[Squeelig]

In December 1942 a technical commission of the Regia Aeronautica was invited by Luftwaffe to test some German aircrafts in Rechlin. The visit was part of a joint plan for the standardization of the Axis aircraft production. At the same time some Luftwaffe officers visited Guidonia where they were particularly interested in the performances promised by the Serie 5's. On December 9th, these impressions were discussed in a Luftwaffe staff meeting and raised the interest of Goering itself.

In February 1943 a German test commission was sent in Italy to evaluate the new Italian fighters. The commission was led by Oberst Petersen and was formed by Luftwaffe officers and pilots and by technical personnel, among them, the Flugbaumeister Malz. The Germans carried with them also several aircrafts included a Fw190A and a Me109G for direct comparison tests in simulated dogfights.

The tests began on February 20th. The German commission, not without a certain surprise, was very impressed by the Italian aircraft, the G55 in particular. In general, all the Serie 5's were very good at low altitudes, but the G55 was more than competitive with its German opponents also in terms of speed and climb rate at high altitudes while still maintaining superior handling characteristics. The definitive evaluation by the German commission was "excellent" for the G55, "good" for the Re2005 and "average" for the MC205. Oberst Petersen defined the G55 "the best fighter in the Axis" and immediately telegraphed his impressions to Goering. After listening to the recommendations of Petersen, Milch and Galland, a meeting held by Goering on February 22nd voted to produce the G55 in Germany.

The interest of the Germans, apart from the good test results, derived also from the developmental possibilities they was able to see in the G55 and in the Re2005. For the Re2005, the German interest resulted in the provision of an original DB605 with the new WM injection. This engine and a VDM propeller were installed on the MM495 prototype that was acquired by Luftwaffe and tested in Rechlin. The aircraft reached 700 km/h during a test with a German pilot, but the airframe was not judged sufficiently strong for these performances.

The G55 was bigger and heavier and was considered a very good candidate for the new DB603 engine. Other visits were organized in Germany during March and May 1943 in Rechlin and Berlin. The G55 was again tested at Rechlin at the presence of Milch. Gabrielli and other FIAT personalities were invited to visit German factories to discuss the evolution of the aircraft. The specifications of the German G55/II included the DB603 engine, five 20 mm guns and a pressurized cockpit. The suggestion of weapons in the wings, limited to one 20 mm gun for each wing, originated the final configuration of the Serie I, while the 603 engine was succesfully installed in the G56 prototypes.

As a concrete results of the German interest in the G55, the Luftwaffe acquired three complete G55 Sottoserie 0 airframes (MM91064-65-66) for evaluations and experiments giving in change three DB603 engines and original machinery for the setup of other production lines of the DB605/RA1050 RC58 I. Two of the Luftwaffe G55's remained in Turin, at the Aeritalia plants, where they were used by German and Italian engineers to study the planned modifications and the possible optimizations to the production process. Later these two were converted to Serie I and delivered to the ANR. The third one was transferred to Rechlin for tests and experiments in Germany. The DB603 engines were used to build the G56 prototypes.

The interest in the G55 program was still high after the Armistice: in October 1943 Kurt Tank, who previously personally tested a G55 in Rechlin, was in Turin to discuss about the G55 production. However, war events and the not yet optimized production process were the reasons for which the G55 program was eventually abandoned by the Luftwaffe. Early produced G55's required about 15000 manhours; while there were estimations to reduce the effort to about 9000 manhours, the German factories were able to assemble a Bf109 in only 5000 manhours.