)	5/9/2009 8:41:21 PM
From: The Vet	Respond to of 16955

The speeds mentioned in your reference were wind speeds, nothing to do with rotor speed. William, obviously smaller turbines operate at higher rpm but the limiting factor is the tip speed ratio for all of them. For current modern designs that gets up to around 7 so that means that in a 30 mph wind the tips are travelling at 210 mph still rather too fast for a unsuspecting bird in flight to avoid. reuk.co.uk "Highly efficient aerofoil rotor blade design can increase these optimum values by as much as 25-30% increasing the speed at which the rotor turns and therefore generating more power. A well designed typical three-bladed rotor would have a tip speed ratio of around 6 to 7."