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Re: Archie a non-flyer? (was:Re: origin of bats/reply 2 to TMK)
On Thu, Jun 26, 2008 at 7:29 AM, jrc <firstname.lastname@example.org> wrote:
>> One will have problem if do not restrict flow direction in the
>> analysis - specially if consider a flow parallell to gravity
> One will have a problem if they do restrict flow direction. With that
> restriction, you are no longer modeling what's happening to the airfoil.
Nope, since one will analyse lift here. Deviation from horizontal flow
must be translated into more or less lift - or differential pressure
over the wing faces.
>> But so let's go put Bernouilli effect in a zero-cambered wing. We will
>> regard two situations: I) positive angle of attack and II) negative
>> angle of attack. Where the air is accelerated in (I), and where the
>> air is accelerated in (II)?
> For a non-cambered wing at positive angle of attack, the leading stagnation
> line shifts away from the leading edge to a line on the lower surface near
> the leading edge, and the flow above that line reverses, accelerates
> forward, around the leading edge, and aft over the top of the wing at high
Why the air above the stagnation line will accelerate in (I)? And the
air bellow stagnation line will accelarate in (II)?