3.1 Foreword....... 26 3.1.1 Noise. 26 3.1.2Drag… 26 3.2 Fuselage.… 26 3.3 Nose... 27 3.4Wing.… 28 3.4.1 Wing platform design 28 3.4.2 Airfoil .30 3.5 Tails.. 31 3.5.1 Horizontal tail. 31 3.5.2 Vertical tail. 31 3.6 Engine Position… .. 32 3.7 Area Rule Design.… 32 3.8 Aerodynamics Force Calculation. 34 3.8.1 Low speed characteristics.... 34 3.8.2 High speed characteristics. 37 4 STRUCTURAL DESIGN.................. 40 4.1 Structural Load................ 40 4.1.1 Main load.… 40 4.1.2 Typical flight attitude and loading coefficient 40 4.1.3 Complex loading situation..... 42 4.2 Structural Criteria.... 44 4.2.1 Common Criteria.............. 44 4.2.2 Peculiar Criteria. 45 4.2.3 Environmental Conditions. 45 5 REFINED WEIGHT..... 46 5.1 Fuselage group 46 5.2 Wing group. 46 5.3 Tail Group.… 47 5.4 Power plant....... 473 3.1 Foreword ............................................................................................................26 3.1.1 Noise............................................................................................................26 3.1.2 Drag .............................................................................................................26 3.2 Fuselage..............................................................................................................26 3.3 Nose....................................................................................................................27 3.4 Wing...................................................................................................................28 3.4.1 Wing platform design. .................................................................................28 3.4.2 Airfoil ..........................................................................................................30 3.5 Tails....................................................................................................................31 3.5.1 Horizontal tail..............................................................................................31 3.5.2 Vertical tail ..................................................................................................31 3.6 Engine Position ..................................................................................................32 3.7 Area Rule Design ...............................................................................................32 3.8 Aerodynamics Force Calculation.......................................................................34 3.8.1 Low speed characteristics............................................................................34 3.8.2 High speed characteristics. ..........................................................................37 4 STRUCTURAL DESIGN.........................................................................................40 4.1 Structural Load...................................................................................................40 4.1.1 Main load.....................................................................................................40 4.1.2 Typical flight attitude and loading coefficient ............................................40 4.1.3 Complex loading situation...........................................................................42 4.2 Structural Criteria...............................................................................................44 4.2.1 Common Criteria .........................................................................................44 4.2.2 Peculiar Criteria...........................................................................................45 4.2.3 Environmental Conditions...........................................................................45 5 REFINED WEIGHT.................................................................................................46 5.1 Fuselage group ...................................................................................................46 5.2 Wing group.........................................................................................................46 5.3 Tail Group ..........................................................................................................47 5.4 Power plant.........................................................................................................47