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Method for Propulsion Selection Using Constraint Diagram and Engine Database

Learn to choose the right engine for optimal performance by utilizing a constraint diagram and engine database. Select propeller pitch and diameter for efficiency and power. Detailed comparison and analysis provided.

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Method for Propulsion Selection Using Constraint Diagram and Engine Database

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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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