Re: MythBusters airplane on a conveyor belt

Dudley Henriques <dhenriques@xxxxxxx> wrote in
news:j_udnZk_nKAdfDzanZ2dnUVZ_jmdnZ2d@xxxxxxx:

Bertie the Bunyip wrote:
Dudley Henriques <dhenriques@xxxxxxx> wrote in
news:f92dnRyOhrIBSTzanZ2dnUVZ_qHinZ2d@xxxxxxx:

Bertie the Bunyip wrote:
Dudley Henriques <dhenriques@xxxxxxx> wrote in
news:VqidnXH7PqDWUTzanZ2dnUVZ_uCinZ2d@xxxxxxx:

Bertie the Bunyip wrote:
WingFlaps <Moreflaps@xxxxxxxxx> wrote in
news:ddef2011-7cca-4e5e-b5a8-
9019a362b263@xxxxxxxxxxxxxxxxxxxxxxxxxxx:

On Jan 31, 12:34 pm, "Robert M. Gary" <N70...@xxxxxxxxx> wrote:
On Jan 30, 1:36 pm, Peter Clark

<Inval...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
For those interested in such things, the MythBusters show
titled
"Airplane on a Conveyor Belt" is in TVGuide to air tonight at
9pm
Eastern US on Discovery/Discovery HD.
Yea, I had the TiVo searching for it for the last few weeks. I
see
that its set to record soon (I never actually pay attention to
when
a show is on anymore). I'm looking forward to it. To me the
interesting part will not be the experiment but the premise. Do
some believe that an airplane generates lift as a result of the
speed of the wheels? -Robert
I'd be interested in knowing whether they can detect the actual
lift
derived from the wheels spinning as the plane lifts off...

Well, you could do it in a wind tunnel!
There was a time in the 30's when a rotating cylinder was seen as
the
future of the wing. I think maybe even a few were built! I'm
pretty
sure I have an old Popular aviation with a few pics of a fairly
unsucessful prototype..
But a little spinning wheel isn't going to give you much..

Bertie
Actually you can still do it.

Really? I thought there might have been a physics watershed back
there
in the late ffties! ;)
We could check this out with Ken, but I'm pretty sure it will work
without him :-)))

I used a spinning cylinder all the time
in my discussions on aerodynamics. It makes a perfect example when
getting into lift. A cylinder not rotating in a free stream
airflow
has no lift as the stagnation points are neutral. The airstream
flows
over the cylinder equally; no Bernoulli...no Newton.
Now spin the cylinder clockwise to the airstream.
Walla......instant
lift! You get it all in one simple demonstration. You get upwash
and
downwash. That's circulation. (Newton) You get increased local
velocity over the top of the cylinder and decreased local velocity
under it. That's Bernoulli!
The whole shegang is Magnus effect. It's a wonderful way to get
into
wings, golf balls, curve balls...the whole magilla :-))

Excellent. What kind of contraption do you use to demonstrate?

Bertie

Just a tin can, a blackboard and chalk, some finger pointing and a
good
gift of gab :-))


OK> You don't actually spin the can in front of a fan or anything
then?
I have located a very olp plan for a rubber powered cylindrical wing
model if anyone want me to post it I will.

Bertie

The Naval Test Pilot School used to have a neat demonstration film set
up with a smoke generator and a fan coupled with a cylinder that was
both static and synamically capable that was shot in Schlieren format
that did the trick nicely, but in a pinch, I always found the
blackboard
and chalk thing did just as well.
The trick with audio visuals is that the emphasis is really on the
instructor and how he/she uses the training aid rather than the
training
aid itself. It's amazing what you can get across to people with the
right gift of gab :-))


I usually resort to drawing on the back of beer mats, myself.


Bertie
.

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