Because square-cube law.
Weight increases cubic to dimensions, while material cross section that gives the strenght to things only grows quadratic. So do many values. Many do square and many do cube up.
As a general rule, the bigger you go:
-the easier to achieve speeds, long ranges, big payload.
-The harder it is to achieve structural strenght, rigidity, agility, accelerations.
If you scale up a mosquito it won’t work. If you scale down an airliner it won’t work.
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