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The general rule of thumb is the turning blocks for the spinn sheets should be approx the SPL aft of the mast (pole length).. you can play with that as Olson describes for the optimum spot - though it can change with wind angle and esp wind strength.
When the wind pipes up moving the leads forward helps stabilize the chute. Twingers do the same job without moving the leads, and are more easily adjustable to the conditions.
If you're using double sheets and guys then the guy leads can be moved forward to max beam, easing the load on the downhaul.
Another decision for you is whether or not to lead the sheets inside or outside the lifelines.. I've found with our current boat (also a relatively narrow transom IOR style) that most cases I can lead the sheets inside the lifelines to minimize the drag and force on the lifelines on most points of sail. How this will work for you depends on the exact positions of lead blocks and how high you tend to carry the kite.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Last edited by Faster; 03-26-2010 at 02:17 PM.