Sheet lead angle

Phil,

I would love to see a sketch of what you are talking about. Most CAD formats would do.

Why did you go cold on it?

thanks

 

Phil,

Ditto on the sketch!! Any format would be great!!

Thanks,
Lincoln

 

I have rigged several self-tacking jibs and have one on my own tri. Get the lead angle close, keep the foot as low as you can and most important, get your sail maker to install a 5 hole clew plate. You will qucikly find the "right" hole for conditions. Keep It Simple! Bruce

 

I will get onto it

I will fire up Rhino and produce a couple of JPEGs and a Rhino file for any interested parties.

Give me a few days

Phil

 

Too find the (starting) sheeting angle:

1. bisect the leach and foot as discussed
2. draw a line from the middle of the luff to the clew.
3. draw third line that bisects these two lines. This is your sheeting angle.

Now for the radius...

After making the sheeting point above on the deck extend a rope (or line if you're still on the computer). Up to the forestay so it hits the forestay at 90 degrees. Drop a line vertical line down from this point onto the deck. This is the centre of your radius. Measure from this point to the previously marked sheeting point to determine the necessary radius to order.

I've used this on boats from 18 - 60 feet without an issue.

 

From mistakes I have made- make sure you have enough space between the mast and the track (if that is what you use) for your jib lead controls/other hardware. A smaller jib works better, around an 80%. I have vertical battens in mine to add a little area back and still use roller furling. bruce

 

Chris,
I am still in the computer for this portion of the build, so I will try what you suggest.

Thanks!
Lincoln

 

Did you ever get those jpegs? How about posting them??

 

I will add that if you do go with a self-tacking jib track you can still fine tune it once it is fixed by having something like three different holes on your clew plate. Another cool way to go for a non-overlapping jib is a fly-away jib pole like they use now in the Enterprise, Albacore, and Flying Fifteen classes. Should work on a catamaran.