Originally Posted by TiredFeet
That brings your compression forces down a lot. His sample output lists his compression force at 144 lbs, which, if I understand your "x3" means yours is about 144/3 or about 48 lbs. Seems like you could use almost anything for a spreader bar with compression forces like that.
My forces run closer to 60 or lbs, but I'm heavier than TeeDee. I imagine that's the cause of the difference.
It's real easy though to hit forces that are a factor of 2 larger than these, just by sitting at one end. Or by having too shallow an angle on the suspension line (I snapped a 1200 lb rated 2.8mm Spyderline, in the field, by not paying attention to angles. Had spare cord (learned that lesson already), learned to pay attention also.)
I've heard that Walmart sells cheap hiking poles. If that's true I'll pick up a pair and try out a much reduced suspension triangle using them. I'd like to get the suspension within the tarp!
Finally, 50 lbs can bend a PVC spreader lot if the forces aren't centered! Been there, done that, and escaped with my life, just.