I think, Ben, youve got confused between LEM130s and LEM200s.

The former (LEM130, commonly used at 36V and 48V) is only 3kg in weight, and produces 9hp at 36V and 12hp at 48V, and are the most commonly used motor in a vapourbot, due to their weight to power ratio - they weigh 1kg more than a Bosch 750w, but produce 8hp more.

The latter (LEM200, commonly ran at 48V and 60V) weigh 4 times more than the 130, at 12kg each, but produce more hp each, as its 25hp for the 48V model and 52hp each for the 60V. Do Or Die and my own Knyfe use them, but I use the 48V one as the 52hp combined means a minimum of 104hp, which is overdone, but Chez uses the 60V ones at his own risk

With Robo-Panda, sticking LEM200s or any LEM in is a waste, as axle-bots hardly do any pushing. Used the Bosch 750w at 36V, as it will allow to make the disc heavier and armour stronger, as you will have 10kg spare.

Look here for LEM motor info:

http://www.lemcoltd.com/lem_130.htmhttp://www.lemcoltd.com/lem_130.htm - Look here for LEM130 info
http://www.lemcoltd.com/lem_170.htmhttp://www.lemcoltd.com/lem_170.htm - Look here for LEM170 info
http://www.lemcoltd.com/lem_200.htmhttp://www.lemcoltd.com/lem_200.htm - Look here for LEM200 info