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Team 5 Vehicle Propulsion PDR 1

Team 5 Vehicle Propulsion PDR 1. Presented By: Maria Mullins Charles Reyzer James Roesch Nick White. Sizing Revisions. Weight Correct Implementation Constraint Plot Modifications Equations. Battery Weight Fraction Governing Equations.

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Team 5 Vehicle Propulsion PDR 1

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  1. Team 5Vehicle PropulsionPDR 1 Presented By: Maria Mullins Charles Reyzer James Roesch Nick White

  2. Sizing Revisions • Weight • Correct Implementation • Constraint Plot • Modifications • Equations AAE 451 – Team 5

  3. Battery Weight FractionGoverning Equations • Straight Flight • Turning Flight • Climb • Total Fraction AAE 451 – Team 5

  4. Weight Guessing • Inputs (DR&O) • Vstall = 20 ft/s • Vloiter = 28 ft/s • Wpay = 0.2 lbf (gyro) • ρE ~ 230000 J/lbf* • Flight Time: 15 min • Output • WTOT = 0.6 lbf *www.towerhobbies.com AAE 451 – Team 5

  5. Constraint EquationsUnderstood Thus Far • Climb • Stall • Take-Off AAE 451 – Team 5

  6. Constraint Plot • Wing Loading: • W/S = .38 lbf/ft2 • Power Loading: • W/Bhp = 26.9 lbf/Bhp AAE 451 – Team 5

  7. Weight Constraints • Current Weight • 0.8 ft Boom Separation Required • Propulsion Constraint • 0.917 ft propeller needed (11 in) • Proportions • 1 ft clearance  4.75 Span • WNEW = 2.75 lb AAE 451 – Team 5

  8. Problem Solving for Sizing • Re-map historical data • Widen Booms AAE 451 – Team 5

  9. Motor Selection - Brushed • Graupner Speed 500 7.2V Electric • Based on Aircraft Weight ~2.75 lbs • For Airplanes weighing up to 3.125 lbs • Cost: $16.90 AAE 451 – Team 5

  10. Graupner Speed 500 7.2V AAE 451 – Team 5

  11. Finding RPM’s • From Graupner website: RPM/V=2360 • Battery Voltage: 3.75V • 8850 RPM AAE 451 – Team 5

  12. Gear Box Selection • Graupner Speed Gear 500/600 • Gear Ratio: 2.8:1 • Weight: 0.0992 lbs • Cost: Unknown at this time AAE 451 – Team 5

  13. Speed Controller Selection • Tiny GWS 5 Amp Micro Speed Control • Weight: 0.011 lbs • Size: 0.0705 x 0.0344 x 0.0180 ft. • With Brake • Cost: $21.90 AAE 451 – Team 5

  14. Propeller Properties • Propeller Performance Data (gold.m) • Propeller Physical Data • Diameter = 11 inches • Pitch = 6 inches • Airfoil Sections • Hub: Eppler E 857 • Tip: Eppler E 852 • Twist = 26.34° AAE 451 – Team 5

  15. Cp and Ct plot from gold.m • Cp and CT get larger towards the tip of the propeller • Tip produces more power and thrust than hub AAE 451 – Team 5

  16. Propeller Airfoil Sections • Hub • Eppler E 857 • High Clmax favorable for hub sections AAE 451 – Team 5

  17. Propeller Airfoil Sections • Tip • Eppler E 852 • Thin • High Clmax at lower angles of attack AAE 451 – Team 5

  18. Hub Angle • Based on Velocity Triangles • Hub Radius 3/4” * • α for airfoil Clmax = 7° • Relative Velocity at 62.61° with horizontal flight • Twist hub at 55.62° to achieve Clmax at loiter β= 7° αrel= 55.62° Uhub = nR = 57.92 ft/s Vx = 30 ft/s αtot= 62.61° *Tower Hobbies Propeller estimation AAE 451 – Team 5

  19. Based on Velocity Triangles Tip Radius 5.5” α for airfoil Clmax = 4° Relative Velocity at 85.96° with horizontal flight Twist hub at 81.96° to achieve Clmax at loiter Tip Angle β= 4° αrel= 81.96° Uhub = nR = 424.77 ft/s Vx = 30 ft/s αtot= 85.96° AAE 451 – Team 5

  20. Actual RC Propeller Comparison Tip Hub Picture of 11x6 Pusher Prop http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LX1502&P=0 AAE 451 – Team 5

  21. Questions? AAE 451 – Team 5

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