To muddy the waters, there's the squared and cubed scale factor.
Thus a half scale a/c has 1/2 length, span etc., but only 1/4 the area and 1/8 the mass.
In practical terms e.g. a 2/3 "Spitfire" replica has 4/9 (44%) wing area but merely 8/27 (30%) the weight of the real thing, all other things being equal.
Different construction materials, and a full size 1:1 space for the P1 make more differences when comparing "the same" shape with the original a/c.
mike hallam