Patrick Dempsey Bridget Fitzpatrick Heather Garber Keith Hout Jong Soo Mok Preliminary Sizing PDR 26 September, 2000

Team Concept Biplane Configuration  Square Fuselage  Rectangular Wings  Conventional Swept Tail  Tail Dragger

Aircraft Specifications

Equipment Storage EquipmentVolume(in 3 ) Gear box 3 x 1.5 x 1 Motor2.25 x 1.5 Speed Controller1.5 x 1.25 x 1 Receiver 1.75 x 1.25 x 0.75 Gyro 1.5 x 1.25 x 1.25 Data Recorder 1.75 x 2.25 x 3.25 Battery(20) 2 x 1 x 1 Servo 1.5 x 1.25 x 0.75 Interface 1.25 x 3.5 x 5.75

Equipment Storage

Concept Description Biplane Pros: Cons:  Shorter Wing Span  Wing Interference Increase Turn Clearance  Accessibility of Equipment Increase Roll Rate Maneuverability Transporting  Less Need For High Lift Devices  Decalage Provides Natural Stall Recovery  Less Need For High Lift Devices  Induced Drag  Decalage Provides Natural Stall Recovery  Accessibility of Equipment Biplane Configuration Pros:Cons:

Concept Description Square Fuselage Pros:Cons:  Ease of Construction  Aerodynamics  Strong Bending  Weak Twisting  Equipment Storage Rectangular Wing  Ease of Construction  Aerodynamics

Concept Description Pros:Cons: Conventional Swept Tail  Stalls at High Angles of Attack  Construction Tail Dragging Landing Gear  No Extra Control System Necessary For Nose Gear

SIZING and WEIGHT ESTIMATION METHOD -Set motor weight and properties -Set flight parameters -Use historical data to calculate initial Wto -Iterate to obtain wing area and Wto -Use S and Wto to build drag model -Use drag model to evaluate energy (each stage) -Find new battery weight based on energy required -Re-iterate S and Wto until values converge

HISTORICAL DATABASES

Constraint Equation Endurance take derivative and set =0.

Constraint Equation Rate Of Climb

Constraint Equation Turning (Thrust)(Velocity)=Power

Constraint Equation V-Stall Lift~Weight

Constraint Equation Cruise

Constraint Equation Take Off

Constraint Diagram

Questions?