Compare with pedrail car photograph, annulus type car develops in road system the advantage of the area is more clear, motor-driven ability is better. But if reached ground of field of desolate place outside of town, desert snow these landform in the environment with complex, harsh condition, even if is the car also meets round of most powerful pattern unable to do what one wants very much to do. Recently, advanced research plans national defence of the Pentagon research organization bureau (DARPA) offerred a solution with the partner -- two seconds of changeover that can come true to be turn for pedrail from the car! "The wheel can move quickly in solid surface, and pedrail is better in limp exterior performance. The technical group of center of engineering of university country robot revealed Kaneijimeilong ' get used to alterable form wheel oneself ' , this plan can realize circular wheel and triangle when car travel the mutual changeover of pedrail annulus, so that improve tactical maneuverability and the suiting to different landform immediately ability. " in the video of exposure, car of bold horse experiment completed this one transition namely inside two seconds. "Get used to alterable form wheel oneself " it is DARPA " ground X chariot " (GXV-T) the project of a research of the plan. GXV-T plans to aim not to add the maneuverability that prospective chariot raises below more armoured circumstance, live gender, security and effectiveness. Compare with current armor chariot phase, new-style chariot has a lot of improvement place: Dimension and weight decrease 50% , the member that the operation is multiplied decreases 50% , floating rate rises 100% , can get used to the landform of 95% , reduce can explore a gender. New-style chariot has smaller size, more light and nimble, can with faster speed travel, have similar and modern trade to use the cockpit of the plane, the posture that can enhance the member that multiply feels ability, the visual sense with be had certain, infra-red, acoustics with ability of electromagnetism concealed body, can lower the machine rate that is discovered by the enemy. Center of engineering of university country robot develops DARPA and Kaneijimeilong " get used to alterable form wheel oneself " the cross-country ability that aims to promote chariot and landform get used to ability. So original design is provided extremely revolutionary! Of course, at present this technology still is in experiment phase, this does not mean it to be able to throw actual combat to use. If this kind of wheel throws production finally, cost, complexity and wear, these are crucial places. Nevertheless, it is very practical that this technology can say, bold Ma Helian closes light-duty tactics vehicle (JLTV) , get on OK applying as to car of older armor carry arms therefore " get used to alterable form wheel oneself " . For instance the Marine Corps needs to go to inland area to transfer from beach, of special type army fight the environment is more complex, if wheel and pedrail can be changed immediately, chariot is met more agile, the moment of truth can be helped fight personnel escapes dangerous area. Civil domain, such design also is old useful way, execute the law the branch, branch that rescue and rescue and provide disaster relief the team can depend on this kind of ability to make round of type car straightway in all sorts of road surface conditions. Of course, this kind of design that shows science fiction slightly becomes reality to still not short way wants. . . . . .