Here's my entry:

Pingu

Shape -


As you can see it has two large tanks (1500mm long 500mm diameter) made from closed cell foam with 1mm titanium coat (just to hold it together not for protection- designed to have chunks taken out by axes) even with punctures still won't sink. These tanks have Archimedes screws on them to break up the ice and propel it through the water like this machine:


Colour - the tanks are painted black, the central section is white and the flipper arm is orange (looks like a penguin!) if I have time I'll upload a picture to show the colours!

Weight - 100kg

Motors – Uses bosch 750 motors with mod 2 gear reduction (10-1) then a 3:1 reduction via 50mm wide timing belts directly to the drums. This should give a reasonable speed as it doesn't need much power

Batteries: 3x 6s lipo battery 10Ah in series

Wheels - none, just uses the Archimedes screws for propulsion and flotation

Speed - 12mph

Clearance - the middle section of the robot is slightly submerged by 15mm so the bottom is all sealed

Armour - the central section is made of 3mm titanium with an aluminium angle frame supporting all the components near the middle of this box so even if some water gets in hopefully it will avoid shorting and most axe weapons won't get close enough because of the large lightweight tanks. The front wedge and flipper arm is made from 4mm hardox

Dimensions - huge! 1.5m long, the tanks are 500mm diameter and the central box is 400mm wide, 250mm high

Weapons - It has a pneumatic four bar flipper on the front, small full pressure ram 30mm bore 100mm stroke. This is designed to turn over other robots hopefully to sink them or make there drive/weapons useless. The whole pneumatics system is in a different section of the robot which can be flooded with water as obviously pneumatics is water tight, it is separated from the electronics via a waterproof and sealed wall with only the wires for the vice coming through.
I will also use the drive to break up the ice around non-submersible robots or obits which work better on the ice.

Scrimech: it can run inverted, the whole middle box is sealed with silicon so it can be fully submerged and turned upside down, the drive works upside down but no the weapon .

The whole thing has to be very light weight to due to the large tanks on both sides even though they don't weigh much. The "screw" part of the archimedes screw is made from 6mm titanium.

Hope that's all ok.