Posted for Chris Zavatson <chris_zavatson@yahoo.com>:


Angle of attack can have a few different definitions. If tied to airframe
or airfoil geometry then zero degrees can produce positive lift. To keep the
math simple, the zero lift line is used. By definition, when it is at zero
angle there is zero lift. Any positive angle produces positive lift. This
removes all the variables of the physical geometry such as washout and
incidence angles, etc.
Down low and fast the 360 needs a lift coefficient of about 0.19 or about
1.9 degrees - referenced to the zero lift line.

Chris Zavatson
N91CZ
360std
http://www.n91cz.net/

>
>
> On Friday, February 7, 2014 8:59 AM, Douglas Brunner
><douglasbrunner@earthlink.net> wrote:
>
> Question for all the aerodynamicists out there.
>
> If a plane is flying, its wing must be generating lift. Does a wing
>generate lift at a zero degree angle of attack?
>
> I thought that there must be some positive angle of attack in level flight.
> Am I wrong about this?
>
> And if I am right, shouldn't the angle of attack be set to some small
>positive number?
>
> -----Original Message-----
>>From: Sky2high@aol.com
>>Sent: Feb 7, 2014 9:46 AM
>>To: lml@lancaironline.net
>>Subject: [LML] Re: Angle of attack
>>
>>
>>Tom,
>>
>>Interesting. The wing has wash out so different parts of the wing are
> at slightly different AOAs (think propagation of stall). The design has
> the longeron at zero degrees at cruise, flaps at reflex (think chord line
>from
> leading edge to flap TE). Even average angle of incidence doesn't work
> because of wing/flap design. Why not use zero, 1 or 2?
>>
>>Scott krueger
>>
>>In a message dated 2/7/2014 8:16:45 A.M. Central Standard Time,
> n20087@yahoo.com writes:
>>>  Folks
>>>
>>>I am about to setup a g3x in my 360. I was wondering if
>  anybody could tell me what the typical cruise angle of attack might
>  be
>>>
>>>Thanks
>>>
>>>Tom
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