Matching head stay length and spinnaker size

Head stay length if launching without a spinnaker sleeve*		Head stay length if launching with a spinnaker sleeve*		Size you need to order for your spinnaker (and optional sleeve)	Asymmetrical Spinnaker Area	Symmetrical Spinnaker Area	I measurement in meters **		J measurement in meters ***
from (m)	to (m)	from (m)	to (m)				from	to	from	to
9,2	9,7	9,45	9,95	Size 1	37 m2	45 m2	8,6	9,4	2,3	3,4
9,8	10,4	10,05	10,65	Size 2	43 m2	51 m2	9,2	10	2,5	3,7
10,5	11,1	10,75	11,35	Size 3	50 m2	58 m2	9,8	10,7	2,7	3,9
11,2	11,8	11,45	12,05	Size 4	57m2	65 m2	10,5	11,4	2,9	4,2
11,9	12,5	12,25	12,85	Size 5	64 m2	73 m2	11,1	12,1	3,0	4,4
12,6	13,3	12,95	13,65	Size 6	75 m2	82 m2	11,8	12,9	3,2	4,7
13,4	14,1	13,75	14,45	Size 7	83 m2	92 m2	12,5	13,8	3,4	5,0
14,2	14,9	14,55	15,25	Size 8	94 m2	103 m2	13,3	14,4	3,6	5,2
15,0	15,8	15,35	16,15	Size 9	106 m2	116 m2	14,0	15,3	3,8	5,6
15,9	16,7	16,25	17,05	Size 10	118 m2	130 m2	14,9	16,1	4,0	5,9
16,8	17,7	17,25	18,05	Size 11	133 m2	145 m2	15,7	17,1	4,3	6,2
17,8	18,7	18,25	19,05	Size 12	148 m2	162 m2	16,6	18,1	4,5	6,6
18,8	19,6	19,25	19,95	Size 13	165 m2	182 m2	17,6	19,0	4,8	6,9
19,7	20,6	20,15	20,95	Size 14	183 m2	199 m2	18,4	19,9	5,0	7,3
20,7	21,6	21,15	21,95	Size 15	204 m2	220 m2	19,4	20,9	5,2	7,6
21,7	22,6	22,15	22,95	Size 16	223 m2	241 m2	20,3	21,8	5,5	8,0
22,7	23,6	23,15	23,95	Size 17	243 m2	265 m2	21,2	22,8	5,8	8,2
23,7	24,6	24,15	24,95	Size 18	265 m2	288 m2	22,2	23,8	6,0	8,5

Spi Asymetrique i-Sails Spi Symetrique i-Sails

* Head stay length is measured from the bearing surface on the spinnaker shackle to the tack point - just hoist a tape measure to maximum height and measure - you are done!

** I measurement is rarely needed, only to confirm your size selection if you have doubts. I is measured from the bearing surface on the Genoa shackle at maximum hoist; and the point where the mast meets the deck at the mast base. Just hoist a tape measure to maximum height and measure - you are done!

*** J measurement is rarely needed, only to confirm your size selection if you have doubts. J is measured horizontally from the bearing surface on the tack hook for your genoa; and the forward surface of the mast.