SailNet Community banner
1 - 4 of 4 Posts

Senior Moment
1,931 Posts
They are rig dimensions primarily used by sailmakers to know how to size a sail. Loose definitions of them are:

I= distance from deck to where the forestay attaches to the mast
J= Distance on deck from forestay to the mast
P=Distance from top of mast to boom.
E= Length of boom.

I say "loose" because the actual dimension may be (for example for P) to a black line at the top of your mast, which is the highest point the main will be raised to.

1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.