En el ISAF vienen especificados los tamaños y la posición, en inglés lo he encontrado y dice lo siguiente:
"G1.2 Specifications
(a) National letters and sail numbers shall be in
capital letters and
Arabic numerals, clearly legible and of the same colour. Commercially
available typefaces giving the same or better legibility
than Helvetica are acceptable.
(b) The height of characters and space between adjoining characters
on the same and opposite sides of the sail shall be related
to the boat’s overall length as follows:
Appendix G IDENTIFICATION ON SAILS
93
Overall length
Minimum height Minimum space
between characters
and from edge of sail
under 3.5 m 230 mm 45 mm
3.5 m – 8.5 m 300 mm 60 mm
8.5 m – 11 m 375 mm 75 mm
over 11 m 450 mm 90 mm
G1.3 Positioning
Class insignia, national letters and sail numbers shall be positioned as
follows:
(a) Except as provided in rules G1.3(d) and G1.3(e), class insignia,
national letters and sail numbers shall when possible be wholly
above an arc whose centre is the head point and whose radius
is 60% of the leech length. They shall be placed at different
heights on the two sides of the sail, those on the starboard side
being uppermost.
(b) The class insignia shall be placed above the national letters. If
the class insignia is of such a design that two of them coincide
when placed back to back on both sides of the sail, they may be
so placed.
(c) National letters shall be placed above the sail number.
(d) The national letters and sail number shall be displayed on the
front side of a spinnaker but may be placed on both sides. They
shall be displayed wholly below an arc whose centre is the
head point and whose radius is 40% of the foot median and,
when possible, wholly above an arc whose radius is 60% of the
foot median.
(e) The national letters and sail number shall be displayed on both
sides of a headsail whose clew can extend behind the mast 30%
or more of the mainsail foot length. They shall be displayed
wholly below an arc whose centre is the head point and whose
radius is half the luff length and, if possible, wholly above an
arc whose radius is 75% of the luff length."
Uf, he marcado en negrilla lo importante porque me he copiado casi todo el texto del
apéndice G.
Resumiendo, para un barco de entre 3.5 y 8,5 m los números deben medir 30 cm de alto.
Yo los tengo pero aún no los he puesto, también me parecen bastante grandes para mi vela de 16 m2 pero si lo dice la ISAF...
Lo he encontrado en español, son las normas de crucero hasta 2012:
http://www.rfev.es/archivos/2009/04/rrv-2009-20121.pdf
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