On Tue, 07 Nov 2006 10:35:15 -0500, daytripper
wrote:

On Tue, 7 Nov 2006 07:47:36 -0500, "Robert11" wrote:

Hello:

Was reading a book on ballistics the other day, and the author was
describing conditions
where a rifle barrel would drop a small amount as a shell was fired.

He used an example that if one held a fly rod rod truly horiz., and gave the
handle a very quick
upward (I think he means backwards; toward ones head) pure rotation, the tip
momentarily goes Downward.

Have my rods away for the season, so can't try it.

Can't visualize this happening.

Does it ?
Why does it, if so ?

B.


I can't see how any downward force vectors at the rod tip increase in this
scenario, so while he's correct that the rod tip will point below horizontal,
it doesn't "drop", it simply lags behind the rest of the rod movement,
establishing an arc...

I s'pose the same thing could happen with rifles, to some (hopefully
vanishingly small) degree...

/daytripper

I'd offer that it would be a bit difficult to hold the average fly rod
"truly horizontal"...unless one just had a lesson or two and the fly rod
in question was the all-new and improved O' Cedar Fishsweeper XLT1000,
for which the instructor was the sole local distributor...

OTOH, I'd offer that any rifle barrel that couldn't be held "truly
horizontal" might make a better fly rod than rifle barrel...

And finally, I'd observe that someone who suggests the physics/mechanics
involved in a rifle barrel at the moment of a round's discharge are
generally the same as someone lifting a fly rod would likely not know
much about either...but on the plus side, they'd be readily recognized
as an expert by some on ROFF...

HTH,
R