newVideoPlayer( {"type":"video","player":"http://www.youtube.com/v/pg6LuwyNIxk&hl=en&fs=1&hd=1","customParams":[] ,"width":500,"height":332.5,"ratio":0.615,"flashData":"","embedName":null,"objectId":null,"noEmbed":false,"source":"youtube","wrap":true,"agegate":false} ); First came the rough sketch of DARPA’s DiscRotor, a helicopter whose blades retract into a disc once the craft hits a certain speed. Now we’ve got the concept video. Which hopefully means we’re that much closer to the real thing.