James, its in the Heavyweights topic. And Bens other tread about speedos was also in the heavyweight section, so I do think he ment to build a heavyweight robot.

But my list of parts works as well for any weightclass.

Ben, I can give you the examples of Team RCC.
Currently we have Obsidian ready to go, an Axe Robot that uses pneumatics to power an 8 kg axe.

Drive is a rather classic 2 Bosch 750 GPA motors driving kartwheels by chains and sprockets- 6-1 reduction ratio.
24V 11.1A NiMH pack (60 cells), Spectrum DX6 RX/TX setup and a Robotpower Sidewinder speedo completes the picture.

Weapon is a Custom build Maddox Ramrack and pinion setup, used @ 14bar. A 2kg CO2 bottle holds all the power for the weapon.

Armor, a bottom plate of 5mm 6082T6 aluminium and a 15mm-20mm plastic shell (HDPE) completes the Triad of Power in this machine.