Absolutely.
But the 1/2 wind speed at ground level is added to our safe speed only to
allow for wind gradient near ground level.
Nothing to do with wind sheer. Have a look at your BGK, page 70.
Wind sheer can occur at any altitude from any direction - it has no
correlation with wind speed or direction at ground level.
You could get wind sheer somewhere on circuit when the ground wind was
zero - early in the morning before the lower air mass has coupled with the
higher air mass for example - so adding half of zero doesn't help you much
then.
The safe speed (1.5 x Vs) should provide adequate margin for gusts,
thermals, wind sheer, etc.
cheers
David
>-----Original Message-----
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED]]On Behalf Of Peter
>Rundle
>Sent: Tuesday, 11 September 2001 10:39 AM
>To: [EMAIL PROTECTED]
>Subject: Re: [aus-soaring] Downwind leg airspeed
>
>
>> Wind gradient occurs due to wind friction with the ground.
>
>And what about wind sheer? Wind gradient and wind sheer are not one
>and the same thing!
>
>
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