My advise to know when your sail trimming is correct. Would be to join a
racing club. Not only will you get the maximum speed. You will also learn
how to sail at peak performance all the time.
Buy a bung and clean your impeller often. Then bung keeps the water from
gushing in when you remove the impeller from the thru hull.

Jack
"Parallax" wrote in message
m...
A

Useless Idea #3729
s Y'all know, I dislike expensive gadgets and that extends to knotlogs
with their always fouling impellers but I would really like a
knotmeter that will help me really tell when my sail trimming is
helping (I admit, I really can't tell most of the time) and the
response time of even GPS is suspect. However, my little "KNotstik"
that drags a weighted drag behind with a spring in a cylinder has TOO
SHORT a response time and responds to every wave that passes. So, I
propose to give he Knotstik a longer response time by making the
indicator fit tighter in the cylinder and closing off the end through
the cord with the drag passes making it a sort of damper with air as
the damping fluid. This way, it doesnt respond to very fast
transients but only to longer increases in speed.

Any better ideas?

On Mon, 20 Oct 2003 07:54:29 -0700, in message
EGSkb.30495$Rd4.16904@fed1read07
"Jack Rye" .# wrote:

My advise to know when your sail trimming is correct. Would be to join a
racing club. Not only will you get the maximum speed. You will also learn
how to sail at peak performance all the time.

Racing will help sharpen skills, however, getting peak performance out
of a boat usually requires some good instruments to figure out what
works best for which boat under which conditions.

Ryk