Re: [Phys-L] BP or CE?

[brian whatcott <betwys1@sbcglobal.net>]

Planes with flat lower surface wings fly inverted with high drag and low 
lift, so you see an exaggerated angle of attack and high power setting, 
when they fly inverted, straight and level. Other aircraft use 
symmetrical wing sections for better inverted performance.

Brian Whatcott    Altus OK


On 12/23/2014 10:10 AM, Anthony Lapinski wrote:
> Thanks! Interesting video. Nice demos illustrated!
>
> So now I wonder:
> How do certain planes fly upside-down?
> Are their wings shaped differently?
>
> > > Vacuum/fan blowing up on ball/balloon to suspend it.
> > Coanda/Bernoulli as described here:
> > http://tinyurl.com/kpergs4
> > or
> > https://www.youtube.com/watch?v=6Q8HssqWDDE&list=PLLKB_7Zd6leNJmORn6HHcF78o2ucquf0U&index=1
> >
> > at 2min:50 sec. on...
> > > > > > > What demos illustrate each?
> > > > J Denker replied:
> > > > > > Reasonable Bernoulli examples include:
> > > > > >     -- ordinary airfoils.
> > > > > >     -- Pitot-static system.
> > > > > >     -- Magnus effect (spinning cylinder + true airspeed).
> > > > > >     -- Venturi geometry (probably).
> > > > > >     -- levitating disk, as previously discussed.	
> > > > However, he seems to have lost a desired negation, in the paragraph
> > below:
> > > > > > In contrast, if it looks like a narrow high-velocity jet impinging
> > > > > > on a curved surface, it's probably Coanda.  If the same jet
> > > > > > impinging on a flat surface doesn't produce the effect, it's a
> > > > > > dead giveaway that Coanda is involved.
>
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