the last post appeared whilst i was typing the above :P we have a fair bit of experience with pneumatics. We started of with the feathers, in G2/G3 we started with a compressor flipper over a year ago, then it got changed to Co2, It now uses a 63mm bore ram and is probably the most powerful LP flipper on the circuit. The heavyweight uses a FP system.

Ive overcome the ram problem by having it at a awkward angle, but due to the power it overcomes this. Due to the size of ram it really has to have a buffer, the twin regulators was just going to help with filling the buffers up quick. I dont know many regs that can fill a 80x210mm ram quick enough.

I am using the gearboxes on the motors, they have been slightly altered but still need the 12inch wheels (which makes the robot look rather odd!). My chassis is mainly made from 1mm wall 25mm steel box, with 2mm thick used on the flipper.