Re: [Phys-L] BP or CE?

["Anthony Lapinski" <Anthony_Lapinski@pds.org>]

Thanks! Interesting video. Nice demos illustrated!

So now I wonder:
How do certain planes fly upside-down?
Are their wings shaped differently?


Phys-L@Phys-L.org writes:
> I inserted a pointer below.
>
> Brian W
>
> On 12/23/2014 5:34 AM, Anthony Lapinski wrote:
> > perfume atomizer
> > blow between two hanging cans
> > > Venturi / Bernoulli
> > > > spin on baseball pitch
> > > > dimples on golf ball
> > > > Wiffle ball
> > > Magnus effect (with enhanced boundary layer activation for the golf
> ball.)
> > > > shape of plane wing
> > > > blow over paper
> > > > boomerang
> > > Coanda /Bernoulli.
> > > > vacuum cleaner and beach ball
> > > > toy blow ball pipe
> > > > vertical Dyson fan and balloon
> > > > air blower and toilet paper roll
> > > Unsure of configuration details: vacuum blowing down on beach ball to
> > > lift it, or blowing up to suspend it?? etc...
> > 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.