Yeah, the lifter was surprisingly good. It was the drive that let me down; It has very low ground clearance (~5mm) so keeps grounding out, especially when lifting something. The wheels are 4x60mm diameter circles cut from a sheet of silicon, which are then sandwiched between two steel plates... Sounds overly complicated, but they are actually just taken from a ticket dispenser (my dad builds ticket machines). Unfortunately these had disappointingly little grip in the end, and as soon as the wheel nut becomes a little loose the discs just spin on the shaft. I've since added a pair of bolts through each wheel to stop this, but they really need to be replaced with something about 70mm in diameter and more robust.

The ESC doesn't help matters as it has a problem of locking up one or both motors you go to full throttle to fast, (which is why Richie just spins round as soon as the fight starts in the video). It's a protection feature on the drive chips, so it's not damaging anything when it does that, I just need to add a throttle ramp into the code so it gradually brings the throttle up over quarter of a second or something... For the time being I just have to be less enthusiastic on the throttle.

My last major problem is it cannot self right itself when it's on it's side. I tried adding 'whiskers' to give it a little more sideways lift, but it's not enough, and I don't have enough weight left to do anything fancy like adding Razor style wings (though it wouldn't be too hard to do if I could)... Not sure how to resolve that one...