An engine can achieve an impressive performance figure while suffering damage that requires a major overhaul afterward. The Soviet aircraft examples distinguish a successful high-speed run from a power plant that can repeat it reliably in service. Metallurgy determines whether turbine components tolerate that use and remain reusable. Materials research therefore affects practical aircraft performance as much as the ability to produce a powerful engine in the first place.
Notable Point · 3:55:44-3:57:25
Turbine metallurgy and repeatable aircraft performance
A high-speed run says little about operational usefulness if it consumes the engine's remaining service life.