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Propulsion QDR: Engine and Propeller Selection for Optimal Performance

Explore the detailed process of selecting an engine and propeller for maximum efficiency and performance in cruise conditions. Learn about the constraints, preliminary choices, propeller sizing techniques, and efficiency considerations for a seamless propulsion system. Visit the provided links for in-depth information.

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Propulsion QDR: Engine and Propeller Selection for Optimal Performance

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  1. Propulsion QDR • Scott Bird • Mike Downes • Kelby Haase • Grant Hile • Cyrus Sigari • Sarah Umberger • Jen Watson Propulsion QDR

  2. Preview • Choice of Engine • Redesigning of Propeller • Manufactured Choice • Cruise Conditions Propulsion QDR

  3. Constraining Conditions • SHPconstraint = 4.08 • SHPdesign=5.0 Propulsion QDR

  4. Preliminary Choice for Engine • BME-50 • Power = 5.0 hp • RPM: 1200-9800 • Weight = 3.25 lbs. Propulsion QDR

  5. Propeller Sizing – Sizing for Take-Off • Take-Off Velocity • CLTO C http://www.danspropshop.com/pitch.html Propulsion QDR

  6. Propeller Sizing – Sizing for Take-Off • Lift and Drag @ .7*VTO • Thrust at Take-Off (Brandt et al p. 176) C http://www.danspropshop.com/pitch.html Propulsion QDR

  7. Propeller Sizing – Sizing for Take-Off • Used modified gold.m code • Varied Pitch and Propeller Diameter • Max RPM = 9800 • Velocity Ranged from 5 ft/s to 55 ft/s in 10 ft/s intervals http://www.danspropshop.com/pitch.html Propulsion QDR

  8. Propeller Sizing – Efficiency vs. Power Propulsion QDR

  9. Propeller Sizing – Sizing for Take-Off • With D=18 in., P=6 in. and VTO = 37.72 ft/s • Efficiency = 40 % C http://www.danspropshop.com/pitch.html Propulsion QDR

  10. Propeller Sizing – Manufactured Choice • Menz "Standard" 2-Blade Wood Props • 18X6 Propeller • $16.00 Propulsion QDR

  11. Propeller Sizing – Cruise Conditions • Used second modification of gold.m code • Held Pitch constant at 6 inches and Diameter constant at 18 inches • Assume Velocity = 50 ft/s • Varied RPM Propulsion QDR

  12. Cruise Conditions • Prop=18X6 • Max Efficiency at approx. 4200 RPM • J = .475/rev • CT = .0155 • CP = .01 • Efficiency = 75% Propulsion QDR

  13. Questions? • Questions?? Propulsion QDR

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