In terms of penetrating, I think that the 4 tonnes is enough, as long as you have a harder material (please correct me if I'm wrong guys!)
The EN36 is (slightly) less hard than Hardox, so may begin to deform before puncture, but is less brittle,so less likely to shatter in impact or under extreme loads. You could also case harden it, but again your moving more towards the failure mode being fracture.
We chose EN36 for our trials, and probably will be using it for our final design, the only change being a sharper attack angle

puncture scxreen grab.JPG



In terms of our build, our motors and speed controllers are all finally out of customs!

IMG_7596.jpgIMG_7584.JPGIMG_7585.jpg

They are terrifying now that we have them in front of us. The photos don't really give a sense of the scale. We are all quite humbled.

We have put some puncture proof wheels on order to get a rolling chassis under way.
https://www.amazon.co.uk/Pandamoto-Y...3EZ3P0PMR&th=1

And also ordered some RC gear
https://www.amazon.co.uk/Helicopter-...rds=FLYSKY#Ask

We went for the Flysky as it was recommended to us, and has pretty good reviews. It is also very cheap when compared to the spektrum alternative, and our budget has took a bit of a beating with the purchased components and customs charges!



In terms of having a rolling robot, we still need to spec lipos, a fuse and a removable link. Do we need anything else?


With the lipos, I found this very good guide.
http://rogershobbycenter.com/lipoguide/

Can somebody please weigh in on my thinking here?


If we are running 2 NPC-T64's at 8s, 29.6V
The stall Current is 110A x 2 = 220A (So the C value must be more than this)
For the mAh value, if we assume half of the stall current for operation
55A x 2 = 110A
And we look to run this for 3 mins 110A x 3= 330A in 3 mins.
for the Hour, 330A/ (60/3)= 16.5Ah
so 16500mAh? with a saftey factor on the 55A draw assumption

Looking at using the optipower partnership...
http://www.optipower.co.uk/Catalogue...cat=126&cnode=

Will 4 of these, 2 parallel and 2 series give me the equivalent of 8s, 16 000mah at 50c (800 amps)?