The overall performance of the Hs 123 V1 prototype prematurely eliminated any chance for the more conventional Fi 98, which was cancelled after a sole prototype had been constructed. During testing, the Hs 123 proved capable of pulling out of "near-vertical" dives; however, two prototypes subsequently crashed due to structural failures in the wings that occurred when the aircraft were tested in high-speed dives. The fourth prototype incorporated improvements to cure these problems; principally, stronger centre-section struts were fitted. After it had been successfully tested, the Hs 123 was ordered into production with a 656 kW (880 hp) BMW 132Dc engine.