It was 1947 when Saab began making almost 300 copies of the pusher/puller dual propellers and twin tail J21 aircraft. Sweden wouldn’t have been able to acquire an air force and so they attempted a domestic expenditure to create a fighter aircraft of original design and capable of taking on a plane in the European theater. Frid Wänström SAAB’s chief designer proposed this daring design for its time. The aircraft never saw combat although there was an air to air version and a ground attack aircraft. It was armed with a 20 mm cannon in the nose, and four .50 cal machine guns, two below the 20mm cannon in the nose and one in each wing.