Tim: It's important to know the force being applied, not the pressure. Force is equal to pressure multiplied by the area of the hydraulic cylinder, and all cylinders are not the same. There's a Navtec manual on the photoalbum web site. Find out which hydraulic cylinder you have, and look up the cylinder's area in the Navtec manual. The C&C 35 uses #10 rod, with a breaking strength of 10,300 lbs. Recommended preload limit is 25% - 33% of breaking strength, or 2600 - 3,400 lbs. Absolute preload limit is 40% of breaking strength or 4,100 lbs. You can use these numbers to figure out the recommended and maximum pressures based on your cylinder size. You can also order a free, force ring label from Navtec to apply to your hydraulic gauge. Remember to specify cylinder size when ordering the Force ring label.
Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR Hi all 35-3 racers (and others with hydraulics), how much do you tension your backstay to get an acceptably straight forestay in 20-25kts? We were racing in that last night and our forestay was way looser than I wanted with the backstay at 2000psi (2 on the hydraulic panel). I have never gone above this before (1.8 seemed to be plenty for most conditions last year), but wondered what others maxed out at. I think the backstay is -10 rod with associated cylinder and we have a navtec panel that manages both backstay and vang. Thanks, Tim Mojito C&C 35-3 Branford, CT
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