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Yes I did :D...When I was going to bed I realized I'd gotten sidetracked and forgot what the point of calculating the angle was, it was to show that less rope contact around the branch equals less friction so more force at the TIP. The example off the top of my head was a limbwalk but yeah that...

No worries :) Yes I agree that friction most definitely matters. If I run a few different friction coefficients (guesstimates and ballpark #'s I remember off the top of my head) through the scenario I originally posted, 0.5 for a natural crotch (IIRC I saw once 0.4-0.6 for rope on wood), 0.2...

Fair enough. I don't have a horse in this race (retired from tree work 10 yrs) so 10 seconds calculator time and $0.0001 in pencil lead is good enough for a forum post :). Just thought it was interesting that the math, conceptually at least, correlated with Levi's experience. FWIW, the...

Just doing a back of the napkin calculation here with some assumptions I found a 200 lb climber with a base tie going over a natural crotch would result in roughly 42 lbf of tension on the opposite leg of rope. So a little more force at the TIP than DdRT or a canopy anchor but well less than the...

Use a 22 but teach them with a single shot. I see dads at the range all the time trying to teach their kids how to shoot but all they're doing is burning piles of ammo without learning anything. Use a one banger and teach them the fundamentals of marksmanship. It's not that the fundamentals...

They never use them :). Most gun geeks have detailed explanations for why they bought this one and how that one is perfect for something or another but the reality is they just sit in the safe and collect dust. If they actually are a range rat, chances are they have a few things that get used a...

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...