One of the most tangible pieces of production drama on High Road to China involved the film's aircraft — a central element in a movie built around an aerial race. Early in prep, builder Vernon Ohmert of Ypsilanti, Michigan constructed replicas of the World War I Bristol F2B fighters to match the novel's hardware. After the replicas were finished, the production concluded they were unsafe to operate at the kinds of altitudes and flight profiles the shoot required. Rather than risk performing hazardous aerial work with bespoke replicas, the production replaced them with two Stampe SV-4 biplanes (registered G-AZGC and G-AZGE) provided by Bianchi Aviation Film Services. The swap is well documented in production accounts: the dangerous replicas were sidelined rather than flown, and the Stampe planes were used for the aerial sequences shot on location in Yugoslavia (Opatija, Istria and nearby Kamenjak near Rijeka) and elsewhere. No publicized crashes or injuries resulted from the decision, but the episode stands as a reminder of how precarious stunt aviation could be in the pre-digital era — and how quickly a period production could be forced to alter its equipment to avoid a potential catastrophe.
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