oil rigs, or an urban suv. and in this permutation a flying jeep. this concept, called the transformer, has folding rotors that could allow it to carry four soldiers. big ideas with a practical basis. a bell helicopter that s been flying for decades. the u.s. army needs to refurbish 330 of these choppers. and avx, a small company in fort worth, thinks it has a cheap way to do it that could advance helicopter technology. this is a very unique, i don t think i ve ever seen anything like that before. reporter: instead of one rotor for lift the avx chopper has two, which rotate in different directions, using less power and make the aircraft more stable. in a traditional helicopter the rotor creates a spinning force on the aircraft. and to prevent the plane from spinning around endlessly there s a tail rotor that holds it in place. reporter: co-axial rotors eliminate the spinning and the need for a tail rotor. where the tail rotor would