I have a new this season stock Hunter 216 jib with integrated stay off my boat now that I have put the boat away for storage. I can lay it out and measure but I would need to know what dimensions you need. If you can provide some detail about what your sailmaker is asking for I’m willing to help
Thx, I would like the forestay length, and the three sides. How much stretch allowance did you have?
Thx, the boat is all put away for winter and some measurements would be hard to get. I had assumed that a sailmaker would have access to these himself in sort of magical database. I think the issue I would have taking these measurements is the sheet angle is pretty critical for a fixed jib lead and I'm hoping to avoid putting that on for now.The owner should get instructions from a sailmaker on how to measure the the rig and deck hardware. It takes a minimum of 7 accurate measurements to determine the 2D design of a headsail ( and a bunch more to double check and catch measurement errors and gather hardware requirements).
I and j are simply two sides of a right triangle that can be used to calculate an approximation of sail size. It’s good enough for a sail maker to do a quote, but wildly insufficient for designing the 2D dimensions of the three sides of a headsail.
Judy B
Semi retired sailmaker
Where did you get 80 sf from? Did you use I x J *0.5 = 80? I and J are used for comparison with other boats and that's all they're good for. They have virtually no bearing on the finished dimensions of a sail.
I will get the sail out and measure it later today.
en.m.wikipedia.org
The 80 sq ft comes from the original specs. We have pretty light wind days during the summer so the extra few feet might be useful.
So a bunch of pictures attached. Not sure what you mean by stretch allowance???
The centerboard storage is new to me. I'll look for some more info. Thx.I will get the sail out and measure it later today.
This is the Wiki on the Hunter 216 if you don’t have it.
Hunter 216 - Wikipedia
The Wiki lists a bunch of info including the sail area of the jib at 80sq ft. I have no idea if that is accurate as I have very little experience in how to measure and then calculate the area of a sail as as @DrJudyB indicated (from vast experience BTW) it’s not just simple math.
The jib on the 216 has the forestay integrated into it and the cleats to manage it are not adjustable so I don’t know if you have a lot of options for new other than material choice and I guess panel layout. I have found that most of the power on this boat comes from the big mainsail.
You mention you have put your bait away so I just want to ensure you are aware of the need to remove the Sailtec hydraulic centreboard lift and then store the unit upright.
The stretch allowance is because the sailmaker says sails will stretch over their life and he was intending to make the sails a 1% smaller to allow for this.
Out of my depth of knowledge on that one. When I bought our 216 it came with original sails and a new main and jib that the PO had purchased from the SBO store but never used (strange but true). The originals were pretty bagged out so after I sailed the boat a couple of times I switched to the new ones.
This is where I got myself confused. My old sail measure exactly the same. When I calc the area based on the photos, it comes to 68.5 sq ft., same as my old sail. I assumed this was an incorrect since the specs say 80 sq ft.
I think the sq tops are sexy, but decided to go ahead with a traditional design. I thought the sq top would need too much leech tension to keep from twisting off and the 4:1 mainsheet mounted mid-boom wouldn't be up to task.
