Shroud tensions measured on RT-10 Loos gauge
» Download North's Quick Tune Card (pdf file, updated May 2014)

Headstay is measured using swing arc method. Use jib halyard pulled downto top of black band on mast - swing forward to mark headstay. Measuredistance from mark on headstay to deck at stem.
The mast butt is measured from forward face of mast to aft edge ofbulkhead. This corresponds to forward most position in the slider.
Pre-Bend is measured at point of maximum deflection between S1 and S2 (left).
J Dimension is measured from intersection of stem at shear to forward face of mast (left.)

Contact the J/109 Experts:

Nigel Young
North Sails Ireland
+ 353 872514434
James Knight
North Sails UK
+ 44 2392 525 588