Join Date: Feb 2012
Location: Houston, TX
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You could do the calculations for the area and depth required for the plates based on the forces associated with crew going overboard on a jackline/tether/harness arrangement. Could also just use the lowest breaking strength of the jackline/tether/harness components. The thinking is you don't need an attachment point that greatly exceed the breaking point of what attachs to it (but still exceeds, say by 20 to 50%).
Jackdales recommendation was for u-bolts in the cockpit, now that I read it again. It is a really good idea to have points you can tether to while in the cockpit so you stay in the cockpit. If tethered to the jackline running from stern to bow, you could be swept from the cockpit. I simply wrap my tether around the backstay when I am in the cockpit. Haven't done the math, but am confident the backstay will support the forces and the distance isn't so much that I'd end up being dragged behind the boat.
[/B]S/V Wind Orchid
Catalina 350 (hull# 273)
LET'S GET SERIOUS ABOUT REMOVING POLITCAL TAG LINES -- NOW!