Group 2 conceptual

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Group 2 conceptual

  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 <ul><ul><li>Aircraft Configuration & Design Drivers </li></ul></ul><ul><ul><li>Comparison Aircraft </li></ul></ul><ul><ul><li>CAD Models </li></ul></ul><ul><ul><li>Spreadsheet Decisions </li></ul></ul><ul><ul><ul><li>Airfoil Choice </li></ul></ul></ul><ul><ul><ul><li>Engine Selection </li></ul></ul></ul><ul><ul><ul><li>Weight & Drag Estimates </li></ul></ul></ul><ul><ul><ul><li>Static Stability </li></ul></ul></ul><ul><ul><li>Conclusions & Lessons Learned </li></ul></ul><ul><ul><li>Design & Build Schedule </li></ul></ul>
  4. 4. Aircraft Configuration (Requirements) <ul><ul><li>Powered by electric motor </li></ul></ul><ul><ul><li>Carry specified payload </li></ul></ul><ul><ul><li>Take-off in < 300 feet on grass </li></ul></ul><ul><ul><li>Planform area between 400 in 2 & 800 in 2 </li></ul></ul><ul><ul><li>Radio control system with up to 7 channels </li></ul></ul>Design Drivers <ul><ul><li>Maximize the climb rate </li></ul></ul><ul><ul><li>Maximize the level flight speed </li></ul></ul>
  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 Box Battery Pack (x2) Circuit Card Servo GPS Receiver Modem
  7. 7. CAD Models - Dimensions
  8. 8. <ul><ul><li>NACA 6412 </li></ul></ul><ul><ul><ul><li>Low Reynolds Number airfoil </li></ul></ul></ul><ul><ul><ul><li>t/c ratio large enough to house internal electronics </li></ul></ul></ul>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 9 oz Gear Motor Weight Data from www.astroflight.com 1/4 inch Prop Shaft Diameter 5/32 inch Motor Shaft Diameter 1.3 inches Motor Diameter 3.3 inches Gear Motor Length 400 watts Maximum Continuous Power 25 amps Maximum Continuous Current 2 amps No Load Currrent 8 to 12 volts Voltage Range 2.17 in-oz /amp Geared Torque 0.91 in-oz /amp Motor Torque/amp 652 rpm/volt Geared Motor Speed 1488 rpm/volt Motor Speed Ball Bearings Bearings Sm Cobalt Magnet Type 0.069 ohms Armature Resistance 7 turns Armature Winding 2.38 to 1 Gear Ratio 05 Geared Name p/n 615G Model No. <ul><ul><li>Electric, brushless motor </li></ul></ul><ul><ul><li>Runs off 16-cell rechargeable battery pack </li></ul></ul>
  11. 11. Power Estimate
  12. 12. Thrust Estimates
  13. 13. Thrust, Drag, Estimates
  14. 14. Weight & Drag Estimates 8.36 Total: 0.65 Main Battery 0.08 Speed Controller 1.5 Electronics Box 0.5 GPS & Transmitter 0.25 Receiver & Battery 0.32 Servo (x4) 0.06 Propeller 0.56 Engine (Cobalt 15) 0.6 Landing Gear 3.84 Structure Aircraft Weights (lbs)
  15. 15. Static Stability 2.910884 0.97 m.a.c. (ft) 8.307692 0.461538 L_ctr (x/L) Wing Center of Lift 2 L (f) Fuselage Length
  16. 16. Conclusions & Lessons Learned <ul><ul><li>Flying wing to maximize rate of climb and level cruise speed </li></ul></ul><ul><ul><li>Ducted fan to increase propeller efficiency </li></ul></ul><ul><ul><li>Winglets to reduce drag </li></ul></ul><ul><ul><li>Tricycle landing wheels to prevent damage during landing </li></ul></ul><ul><ul><li>At least 24” separation of modem and GPS to limit interference </li></ul></ul>
  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. Questions? Group 2: Nick Schumacher Andrew DeBerry Andrew Prisbell Jeff Newcamp Kat Donovan Mike Kinder John Mack

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