I doubt the geometric calculation you are using will work. A straight line at right angles to the mast will likely cross the bow line below where the forestay attaches. If you have a halyard that turns near where the forestay attaches, you likely will get a closer approximation than the geometry method.
According to sailboatdata.com Est. Forestay Len: 41.27 ft / 12.58 m Seems your calculation agrees with that. On Wed, Jan 19, 2022 at 7:51 PM Randy Stafford via CnC-List < cnc-list@cnc-list.com> wrote: > Hello Listers, > > Does anybody know the forestay length of a 30 MK I as it came from the > factory, with the rig properly tuned for 8” of mast rake? > > By geometry (square root of I squared plus J squared) I’d expect it to be > in the neighborhood of 41’3”. I is 39’ for a 30 MK I, and J is 13.5’. > > According to the owner’s manual the forestay cable is 1/4” and the lower > fitting is <quote>1/2” jaw to jaw turnbuckle & toggle</quote>. On mine, > the cable is swaged into an eye fitting on the lower end, which is pinned > to a turnbuckle screw that’s probably 1/2” jaw to jaw (if that’s what’s > meant by the owner’s manual). The screw at the other end of the turnbuckle > is identical, and is pinned to a toggle that’s pinned to the bow stem. > Picture at > https://drive.google.com/file/d/1ZT794BQaw0R8aWZCK9NqmVqRJ9K85VT9/view?usp=sharing > . > > I’m wondering if this is the standard from-the-factory setup, and what the > overall forestay length is from pin at masthead to pin at bow stem, when > the rig is properly tuned. > > Thank You, > Randy Stafford > SV Grenadine > C&C 30 MK I #79 > Ken Caryl, CO > Thanks to all of the subscribers that contributed to the list to help with > the costs involved. If you want to show your support to the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks > - Stu
Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
