Hello, I am currently trying to build my own rocket families. I found on a forum a formula to find the max payload weight your rocket can have. Using my java programming skills, I put it into a program. But then I figured out that the outcome of the formula was not correct. I tried moving stuff around, but it still wouldn't work. Whenever I tried putting a payload on my rocket that was under the payload capacity, it still didn't work, meaning their wasn't enough Delta V to get into orbit. I was just wondering if their was any formula out their, that could help me and is simple, I'm too lazy to just test different payload weights and I want to be exact. Please help.