12/11/12 Brandon Campbell & Ernesto Chairez

Purpose  Civil Transport  Large Volume  Efficient  Quiet  Long Range

Mission Profile  Engine Start/Warm Up  Taxi  Takeoff  Climb  Cruise  Loiter  Descent  Land/Taxi

Mission Specs  Range : 8,000 nm  Cruise Vel. : 505 kts  Cruise alt. : 40,000 ft  Service Ceiling : 45,000 ft  Climb Rate: 2,500 fpm  Takeoff runway: 7,000 sea level  Passengers : 750  Pilots: 4 Pilots  Crew: 30 flight attendants

How is it more efficient?  Blended Wing Body (BWB) No “fuselage” High L/D  Disadvantages Internal layout Lack of windows Negative pitching moment [?]

Design Challenges  How do you correct the inherently negative pitching moment? Drooped ailerons  In AAA 2 sets of files ○ With aileron control surfaces ○ With aileron lift surfaces [?]

Constraint Curve

Design Points PointThrust (lbs.)Thrust-to-WeightWing Area (ft^2)Wing loading (lb/ft^2) 1271, , , , , , Design Point 2 Was Chosen

Airplane Characteristics  Length: 72 ft  Wingspan: ft  Takeoff Weight: 889,416.9 lb  Aspect Ratio: 8.5  Wing Airfoil Thickness: 16.5 ft (Supercritical airfoil) Inclination: 0 deg Dihedral : 0 deg Twist : 0 deg ¼ Chord : 19.4 deg Mean Geometric Chord: ft

Wing Layout

Side View

Front View

Cockpit Layout

Aircraft 3-View

Engines  CF680E1A3 (x4) lb thrust (ea) lb (ea) c j lb/lb-hr 8.75 ft diam. X 15 ft long

Galleys and Lavatories  Galleys (x2) 2357 lb (ea) 58.4 sq. ft (ea)  Lavatories (x16) 3.3 ft x 3.3 ft sq. ft (ea)

Control Surfaces  Split ailerons Like B-2 Spirit AAA does this via matching spoiler ○ Regular Aileron ○ Spoiler placed above Aileron

Landing Gear  Nose Gear (x1) 2 Wheels 18 in (w) x (48) (diam.) Press. 200 psi  Main Gear (x4) 4 Wheels 18 in (w) x 50 in (diam.) Press. 200 psi

AirAwesome cg Shift  Symmetry about x-axis  Fully loaded X cg shift ft Corresponding Z cg shift ft  Large cg shift outside normal range AirAwesome: in Civil transport average [3] : in  Mean geometric cord fraction AirAwesome: Civil transport average [3] :

References  [1]  [2]  [3] Airplane Design, Part II: Preliminary Configuration Design and Integration of the Propulsion System, Dr. Jan Roskam, 2004  [?]  [?] phantom/images/Mvc-014s.jpg (drooped aileron)

Questions?

Backup Slides

Cranked Wing

Weight Estimates