Its a typo! the largest aerial mine was 1000kgs and the largest bomb was 2500kg This link gives details of the aerial mine! http://www.warbirdsresourcegroup.org/LRG/sb1000para.htm
ahah, well done Morse. So that's where that page has moved to. I had the old link which is now dead, and there was no redirection. Couldn't find it again.
