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Patrick Dempsey Bridget Fitzpatrick Heather Garber Keith Hout Jong Soo Mok

ORION AEROSPACE. Propulsion Preliminary Design Review #2 October 17, 2000. Patrick Dempsey Bridget Fitzpatrick Heather Garber Keith Hout Jong Soo Mok. ORION AEROSPACE. Motor Evaluation. -Minimum required values to complete the mission Power = 125W Thrust at climb = 3.36 lbf

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Patrick Dempsey Bridget Fitzpatrick Heather Garber Keith Hout Jong Soo Mok

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  1. ORION AEROSPACE Propulsion Preliminary Design Review #2 October 17, 2000 Patrick Dempsey Bridget Fitzpatrick Heather Garber Keith Hout Jong Soo Mok

  2. ORION AEROSPACE Motor Evaluation -Minimum required values to complete the mission Power = 125W Thrust at climb = 3.36 lbf Thrust at turn = 2.80 lbf -Run motor test code using the motor constants supplied by the manufacturer.

  3. ORION AEROSPACE Motor code -Values input into the code For Motor Vin = voltage * cell # Motor constants – Kt, Kv, Rm, Io Inet = Iin-Io Pin= Vin*Iin Tout=Kt*Inet Pout=Inet*(Vin-Iin*Rm) RPM= Kv*(Vin-Iin*Rm)

  4. ORION AEROSPACE Motor Code Eta=Pout/Pin Istall = Vin/Rm Imax= sqrt(Io^2*Istall) Etamax= ((Imax-Io)/Imax)^2 For Gearbox: given values-gear ratio (m), Etag RPMg=RPM/m Poutg= Pout/Etag For Speed Controller: given value-Resistance(R) Pd = Iin^2*R

  5. ORION AEROSPACE Motor code Pinsp =PoutB =Pin+Pd Poutsp=Pin Etasp= Poutsp/Pinsp -Choose the best motor based on Power output and Efficiency. -Select optimal condition

  6. ORION AEROSPACE

  7. ORION AEROSPACE

  8. ORION AEROSPACE

  9. ORION AEROSPACE Astro Cobalt 25 at 19.2 Volts

  10. ORION AEROSPACE Aveox 1415/1.5 at 19.2 Volts

  11. ORION AEROSPACE Aveox 1415/2 at 19.2 Volts

  12. ORION AEROSPACE Maxcim N32-13D at 19.2 Volts

  13. ORION AEROSPACE Maxcim N32-13Y at 19.2 Volts

  14. ORION AEROSPACE Motor Selection Motor : Maxcim N32-13Y Voltage : 19.2 V Current : 16 A Efficiency : 90.408% RPM : 25946.24 Pout : 277.7344W Tout: 14.3792 in-oz

  15. ORION AEROSPACE Gearbox and Speed Controller Selection Gearbox -Efficiency : 95% -Gear Ratio : 3.7 -Poutg : 263.8477A Speed Controller -Efficiency :99.29% -Resistance : 0.009 Ohms -Poutsp :307.2 W -Pinsp : 309.504W

  16. ORION AEROSPACE Propeller Analysis Tool : modified Gold script Method : Run at various diameters and pitches Match Power and Thrust Get value for J = V/nD, Cp, and Ct Calculate Power from Battery PB = Pr/(Etas*Etam*Etag*Etap) Calculate Energy required for Battery E = PB *t

  17. ORION AEROSPACE Propeller Analysis PB from Motor Code >= PB from Calculation Eest= PB*2min. + 3/4*PB*10min. <= E

  18. ORION AEROSPACE Propeller Selection and Power Matching Results from modified Gold Script

  19. ORION AEROSPACE Advance Ratio Versus Efficiency

  20. ORION AEROSPACE Advance Ratio Versus Cp and Ct

  21. ORION AEROSPACE Propeller Selection and Power Matching Propeller : 14” Diameter and 10” Pitch PB Calculation(Gold) = 278.77 W PB from Code (Motor Code) = 309. 504W Endurance time =12 min. E= 3345.12 W-min. Eest = 2648.315 W-min.

  22. ORION AEROSPACE Questions?

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