the linear constrain is set to locked.
the parent’s mass set to 0.1kg
the rope can’t support the character’s weight, physics is a mess.
set the parent’s weight to 5kg.
the rope works but very heavy now.
Is there a way to just make the constrain unbreakable? No matter the parent’s mass?
i have the same problem, if you find a solution can you comment here?
Unfortunately I stopped looking for the solution a long time ago, My suggestion is you might have to write your own physics calculation for this one. since the integrated physics solver is more for cosmetics than game play. I am still curious about how to solve this one. Please let me know if you have found a solution or if you are interested, you can email me and we probably will be able to figure out a solution together. 
