What changes have been made to the replicas of the "Number 21" machine?
Modern engines and improvements to the structure and control systems
Original engines with improvements to the landing gear and wings
Use of traditional materials with modern design
Increase in the size and speed
Answer
To summarize, the replicas of the "Number 21" machine have been updated with contemporary engines and advancements in the structure and control mechanisms, resulting in enhanced performance and better overall functionality compared to the original design.
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