wingspan	160
M_cruise	0.8
M_landing	0.2
	
cLalpha_cruise	0.0571
cL0	0.1421
cMalpha_cruise	-0.0661
cM0	-0.2092
	
efficiency	0.8501
	
alt_cruise	35000
weight_cruise	160000
	
cd_correction	0
c_f	0.003