I have two spinnakers, one is the Inter 20 spinnaker and the other is a much larger one made for the Hobie 20. Since neither was designed spec for the Arc 21 what is your opinion on which will be a good mate for the 21?
The sizes are significantly different, would thid affect the sheeting point? The I-20 sheets from the shroud and the H-20 sheets from the rear beam......?
Spinnaklers
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Eric2101
- Professional
- Posts: 205
- Joined: August 16th, 2004, 5:42 am
- Boat Make/Model: Supercat 15
- Location: Davie, FL.
Spinnaklers
Eric Arbogast
Supercat 15
Supercat 15
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Bill Roberts
- Expert
- Posts: 515
- Joined: November 17th, 2003, 9:13 pm
- Location: Stuart, Florida
ARC21 Spinnaker
Eric,
Iwould suggest you get rid of the junk and get a latest technology spinnaker made for your boat. The class with the most spinnaker development in it is the Tornado class, Ullman Sails in the US. I would suggest you get a spinnaker made to fit your boat, your luff, leech and foot measurements, and with the aerodynamic shape, camber distribution, twist, etc, developed for the Tornado.
The I20 class has had several different spinnaker cuts, most of them slow.
Bill
Iwould suggest you get rid of the junk and get a latest technology spinnaker made for your boat. The class with the most spinnaker development in it is the Tornado class, Ullman Sails in the US. I would suggest you get a spinnaker made to fit your boat, your luff, leech and foot measurements, and with the aerodynamic shape, camber distribution, twist, etc, developed for the Tornado.
The I20 class has had several different spinnaker cuts, most of them slow.
Bill
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thommerrill
- Professional
- Posts: 113
- Joined: November 23rd, 2003, 9:15 pm
- Boat Make/Model: ARC22,FMS20,F25c
- Location: Dallas, Tx
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Bill Roberts
- Expert
- Posts: 515
- Joined: November 17th, 2003, 9:13 pm
- Location: Stuart, Florida
Junk Sails, Obsolete Sails
Hi Eric,
The downwind sails that came with your boat are several years old. They were a few years old when your boat was brand new. The technology in spinnaker sails has been moving rapidly over the last five years. A two year old sail is not competitive with a new sail today. This is why the spinnaker sails you have are not the correct sails for your boat. The triangular measurements of these sails do not fit your boat and the shape of these sails, the aerodynamics of these sails, is not correct for your boat. The I20 class has several different shaped spinnakers in the field. The new sails are faster than the older sails. The H21 spinnakers were made by Hood Sailmakers, a monohull sailmaker, and their shape shows it. These sails are very full. The faster a boat sails with spinnaker in a given windspeed, the flatter the sail must be made. When you analyse the vector triangle between boatspeed and windspeed and relative windspeed, you can see that the amount of air flow field turning the spinnaker can do becomes smaller as the boat sails faster. The shape, the turning, the fullness of the spinaker must be matched to the performance of the boat.
The Tornado class has just been through the Olympics. Their spinnaker sail shapes are developed to a very high level of performance at this time. Your boat is very similiar in performance to the Tornado. A spinnaker made to the triangular measurements of your boat and with the aerodynamic shape/technology of a Tornado spinnaker would be a a best shot at the right spinaker for your boat.
Bill
The downwind sails that came with your boat are several years old. They were a few years old when your boat was brand new. The technology in spinnaker sails has been moving rapidly over the last five years. A two year old sail is not competitive with a new sail today. This is why the spinnaker sails you have are not the correct sails for your boat. The triangular measurements of these sails do not fit your boat and the shape of these sails, the aerodynamics of these sails, is not correct for your boat. The I20 class has several different shaped spinnakers in the field. The new sails are faster than the older sails. The H21 spinnakers were made by Hood Sailmakers, a monohull sailmaker, and their shape shows it. These sails are very full. The faster a boat sails with spinnaker in a given windspeed, the flatter the sail must be made. When you analyse the vector triangle between boatspeed and windspeed and relative windspeed, you can see that the amount of air flow field turning the spinnaker can do becomes smaller as the boat sails faster. The shape, the turning, the fullness of the spinaker must be matched to the performance of the boat.
The Tornado class has just been through the Olympics. Their spinnaker sail shapes are developed to a very high level of performance at this time. Your boat is very similiar in performance to the Tornado. A spinnaker made to the triangular measurements of your boat and with the aerodynamic shape/technology of a Tornado spinnaker would be a a best shot at the right spinaker for your boat.
Bill
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DanBerger
- Professional
- Posts: 280
- Joined: May 3rd, 2004, 3:29 pm
- Boat Make/Model: SC 15 w/ spin!, SC 19
- Location: Norfolk, VA
Eric,
I know someone who is looking for a H20 mast, daggers and sails. Please contact me at danberger@mindspring.com and I'll hook the two of you up...
Dan
I know someone who is looking for a H20 mast, daggers and sails. Please contact me at danberger@mindspring.com and I'll hook the two of you up...
Dan