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That calculator looks fine to me. I didn't read everything on the page but get the same numbers. I agree with you about the importance of the line angle tied to the truck. Lower angles make a big difference. If you could even get the block slightly lower than the attachment, then the traction...

I see what you're saying. Unfortunately, doing it that way is going to lead to errors when the loads aren't symmetrical. You have the right idea, the tension of each leg has to be resolved into it's X/Y components. The trick is that ALL of the forces in the X and Y direction have to be accounted...

Yes I know. I just showed you how to calculate by how much :)

Here's an example problem I came up with of the attachment point being off center so there's two different rope angles. So to do that, all the forces pulling "up" (Y direction) are accounted for, 200 lbf is down so it's negative. Then all the forces pulling in the X direction are accounted for...

Thanks guys. I haven't worked as an Arborist in about 10 yrs but thinking about doing some rec climbing and have been bouncing around looking at all the cool new SRT stuff. Anyway, I'm not an expert by any stretch but do have some physics/engineering knowledge that I can throw at question like...

Yes and no. Yes the load would be different on each anchor. No you can't use basic trig to solve it. Or I should say, trig is used in the process of solving it but it's a statics problem, you have to account for all of the forces involved. In a basic Y shaped rigging, you can get away with just...