dAlu = 2.7;
dPlast = 1;
dSteel = 8;
alu = 8656/1000;
steel = 88698/1000;
plast = (317006.85+1730249.5+6541.3)/1000;
motors = 4*240;

mass = dAlu*alu + dPlast*plast + dSteel*steel + motors