On Wed, Jan 26, 2011 at 11:56 PM, Carl Denk <cdenk@windstream.net> wrote:
>
>
> On 1/26/2011 6:39 PM, RussellMc wrote:
>>> Actually, planes with wings with aerodynamic profiles are pulled up by =
vacuum
>>> (in a way to speak), more than pushing air down.
>>>
>> Planes with wings *without* aerodynamic profiles would be interesting
>> to see :-).
>>
>>
> More typically aerobatic (planes designed to do stunts including flying
> upside down) have symmetric wings, with same top and bottom profiles.
> The difference of length of the top and bottom =A0surfaces is created whe=
n
> the wing impact point on the leading edge is moved down by increasing
> the angle off attack (move the front up relative to the trailing edge).

Aerodynamic and symmetric aren't mutually exclusive.

Chris

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