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Propulsion PDR 2 Team Boiler Xpress

Join the PDR 2 Team as they discuss motor selection, gearbox and battery choices, and important aircraft dynamics for efficient propulsion system design. Discover how larger propellers at lower RPMs can enhance efficiency and explore the selection of specialized electric flight propellers. With detailed insights on system efficiencies and power loading constraints, this presentation offers valuable guidance on achieving optimal performance for electric aircraft propulsion systems.

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Propulsion PDR 2 Team Boiler Xpress

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  1. Propulsion PDR 2 Team Boiler Xpress Michael VanMeter Oneeb Bhutta Matthew Basiletti Ryan Beech October 17, 2000

  2. Topics of Discussion • Motor Selection • Pusher propeller considerations • Gearbox Selection • Propeller Selection • Bigger is better • Pusher propeller considerations • Battery Selection

  3. Aircraft Dynamics • Power loading constraint W/P = 0.2 lb-s/lb-ft P = 45 ft-lb/s = 0.08 hp

  4. System Efficiencies • Propeller (50%) • Historical data • Gearbox (90%) • Conservative side of historical values • Required motor power output P = 100 ft-lb/s = 0.18 hp = 135.6 W

  5. Motor Selection • Excess power (margin of safety) • 47.5% margin • Equivalent to a constraint of 10 degree climb angle • Resulting power requirement for motor P = 200 W • Adjustable timing for motor reversal due to pusher propeller

  6. Model Electronics CorporationTurbo 10 GT • Large gear ratio range • 2.0:1 through 9.6:1 • High endurance properties • Adjustable timing • Reversible • Economical • $65.00 for motor • $55.00 for gearbox • Uses standard speed controller

  7. Bigger is better Larger diameter Lower RPM Would like to test several size propellers with wind tunnel setup Investigating specialized electric flight propellers (shown right) Propeller Selection

  8. Larger Propeller spinning at a lower RPMs generally gives higher efficiency Expected gear ratio 6:1 or 7:1 With 14” to 18” propeller Gearbox Selection

  9. Battery Selection • Cells • 10 – 1.2Volt/cell • 1700 – 2000 mAh • Total endurance • Will meet endurance requirement t = 13.43 min

  10. Thank You Questions?

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