| Title: | SAILING |
| Notice: | Please read Note 2.* before participating in this conference |
| Moderator: | UNIFIX::BERENS |
| Created: | Wed Jul 01 1992 |
| Last Modified: | Mon Jun 02 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2299 |
| Total number of notes: | 20724 |
Ever wonder if that port tacker will pass behind you,
pass ahead of you, or T-bone you? If you're both close
hauled and in similar boats, then tacking lines can give
the answer.
To put tacking lines on your boat, find a flat spot with
good visibility and mark a line a foot long parallel to
the fore and aft line of the boat. Intersect this line
at its midpoint with another line with the angle between
them equal to the total tacking angle of the boat. This
is the number of degrees tack to tack plus a few degrees
for leeway. Should be about 80 - 90 deg. Then bisect the
two resulting angles. You'll have half a pie chart divided
into four slices.
Sight over line A to tell if boats to leeward on the opposite
tack are ahead or behind. Sight over line C to tell if
boats to weather on the same tack are ahead or behind.
Use line C to tell when to tack to lay a mark or clear
an obstruction.
A OPPOSITE TACK
| LWD *
| AHEAD *
| * LWD
| * BEHIND
| *
|------------------------- B
|* WINDWARD
| * AHEAD
| *
| *
| *
WINDWARD C SAME
BEHIND TACK
- gene
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1257.1 | Simplify, Simplify! | CSSE::COUTURE | Abandon shore | Thu Jun 22 1989 10:27 | 9 |
Seems like a pretty complex method to me! I like simplicity! If the
angle from the approaching boat to your bow is decreasing, he'll pass
in front of you. If it's increasing, he'll pass behind. If it doesn't
change, you're on a collision course.
In practice, I use the lifeline stanchions to sight the approaching
boat. If it appears to move forward of the stanchion, the boat will
cross your bow . . . etc.
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| 1257.2 | Stanchions? What Stanchions? | STEREO::HO | Thu Jun 22 1989 14:17 | 7 | |
But my boat doesn't have any stanchions!!!
8^)
- gene
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| 1257.3 | I don't got to show you no stinkin stanchions! | CSSE::COUTURE | Abandon shore | Thu Jun 22 1989 14:53 | 13 |
Sorry, I forgot you're a racer! In that case, you can simply take a
chain saw and cut grooves every 36" along the gunnels where the
stanchions SHOULD be. From what I'm told this won't affect your
PHRF rating in the least and will help drain green water off your
deck into the bilge where it will help lower your center of gravity
and increase your LWL . . . all at no penalty.
Who said us cruisers don't know nothin 'bout racin no sailboats!
:-)
Adam
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| 1257.4 | Huh? | AKOV12::DJOHNSTON | Thu Jun 22 1989 18:06 | 6 | |
Gene, from your drawing do I understand that you sight alonb line
C to know when to tack to lay a mark? That would appear to be well
back of abeam. I'm missing something here.
Dave
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| 1257.5 | Touche Dave!! | STEREO::HO | Fri Jun 23 1989 09:46 | 12 | |
Re .4
Whoops!! Can't type. Should be sight along line **B** to lay a
mark.
Re .3 Not only does Touche lack stanchions, we don't even have
a PHRF rating. We race one design. I've frequently thought about
taking a chainsaw to my boat but usually for reasons other than
enhancing performance.
8^) - gene
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| 1257.6 | ASHBY::NELSEN | Thu Jun 29 1989 17:20 | 5 | ||
re .0: I rarely wonder what the port tacker will do ... since I'm on
starboard. :)
/Don
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