The all-welded hull of the RBY Mk 1 has 8 mm thick armour steel (MIL-A-46100) sides inclined at an angle, and a floor of 10 mm thick plain carbon steel (SAE-1020).The shape of the hull has been designed to give the crew maximum possible protection from mines. The axles and wheels are at the extreme ends of the vehicle and the effect of a mine explosion when touched off by one of the wheels is that the respective axle is damaged or cut, the glass fibre bumpers disintegrate, but the hull stays intact. The ability of the vehicle to survive mine explosions was proved in a test programme using different types of mine.The driver is seated at the front of the vehicle on the left with the commander to his right. The front part of the crew compartment can be folded down into the horizontal for incr