If you're asking for the weight in tonnes, shouldn't you have the range in km? And I don't think that's the plural of Hercules... though it's one of those tough ones, a bit like mongoose because you know that neither mongooses nor mongeese sounds remotely right, which is why most of us pros stick to "C-130s" or "Fat Alberts" and there is not a proper Latin plural for Hercules (he was Heracles in Greek, like the HP.42... by the way, did you know that Imperial Airways had a Hercules and a Heracles?) anyway.