[Jaqueline Rinaldi]

Not sure how many metres of line to buy for your sheets and halyards? Below is a mini-guide on the right length to buy. It is important to know some measurements of your boat:

P= height from boom to mainsail halyard exit
E= length from mast to mainsail halyard exit
J= distance from the front of the mast to the mainsail halyard
I= height from base of mast to genoa halyard exit
A= length of forestay
ISP= height from the base of the mast to the exit of the spi halyard
LOA= length of boat

At this point, simply follow the following tables to get an approximate indication of the length of the rigging.

MAINSAIL

Hoist at the end of the boom 4:1

Sheet length = E x 5.6

Hoist at the end of the boom 6:1

Sheet length = E x 8.4
Hoist at middle of boom 4:1
Sheet length = E x 4,3
Hoist halfway up the boom 6:1
Sheet length = E x 5,7
Halyard length (in metres) = LOA (in feet)

e.g. a boat 10 feet long will have a mainsail halyard 10 metres long

JIB/GENOA

Cruising roller
Sheet length = LOA x 1.40
Racing genoa 155%
Sheet length = LOA x 1.20

Racing genoa 135%

Sheet length = LOA x 1.15

Racing genoa 100%

Sheet length = LOA x 1.05

N.B. Increase these lengths by 20% if the line passes through a block aft.

For the genoa halyard there are no “tricks”

Halyard length = A + I + distance from mast to cockpit

SPI/GENNAKER:

Spi

Sheet length = LOA x 2.00

Booms

Boom length = LOA x 1.80

Gennaker – gybe in

Sheet length = LOA x 2.30

Gennaker – gybe out

Sheet length = LOA x 2.7

For the spi halyard there are no ‘tricks’

Halyard length = ISPx2 + distance from mast to cockpit

Source: https://www.stalt.it/blog-scotte-drizze-quanti-metri-acquistare.html

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