spinnaker size for Hunter 30

[baart]

I have been given a used spinnaker, want to try before I buy something newer. It feels a bit too big for my boat though. Leech is 10m, foot 7.6m. My boat's measurements are as below:
I = 10.13m
J = 3.20m
Spinnaker boom ~ 3.3m

Will I be able to rig it properly or shall I look for something smaller ?

Thx, B

 

[Concerto]

A spinnaker should have a luff equal to the I measurement, so this one is fine. The foot should equal twice the J measurement, so this spinnaker is too wide. A sailmaker should be able to reduce this fairly easily and a small cost.

 

[baart]

A sailmaker should be able to reduce this fairly easily and a small cost

Great news then, thank you!

 

[William_H]

It is not so difficult to reduce the width of a spinnaker at home if you have a sewing machine. Fold the spinnaker in half sideways. Then sew a line down from top to foot say half metre in from the fold. Double up on the sewing especially at the foot. Need sterength at the join in the foot. Then cut away the excess. You can cut it down to be max size for the boat or better cut down further to make it more manageable in a bit more wind or inexperienced crew. The spinnaker cloth is light so easily sewn with normal machine and thread although a heavier thread (upholstery thread is even better). It is an old spinnaker you can't do much harm. ol'will

 

[flaming]

A spinnaker should have a luff equal to the I measurement, so this one is fine. The foot should equal twice the J measurement, so this spinnaker is too wide. A sailmaker should be able to reduce this fairly easily and a small cost.

I wouldn't bother with any surgery until after you've flown it.

Especially as it's not all that wide. Suspect it'll go downwind pretty well, but won't be all that great if you hot it up. We had an S2 like that on the old boat. Wanted more area so went "low aspect ratio" as the rigger wouldn't allow us to go to a masthead hoist. Was a great sail running deep, but needed to switch out to the S3 if trying to sail above about 155.

 

[baart]

Was a great sail running deep, but needed to switch out to the S3 if trying to sail above about 155.

Ok, that makes sense. Will see how it goes first and then cut it later.

 

[hurley]

A spinnaker should have a luff equal to the I measurement, so this one is fine. The foot should equal twice the J measurement, so this spinnaker is too wide. A sailmaker should be able to reduce this fairly easily and a small cost.

Just a slight hijack ....is the rule relating to "J" the same for a cruising chute ? Thanks

 

[B27]

Just a slight hijack ....is the rule relating to "J" the same for a cruising chute ? Thanks

It's not really a rule anyway, more a guide or rough consensus.
Some of it harks back to older rating rules.
For a cruising chute, it will depend on a few things, like how high the clew is cut, whether it's a fractional rig or masthead etc.
Also cruising chutes and asy's come in a range of shapes, some are very flat, some have a lot of round in the luff and will fly further forwards.
Some are just asking for a little bowsprit....

The OP might find his kite wider than optimum in the foot, but if there's no rating to worry about, a longer spinnaker pole might be an option?
Again, even symmetric kites vary in foot round (if that's the right term?), how much longer is the foot tape than the distance across the cloth between the clews?

Flaming is rarely wrong, put it up on a light day and see how it looks.