1. 1 Design Group 2 Kat Donovan - Team Leader Andrew DeBerry Mike Kinder John Mack Jeff Newcamp Andrew Prisbell Nick Schumacher Conceptual Design for AME 441 Spring 2004

2. 2 Group 2 – Ducted Design

3. 3 Overview  Aircraft Configuration & Design Drivers  Comparison Aircraft  CAD Models  Spreadsheet Decisions ♣Airfoil Choice ♣Engine Selection ♣Weight & Drag Estimates ♣Static Stability  Conclusions & Lessons Learned  Design & Build Schedule

4. 4 Aircraft Configuration (Requirements)  Powered by electric motor  Carry specified payload  Take-off in < 300 feet on grass  Planform area between 400 in 2 & 800 in 2  Radio control system with up to 7 channels Design Drivers  Maximize the climb rate  Maximize the level flight speed

5. 5 Comparison Aircraft * Information from http://www.aerospaceweb.org/aircraft/bomber/yb49/ † Information from http://www.aerospaceweb.org/aircraft/bomber/b2/ ‡ Information from Design and Construction of a Remote Piloted Flying Wing, May 2, 1994

6. 6 CAD Models Electronics BoxBattery Pack (x2)Circuit Card ServoGPS ReceiverModem

7. 7 CAD Models - Dimensions

8. 8  NACA 6412 ♣Low Reynolds Number airfoil ♣t/c ratio large enough to house internal electronics Airfoil Choice

9. 9 Sample Lift Estimation http://www.grc.nasa.gov/WWW/K-12/airplane/foil2.html

10. 10 Engine Selection: Astro Cobalt 15 Model No.p/n 615G Name05 Geared Gear Ratio2.38 to 1 Armature Winding7 turns Armature Resistance0.069 ohms Magnet TypeSm Cobalt BearingsBall Bearings Motor Speed1488 rpm/volt Geared Motor Speed652 rpm/volt Motor Torque/amp0.91 in-oz /amp Geared Torque2.17 in-oz /amp Voltage Range8 to 12 volts No Load Currrent2 amps Maximum Continuous Current25 amps Maximum Continuous Power400 watts Gear Motor Length3.3 inches Motor Diameter1.3 inches Motor Shaft Diameter5/32 inch Prop Shaft Diameter1/4 inch Gear Motor Weight9 oz Data from www.astroflight.com  Electric, brushless motor  Runs off 16-cell rechargeable battery pack

11. 11 Power Estimate

12. 12 Thrust Estimates

13. 13 Thrust, Drag, Estimates

14. 14 Weight & Drag Estimates Structure3.84 Landing Gear0.6 Engine (Cobalt 15)0.56 Propeller0.06 Servo (x4)0.32 Receiver & Battery0.25 GPS & Transmitter0.5 Electronics Box1.5 Speed Controller0.08 Main Battery0.65 Total:8.36 Aircraft Weights (lbs)

15. 15 Static Stability Fuselage Length L (f)2 Wing Center of Lift L_ctr (x/L)0.4615388.307692 m.a.c. (ft)0.972.910884

16. 16 Conclusions & Lessons Learned  Flying wing to maximize rate of climb and level cruise speed  Ducted fan to increase propeller efficiency  Winglets to reduce drag  Tricycle landing wheels to prevent damage during landing  At least 24” separation of modem and GPS to limit interference

17. 17 Design & Build Schedule 26 February: Present Detailed Design 4 March: Complete Parts List 16 March: Fabrication 6-9 April: Ground Tests 13-22 April: Flight Tests

18. 18 Group 2: Nick Schumacher Andrew DeBerry Andrew Prisbell Jeff Newcamp Kat Donovan Mike Kinder John Mack Questions?