On Nov 10, 12:53*pm, riverman wrote:
On Nov 10, 7:22*pm, wrote:

Some considerations on casting and rod loading.

A simple calculation for casting in air is;

Frt = Fi * Fa * Ff * Flt

Where Frt = the force on the rod tip in kg.m/s², Fi = inertia (mass)
in grams, Ff = the coefficient of fluid kinetic friction µk ( air
resistance), Fa = the acceleration of the line in ms², and Flt = line
tension in kg.m/s²

You might want to check your units, Mike. I get Frt would be in
Kg*g*m^2

If you mean acceleration of the line is in m/s^2, then the units of
Frt would be even worse: Kg*g*m^2/s^4

I think you need another factor in there...but Physics isn't my strong
suit.

--riverman
(unit analysis r us)

There are several other factors, but for the purposes of demonstration
they can safely be ignored.

QUOTE
In physics String Tension is the magnitude of the pulling force
exerted by a string, cable, chain, or similar object on another
object. Tension is measured Newtons (kgm/s2) and is always parallel to
the string on which it applies. There are two basic possibilities for
systems of objects held by strings.[1] Either acceleration is zero and
the system is therefore in equilibrium or there is acceleration and
therefore a net force is present. Note that a string is assumed to
have negligible mass.
UNQUOTE

http://en.wikipedia.org/wiki/Tension_(physics)

TL
MC