ATR goes off road like you wouldn't believe, it only lasts 20 minutes on a charged set of batteries when driving in rough terrain. Will last 30 minutes on paved surfaces. I got it to climb a 30 degree angle on plywood but it was extremely slow. It avoids most obstacles using its infrared but still hits stuff because it goes too fast. It can spin on its axis but turning too much wears out its battery. It beeps and makes noises too. I finally got remote control to work on it but it is too hard to control ( except for spinning on its axis). I was impressed on how well my homemade gearboxes worked.

Specifications:

Overall:
Length: 23"
Width: 18"
Height: 8"
Weight: estimated 35 lbs
Tire Size: 4" wide x 6.75" diameter
Speed: approximately 7 fps on dry pavement about 3 fps on 4" high grass

Drivetrain:
Four wheel differential steering(Rotates upon a central axis)
Two large DC drill Motors
Home Made Gearboxes with 88:1 reduction (one for each side)
Off Road tires

Chassis:
Welded aluminum Frame covered in 1/32" thick aluminum
plexi glass "window"
underside covered in 1/16" thick aluminum

Electronics:
Basic Stamp 2p-40 microcontroller with 32 i/o pins
My Own PCB for the microcontoler
Airrs (Analog infrared ranging system)
two 12v 7Ah Batteries
GSP no solder breadboard
L289n Motor driverIC on my own pcb
small speaker with amplifier
Radio shack remote control reciever

This Is my 8th and Best Robot i have ever built. Watch out for my next creation. dustinrolof@hotmail.com