Fareastsails Tack Angle
The mast and the boom form an angle at
Masts are normally raked, (lean aft) about 1 to 1.5 degrees. We
normally set the tack angle at 88.5 degrees. This sets the boom to
be about parallel to the water line when the sail is not full. As
the sail fills with wind, the boom will rise and you do your best to
hold it back down with the sheet.
Many sailors have a dodger or Bimini to clear in the cockpit.
Sometimes these structures interfere with the boom and thus the end
of the boom needs to be higher than normal. In those cases we reduce
the tack angle to raise the end of the boom. In such cases the tack
angle might become 87 or 86 degrees. If, when the boom is level
(parallel to the waterline) it does not clear the cockpit structure,
you need to select a reduced tack angle.
A quick check is to make the boom level with the water line (or just
use a carpenters level) and when the boom is level, be sure it
clears the Dodger or Bimini. If it does, then our normal 88.5 tack
angle is good. If it is close or questionable then check the leech
length and tell us the Bimini or Dodger is an issue.
If you do select a reduced tack angle, we will then supply the
corresponding leech length.
When you have that leech length, pull a tape measure up to the
stated luff length. Use a supplemental down haul line to keep the
tape in line with the mast. Swing the tape out to the stated leech
length, connect it to the clew position on the boom (stated foot
length from the mast) and that is where your boom will set.
Alternatively, You may also specify the leech length you wish if you
know that number. The Leech measurement is a straight line
measurement from the head to the clew and does not follow a curve in
the sail (the roach). It is sail edge to sail edge. In that case, we
can advise the corresponding tack angle.