Points on body: pb = no. of points on the body
Points on wing: pw = no. of points on one wing piece
Points on tail: pt = no. of points on one tail piece
Number of Passengers: P = number of points on body * 3
Weight of airplane: wa = total no. of points (pb + pwtc) * 100
Weight of passengers: wp = P * 60 (assuming 60kg/passenger)
Total weight: (W) = weight of airplane (wa) + weight of passengers (wp)