"Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote in message
news:LbydnT9K86ux5w3ZnZ2dnUVZ_tOdnZ2d@wideopenwest .com...
"Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote in message
news:HvednScQQ67J5A3ZnZ2dnUVZ_oGdnZ2d@wideopenwest .com...


"Peter Dohm" wrote in message
news

"Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote in
message
...

http://www.fi.edu/wright/again/wings...r/golf-01.html
description and a drawing...

...
So all of the articles agree on a couple of points, and appear to have
obtained the same photo for publication. However the Magnus Effect,
while
well known to be true to every golfer (usually in a detrimental way)
appears
to be backward in some sense.

For the moment, this appears to have moved from my Solved Problems List
to
my Unsolved Problems List.

Peter

Dunno, looked OK to me. If the ball is flying across your screen from
right to left think of an airfoil moving from right to left, low
pressure
on top, circulation has to be clockwise in this view to accelrate the
flow
across the top and decelerate it around the bottom -

"1877, British scientist P.G. Tait learned that a ball, driven with a
spin
about a horizontal axis with the top of the ball coming toward the
golfer
produces a lifting force. This type of spin is know as a backspin."

That would be clockwise in a view where the ball is moving from right to
left...

Note: Have you ever seen a drawing or wind tunnel picture where the
object
was traveling from left to right or the air was moving from right to
left?
How did we become so consistant?



oops, didn't read far enough:

"The dimples also help in the generation of lift. By keeping the flow
attached, the dimples help promote an asymmetry of the flow in the wake.
This asymmetry can be seen in Figure 5. In this figure, the smoke shows
the
flow pattern about a spinning golf ball. The flow is moving from left to
right and the ball is spinning in the counter-clockwise direction. The
wake
is being deflected downwards. This downward deflection of the wake implies
that a lifting force is being applied to the golf ball."

This is inconsistant with my thinking and inconsistant with the top of the
ball moving towards the golfer as described earlier on the page...

--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.


I thought that I would be able to find a web site with the wind tunnel video
that I'm sure I've seen of this; however, for this evening at least, I must
admit that I have indeed struck out.

This is a subject that I would really like to understand; although I would
settle for a couple of good practical rules of thumb. If I happen to find
anything, I'll be sure to post it--or a link as appropriate.

Peter