In article , Ian D
writes
On Thu, 7 Apr 2005 06:38:29 +0100, "simon"
wrote:

How does one find / calculate the AFTMA number on a trout rod that is
notmarked with one?


Only practical way is to try a number of lines and find out which
weight suits both the rod, your own casting style and the intended
use.
AFTMA ratings for rods are purely arbitrary anyway, and are based on
the judgement of whoever tests out the prototype, so doing the above
could often be a good move even when you 'think' you know the AFTMA
rating.
I've often used rods where I've had to use lines up to +/- 2 AFTMA
sizes from that specified, to suit the occasion.

Cheers
Ian D

Good advice Ian, but I'd offer a word of caution to anyone having to
follow it. A line which is one or two # over that for which the line was
designed will usually fly out of the rings. I have had a rod break when
using a line only one # higher than the rod design. Rods will usually
take 1 # more than the rated #. but enthusiastic casting could prove
disastrous :-).
--
Bill Grey
http://www.billboy.co.uk