The standard boat has ball bearing adjustable genoa cars and pin-stop jib cars further forward on a separate set of tracks. In discussion with the sailmaker, it was decided that having fully adjustable jib cars would be very important to allow you to change gears easily when sailing with the non-overlapping #3 headsail. We added a second pair of the HAR1537 Midrange genoa cars over the pin-stop cars.
Harken UK designed a system to achieve the simultaneous adjustment of both cars, using the existing puller system and adding some extra parts. The biggest problem faced in order to achieve this is to get sufficient power to adjust the highly loaded #3 car, while retaining sufficient travel to have the wide range of adjustment required for the large overlapping headsails. We managed to achieve this by setting up the jib car on an 8:1 purchase and the genoa car on a 4:1.
Now, here comes the science bit! The main purchase is a 4:1, using a HAR2655 and a HAR2656 40C Fiddle, leading to a HAR150 Cam-Matic®. For the genoa car puller we led a strop from the floating block around the existing single block mounted just aft of the shrouds and then back to the car. The jib car puller runs from the purchase floating block forward to a special single end control, HC7075, and then there is a 2:1 purchase fitted to the front of the car, giving an 8:1 control. Thus, the relative travel of the jib car is exactly half that of the genoa car, due to the 8:1 purchase on the jib and 4:1 on the genoa. This allows the full range of movement of both cars on their tracks.
JIB SHEET INHAULER
Due to the design of the coachroof being relatively wide, a jib inhauler is required to reduce the sheeting angle for the non-overlapping #3 jib towards a more ideal 7 to 8 degrees to allow better pointing.
A 2:1 purchase through a floating stainless steel ring for the sheet is the simplest way to start an inhauler. In this case, the dead end is on the mast collar, with a snapshackle and an extra 200mm strop spliced in so you can fully release the inhauler for wide-lead blast reaching with the #3. The control line runs back through a HAR2600 57C block attached to the mast collar before running back through a HAR350 29C Cheek block to deflect the lead around the hatch garage, before leading back to a 4:1 purchase made up from a HAR2655 40C Fiddle block and a HAR2637 40C single and becket, leading to a HAR150 Cam-matic® cleat and HAR375 Extreme Angle Fairlead. This gives a total purchase of 8:1, which is sufficient to easily adjust this control when under load. Note: calibration strips allow you to reproduce fast settings easily.
A 2:1 initial purchase leads
through a ring for the sheet and
then to a block at the mastbase.
The final 4:1 purchase lead
aft to the cockpit.
Note the calibration strips.
Note: Text and images courtesy of Harken Yacht Equipment.
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