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Propulsion PDR #1 AAE451 – Team 3 October 7, 2003

Propulsion PDR #1 AAE451 – Team 3 October 7, 2003. Brian Chesko Brian Hronchek Ted Light Doug Mousseau Brent Robbins Emil Tchilian. Method for Propulsion Selection. Use constraint diagram and engine database to pick engine With given engine, find RPM range

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Propulsion PDR #1 AAE451 – Team 3 October 7, 2003

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  1. Propulsion PDR #1 AAE451 – Team 3 October 7, 2003 Brian Chesko Brian Hronchek Ted Light Doug Mousseau Brent Robbins Emil Tchilian

  2. Method for Propulsion Selection • Use constraint diagram and engine database to pick engine • With given engine, find RPM range • Use gold.m in a loop to make plots • Pick pitch and diameter from gold.m results • Select available prop

  3. Constraint Diagram

  4. Engine Database

  5. O.S. Max 1.40 RX-FI $999.99 w/o muffler 3.5 BHP 1,800-10,000 RPM 1.78 lbs O.S. Max 1.60 FX $269.99 w/muffler 3.7 BHP 1,800-10,000 RPM 2.04 lbs Engine Comparison Ref. www.towerhobbies.com

  6. O/S Max 1.60 FX • Chosen for cheaper price and increased power with very small weight penalty • gold.m run at ~65% throttle (7,000 RPM) • Data sheet gives ~.44 gallons or ~2.6 lbs of fuel for a 30 minute flight Ref. www.towerhobbies.com

  7. HP vs J at 7000 RPM Note: Diameter and Pitch vary Required Horsepower J (1/rev)

  8. Efficiency vs J at RPM of 7000 Note: Diameter and Pitch vary hp J (1/rev)

  9. Cp vs J at Pitch of 9 inches Note: Diameter and RPM vary CP J (1/rev)

  10. Ct vs J at Pitch of 9 inches Note: Diameter and RPM vary CT J (1/rev)

  11. Efficiency vs J at Pitch of 9 inches Note: Diameter and RPM vary hp J (1/rev)

  12. Chosen Propeller • Based on carpet plots from gold.m: • RPM used = 7000 • Pitch is ~9 inches • Diameter is 20 inches • Efficiency ~0.48 • Ct~ 0.057 • Cp~0.029

  13. Chosen Propeller • Based on gold.m: • Thrust = 14lbs (per gold.m) • Tip speed check: • Tip Speed = • Tip Speed = 610 ft/sec

  14. Closest Available Propeller • Zinger 20x8 Wood Pusher Propeller • 20 inches in diameter with 8 inch pitch • Closest to 20x9 available • $25.99 from Tower Hobbies Ref. www.towerhobbies.com

  15. Summary of Results • O.S. Max 1.60 FX engine chosen: • 3.7 bhp • Uses ~2.6lbs of fuel for 30 minute flight • Zinger 20x8 Wood Pusher Propeller: • 20 inches in diameter with 8 inch pitch • Efficiency ~0.48 at 7,000 RPM

  16. Questions?

  17. Reasonability Check • Bootstrap approach taken by Dr. Lowry • parametric performance method Ref. http://www.allstar.fiu.edu/aero/BA-Background.htm

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