The exhaust gases were conducted through two thrust tubes within the wing roots, exiting below the trailing edge of the wings. Although this arrangement was unusual, it meant that the aircraft's centre of gravity remained virtually unchanged, so the design costs for the new jet aircraft remained within reasonable limits as planned, and numerous components from the ‘Triana’ production could be adopted almost unchanged. Over the course of the following months, a number of design changes emerged. The final design was then significantly heavier, but also had a considerably greater range and payload. Messerschmitt was often personally involved in the design process.
In addition to further developments in subsequent years concerning the engine and weight – version and export series designations: A to D – HASA also pursued numerous plans to further develop the ‘Saeta’ into a pure fighter aircraft.
This initially resulted in the HA-200 E test vehicle, which made its maiden flight on 16 May 1965 and, despite extensive and successful testing, met with little official interest. Nevertheless, between 1967 and 1971, all 55 HA-200 Ds were retrofitted to this standard.
HA-200 of the Spanish Airforce © Airbus Heritage
On 25 April 1970, the prototype of the significantly improved HA-220 ‘Super Saeta’ (XC-10C) fighter aircraft, equipped with Marboré VI engines (each with 4.7 kN (480 kp) thrust), took off on its maiden flight. The aircraft was designed as a single-seater – the rear cockpit now housed an additional fuel tank – and could carry an impressively extensive weapon load. With the delivery of 25 production aircraft of the ‘Super Saeta’ by 1972, production of the HA-200 in Seville finally came to an end.
The ‘Saetas’ and ‘Super Saetas’ proved themselves extremely well throughout their service with the Ejercito del Aire, which only ended in 1982. Their operational reliability in particular was exemplary. Many aircraft were scrapped after being taken out of service, but an equally impressive number of ‘Saetas’ have been preserved to this day. Many of them ended up in the USA, while others are now in European museums. Some of these aircraft are still flying, such as the HA-200 D of the Willy Messerschmitt Foundation and Airbus, which is stationed at the Messerschmitt Aviation Museum in Manching. It has now been given a special lettering to commemorate the 70th anniversary of the maiden flight of the legendary arrow from Seville.