TAH author Ugo Vicenzi’s 3D computer modelling two precise externally-accurate replicas of Isotta Fraschini Asso 750 engines to be machined from urethane resin by Northern Italy-based firm Plyform Composites for the Savoia Marchetti Historical Group’s S.55X flying-boat replica. They are seen here with Plyform’s Gabriele Caccia.

Iranian Boeing 747-131F EP-NHJ/5-8101, a former TWA aircraft, in the cargo area at London Heathrow airport on December 15, 1984.

Junkers Ju 87G-2 Stuka WNr 494110, wearing fighter-style fuselage markings, is seen here after being deliberately groundlooped by Oberst Hans-Ulrich Rudel in May 1945.

The Aero A.101 biplane bomber, an enlarged and re-engined development of the A.100, was powered by a licence-built CKD Praga Asso 800 RV.

Onlookers - one of whom is Ing Cattaneo jr - watch one of the two Aero A.42 monoplane bomber prototypes during construction in Prague. Both were fitted with original Isotta Fraschini Asso engines.