I need a bit of help here, as part of a class project i was trying to explain how fusion, binding energy, reactors etc work. I always like to go a bit more indepth than the syllabus requires, and i wanted an explanation of how D-T fusion worked mathematically, to clearly show how the binding energy becomes output energy - however, whenever i do the calculations, i don't get the same net energy output as I find online, 17.6 MeV. I always end up with about 17.1. I tried to compensate for the initial energies, relativistic masses and the coulomb barrier, but I'm still not a huge deal closer. Can anyone give me any clues as to what i may be missing? If nothing is obvious i'll add a brief of summary of the calculations i did. Thanks, Tom.