1/4 scale extra 300s kit - 1/4 scale rc airplane all this for. the extra 300s 1/4 scale with dl-50 maiden this is the great planes extra 300s aerobatic 60 size sport-scale kit the lightness of the airframe, allows it to virtually leap into the air. Sterling extra 300s scale model airplane kit extra 300s scale model airplane kit: item condition: new: