After the fascinating discussion on spinnaker lift versus 'leveraged bow dive', I'm still left wondering...
How far does the spinnaker pole need to be past the bridle to give at least enough lift to cancel out the bow-dive. Preferably, I'd like a little more lift than dive so crew position could be more flexible.
Since the bridle is where the pole will be lifting from, that is where the measurements should be taken. Also, since we are taking into account a vast number of different boats, with different distances from their forward beams to the bridles, it is the only way to communicate this issue in a fashion that covers them all.
G-Cat 5.7M #583 (sail # currently 100) in Bradenton, FL
Hobie 14T
-- Have You Seen This? --
Re: How long should a spin pole be?
[Re: Sycho15]
#13679 12/03/0203:31 PM12/03/0203:31 PM
Technically, the measurement should be taken from a point directly below the hound on the mast, as the amount that the chute "lays back" determines the angle of lift; that is, what percentage of the lift generated is vertical versus horizontal. With a pole length of zero, all lift is horizontal and you are talking about your main sail. The Aussie 18 skiffs use very long poles, and frequently triple-trap off the rack which extends 2 feet or more aft of the transom. http://www.18footer.org/Galleries/D...ternational_Championship_2002&Page=2 The boats would reverse-pitchpole if they tried that upwind. This is why we run footstraps on kite cats, very often. The short answer is "very long", and the other short answer is "it depends". It depends on the size of the sail, how much air there is, how much lee helm you can stand, and how much pole you can stand. Like I mentioned in an earlier post, some classes limit the length of the pole. All that said, I have sailed my P-19 with small chute with 11' and 12' poles and could not tell a difference; I am in the process of rigging a 15' pole now, with a larger sail, and I'll fill y'all in. I figure with modest rake, the tack will be about 16' ahead of the head, and since the luff is about 31', this works out to about 40 degrees of angle on the luff. I think.
pix upcoming, and I'll take it sailing in the spring sail fast y'all
12 footer dies on waterline length against 16 foot boats.. A better comparison would be 12s vs Kitty Cats (can you look that up on the vyc yardstick dont have time)
16teens arent unlimited skiffs (neither is the 49er) So a fair comparison in the 16 foot length isnt available.. Although around the standard 49er course I doubt if that many cats will take one..
One can compare 18 footers vs F18HT and F18.. My guess is the F18 will lose the F18HT may be about the same or a little faster..
As for spreaders.. 12, Javelins(14 foot), 14s all have twin spreader rigs if not triple.. 16 & 18s have three or even 4 spreaders..
Re: And thats not fair W..
[Re: Stewart]
#13687 12/31/0211:40 AM12/31/0211:40 AM
This is all well and good but it's not giving me any of the answers I'm looking for
Don't you use a seperate hound for the 2nd headsail halyard?
For my specific application: I have a G-Cat 5.7M and I want to run a r/f reacher on it. The spin poles will be a V shape arrangement coming off the bow x-beam (beam not foil)
I've attached a (very) rough sketch of what I want to do. I'll be using two lower windsurfer mast sections.
G-Cat 5.7M #583 (sail # currently 100) in Bradenton, FL
Hobie 14T
Are you putting on the G-Cat?
[Re: Sycho15]
#13688 12/31/0212:00 PM12/31/0212:00 PM
I want to know how you do it so I can get some ideas. I havent been able to figure the best solution out with the front beam, but it seems that should be a benefit. I know the front tramp will be a benefit as you can sew a snuffer bag right to it.
If you ran it from the main beam over the top of the front x-beam(where it could be supported side to side), then out a distance(to be decided) then supprted at the end by 2 side stays and a compression stay?
Dave Mosley
The men were amazed, and said, "What kind of a man is this, that even the winds and the sea obey Him?" Matthew 8:27
Re: Wouldnt the pole be better...
[Re: dave mosley]
#13690 12/31/0212:40 PM12/31/0212:40 PM
Then I'd waste all the lounging room on the front trampoline and I'd lose a lot of jib sail-area by having to attach it high at the bridle instead of low at the bow-beam.
I'm going for- max sail area (light winds prevail around here in the summer) and max lounging area (beautiful women abound around here in the summer... )
G-Cat 5.7M #583 (sail # currently 100) in Bradenton, FL
Hobie 14T