I'm designing a rope bridge that will span around 40 ft over a pond. First off, I know its not recommended to build a bridge like this without having it designed by a professional. However, I plan on overbuilding it and it will not be very high. I'm also thinking about using 3 or 4 ropes to support the deck instead of the normal 2. Using the formula H = w L2 / (8 d) I've calculated the midspan force to be around 583 lbs (estimating 350 lbs for wood, 40 foot span, and a sag of 3 feet). This is without accounting for people. Here are my questions: - Will the tension be distributed across the number of ropes used to support the bridge? Ex. two ropes would be 291 lbs on each rope. - Is this the right formula to be using? Would I need to use a different formula to account for people since that weight is not even distributed? Thank you for the help!