# Why can't a three point anchor be calculated?

There are however some things we can tell from the angles. In this diagram we can see the maximum and minimum forces that could be on each anchor given the angles. In RigRite it would probably look something like this:

http://rigright.s3.amazonaws.com/3point-rigrite.png?_=12

What about showing how the forces would be distributed if the system was set up optimally?

**Even Loading**

It is technically possible to have an equal force on all three anchors, but only when the system is completely symmetrical as in the first diagram above. As soon as one point moves sideways (like the second diagram) it’s no longer possible to load the anchor equally.

**Optimal Loading**

So we can't achieve even loading, surely we can show how they would be loaded is the system was set up as optimally it can be, right? Sorry, it depends on what you consider optimal. The following are all ways to load the second anchor above. The angels remain the same but the tension and therefore the force on each anchor is different:

The most even way to share the force is

**62% - 24% - 24%**but this has a total anchor force of 110%The lowest total force can be achieved with

**49% - 57% - 0%**total anchor force is 106% but the third anchor is unused.You can minimise the force any one anchor experiences with

**51% - 51% - 5%**but the third anchor is still almost unused.**71% - 0% - 43%**is also possible but the center anchor is unused.

If you'd like to see three-point anchors in RigRite showing a load range please vote for this feature to let us know.