Re: ots of responses, one email, easy deleting, low in calories

["julian ginniver" <julian.ginniver@lineone.net>]

John,

    having re-read the original article I think you are

probably right.   However the original message was a direct quote from the

article which was open to interpretation.  I have to admit that when I read

it originally I

assumed that they were talking  40-50% of the "theoretical maximum of the

aerodynamic efficiency".  Rather than 40-50% of the 59.3% i.e.  23.7 - 29.7%

of the "theoretical maximum of the aerodynamic efficiency".



Thanks very much for correcting me on this.



Regards

        Julian

----- Original Message -----

From: "john grant" <grantjoh@pacbell.net>

To: "julian ginniver" <julian.ginniver@lineone.net>

Sent: Friday, November 23, 2001 4:43 PM

Subject: Re: ots of responses, one email, easy deleting, low in calories





>

>

> julian ginniver wrote:

>

> > The theoretical maximum of the aerodynamic efficiency of a wind turbine,

> > known as the Betz limit, is 59.3%.  In practice, modern wind turbines

can

> > achieve efficiencies of between 40-50% (source UK Department of Trade

and

> > Industry).

>

> I have heard that when efficiency numbers are given, such as 40-50%, they

are

> talking  about 40-50% of the Betz limit of 59.3%.

>

> John Grant

>

>







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