I just picked up a used spinnaker off e-bay and have a few questions for those more adept with these things. First is the I dimension if the sail is a few feet shorter than the boats spec, and the J is longer than the boat spec. How severely will this effect the performance of the spinnaker. I'm guessing the sail area will turn out about the same. Second is the seller advertised this as a poleless racing chute, rather than an assymetrical. Is there a difference? Not that this is a problem, as I will have the sail cut correctly if it is different. Tell me what you think?
Actual Size of an assymetrical spinnaker
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Stu Sauer
Asymetrical Spinnaker Size
I was trying to find the same type info a while back. PHRF formula is difficult to decipher but in general the luff can be 1.1 x "I" dimension and the foot can be 1.8 x "J" dimension with other factors relating to oversized spinnaker pole lengths. Yours sounds smaller than the maximum in both cases.
I was trying to find the same type info a while back. PHRF formula is difficult to decipher but in general the luff can be 1.1 x "I" dimension and the foot can be 1.8 x "J" dimension with other factors relating to oversized spinnaker pole lengths. Yours sounds smaller than the maximum in both cases.
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Bruce
Foot or LP?
Is the 1.8 multiplier applied towards the LP or the foot measurement? I would think the LP would be more akin to a symmetrical's "girth" measurement.
Is the 1.8 multiplier applied towards the LP or the foot measurement? I would think the LP would be more akin to a symmetrical's "girth" measurement.
Foot for Spinnakers
LP does not work on Spinnakers, Symmetric or Asymmetric, as luffs have Arc to them. Asymmetrics can vary from one Area to another. In West Florida PHRF the rule pertaining to Foot and Midgirth reads as follows: Asymmetric Spinnaker foot(SF) shall not exceed 1.8 x Jc. Mid Width(ASMW) shall not Exceed 1.8 x Jc. Mid width shall not be less than .75 x SF Jc is J dimension plus any extension of J by pole or sprit to tack point of spinnaker.
LP does not work on Spinnakers, Symmetric or Asymmetric, as luffs have Arc to them. Asymmetrics can vary from one Area to another. In West Florida PHRF the rule pertaining to Foot and Midgirth reads as follows: Asymmetric Spinnaker foot(SF) shall not exceed 1.8 x Jc. Mid Width(ASMW) shall not Exceed 1.8 x Jc. Mid width shall not be less than .75 x SF Jc is J dimension plus any extension of J by pole or sprit to tack point of spinnaker.
So..... is there an answer to my orginal question
Thank you all for the discussion, but still no answer to my question. Will the sial fly well for my set up, and am I correct in assuming the seller was talking about an asymmetrical when he said "poleless?"
Thank you all for the discussion, but still no answer to my question. Will the sial fly well for my set up, and am I correct in assuming the seller was talking about an asymmetrical when he said "poleless?"
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scott wilson
Millam39, state your question in different terms
as "J" and "I" are boat measurements not sail measurements. Are you saying the sail came off a boat with different values for the "J' and "I" than on your boat? If you are not going to use a pole (pole is usually w/in a few inches of equaling the "J") then your "J" is not going affect the flying of your new chute. If your boat's "I" value is different from that of the boat the chute came off of,a couple of feet difference shouldn't matter regarding sail performance and if your "I" is larger the sail will just fly higher off the deck, which is fine for the conditions you would be using the chute for. I was in your same situation a few months ago. I had an unknown spinnaker in a bag on the boat when I bought it. I just pulled it out in front of my house( and across the street) and took a look at it. It turned out to be a symetrical sail and there was no pole etc that came with the boat although there was a spinnaker halyard. the luff meaured 59 feet and my mast topped out at 50 feet. I just followed the advise of responses to my posting here, which was to just head out in 5 knots of wind, leave the main down, and hoist the spinnaker using a "tacker" set up on the forestay and see what happens. We hoisted upside down, sideways, twisted and backwards. Had a great time and figured out the sail. If you have any questions regarding rigging, just to an archive search on "Tacker", "asym" or "cruising chute". As to the description of the sail being a poleless racing chute, its probably an asym that is cut so it can point a little higher than a "cruising" chute. Hoping this was helpful, Scott
as "J" and "I" are boat measurements not sail measurements. Are you saying the sail came off a boat with different values for the "J' and "I" than on your boat? If you are not going to use a pole (pole is usually w/in a few inches of equaling the "J") then your "J" is not going affect the flying of your new chute. If your boat's "I" value is different from that of the boat the chute came off of,a couple of feet difference shouldn't matter regarding sail performance and if your "I" is larger the sail will just fly higher off the deck, which is fine for the conditions you would be using the chute for. I was in your same situation a few months ago. I had an unknown spinnaker in a bag on the boat when I bought it. I just pulled it out in front of my house( and across the street) and took a look at it. It turned out to be a symetrical sail and there was no pole etc that came with the boat although there was a spinnaker halyard. the luff meaured 59 feet and my mast topped out at 50 feet. I just followed the advise of responses to my posting here, which was to just head out in 5 knots of wind, leave the main down, and hoist the spinnaker using a "tacker" set up on the forestay and see what happens. We hoisted upside down, sideways, twisted and backwards. Had a great time and figured out the sail. If you have any questions regarding rigging, just to an archive search on "Tacker", "asym" or "cruising chute". As to the description of the sail being a poleless racing chute, its probably an asym that is cut so it can point a little higher than a "cruising" chute. Hoping this was helpful, Scott
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