The Dornier Do 335 Pfeil ("Arrow") was a World War II heavy fighter built by the Dornier company. The two-seater trainer version was also called Ameisenbär ("Anteater"). The Pfeil's performance was much better than other twin-engine designs due to its unique "push-pull" layout and the much lower drag of the in-line alignment of the two engines. The Luftwaffe was desperate to get the design into operational use, but delays in engine deliveries meant only a handful were delivered before the war ended.
Source: Wikipedia, "Dornier Do 335", available under the CC-BY-SA License.
As Described In
Secret Weapons of the Luftwaffe: Nicknamed the Pfeil, or "arrow," the Do335 featured an unusual tandem engine arrangement, with one mounted in the nose and one in the tail. This "push-pull" effect made the Pfeil one of the fastest prop-driven aircraft ever built, with a top speed of 475 miles per hour. But mutual interference problems stemming from the two propellers, plus the continued push for Dornier to produce bombers, delayed production of this promising fighter.