Wood and rope frame planes reach limit. Next generation of system emerges to replace original system. Metal frame monoplane Stage 6. Some limited use of original system may coexist with new system. A limited use of biplanes still exists 2 Uneven development of subsystems resulting in contradictions.
Subsystems have different life cycle curves.
Primitive subsystems held back development of total system. Common mistake is to focus on the improviement of wrong subsystem. Developers focused on engine power instead of improving poor safety in old cars 3 Increasing dynamism and controllability. Early automobiles were controlled by engine speed. Then manual gearbox, followed by automatic transmissions, and continuously variable transmissions.