Now I've got a couple of minutes spare I can offer what I have learnt after running Inertia XL for a few years

The 2013 version that keeps being mentioned was by far the worst of the ones that I have built. I tried to make it too powerful for its own good and as a result found loads of issues with it. The first one being that to fit the Sidewinder in to drive it (was the only speedo we had at the time that could handle 8s) I had the move the entire disc mechanism forward by around 30mm which meant that the wheels were too far back. That, coupled by the switch to the A123 batteries meant that there was no weight over the wheels. The original one had 1.5kgs of Mi-Mhs at the rear to keep it level. This is why the old one had the big boxy back end. Also the change in design did allow it to drive upside down should the disc stop working.



In the video that Nick linked to above there was only one wheel working fully as one was completely loose. When this was fixed the drive was significantly better which can be shown in the two fights with Tormenta 2 from later on in that event.

Also the HDPE bulkheads worked very well and I still have both sets intact and could be used again. The black ones fom the 2013 spec had bearings fitted and worked perfectly even with the 10mm HDPE base as it meant that there was enough flex to absorb big impacts without permantly distorting.

That being said for the latest version I am switching to the 15mm Aluminium bulkheads and moving to a different design with 4WD. The front wheels are in line with the disc to hopefully give good control. Now that I have a reliable source of income it may make an appearance in some whitboards next year as I've got the inclination to finish it at last.

Hopefully this makes some sort of sense as I didn't really plan what I was going to write first