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Propulsion QDR 3

Team 1 October 17, 2006. Propulsion QDR 3. Propulsion System Design Method. Goal: Design a single propulsion system capable of performing the design mission (one prop, one gearbox, one battery system). Undesirable to require two propellers to complete design mission

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Propulsion QDR 3

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  1. Team 1 October 17, 2006 Propulsion QDR 3

  2. Propulsion System Design Method • Goal: Design a single propulsion system capable of performing the design mission (one prop, one gearbox, one battery system). • Undesirable to require two propellers to complete design mission • Superior marketability of multi-functional aircraft • Method: 1) Determine propeller diameter and pitch for dash RPM < 10,000 2) Size propulsion system to meet dash requirements 2a) Select batteries to supply maximum power at minimum cost 2b) Find a cost-efficient gearbox with high gear ratio for 480 class motor 2c) Select motor with correct Kv that can handle the necessary current 3) Ensure that loiter requirement can be met with dash-optimized system 3a) Calculate energy available with dash-sized battery 3b) Loiter = 500 ft radius circular flight path 40 ft/s air speed 3c) Determine flight time (must be > 7 minutes) AAE 451 Team 1

  3. Propulsion System Max Speed (battery current limited) 117.7 ft/s ~ 80.3 mph • Propeller • APC (LP11011) 11x11 - 60 Pattern Propeller ($7.95) • Gearbox & Mounting Hardware • MP Jet (MP8104) 4.1:1 Gearbox for 480 Size ($19.90) • MP Jet (MJ8030) Short Prop Adapter for APC Props ($4.60) • MP Jet (MJ7250) 2" Black Lightweight Spinner ($3.20) • Motor • MEGA ACn 16/25/3 ($84.00) • Speed Controller • JETI Spin 44 ($137.95) • Batteries (in series) • 2 x Apogee 3-Cell 11.1 V 1200mAh 20C LiPo (2 x $25.00) • Total Propulsion Chargeable Cost = $169.65 (neglects speed controller) AAE 451 Team 1

  4. Motor/Battery Loiter Performance • Loiter (Main_System_Design - Modified) • Estimated Loiter Time: 20.7 mins (nearly 3X requirement) • Motor Voltage input: 9.68 V • Motor Current input: 7.97 A • Motor RPM: 16,200 RPM • Motor h: 75.1% Stall Preq > Pavail Loiter mission is steady turn at a 500 ft radius. Aircraft Constants: CD0 = 0.025 e = 0.75 AR = 5.6 W = 5 lb S = 4.16 ft2 (40,0.03) AAE 451 Team 1

  5. Motor/Battery Dash Performance • Dash (Main_System_Design - Modified) • Motor Voltage input: 20.9 V • Motor Current input: 24.0 A* (Motor Max Continuous 30 A) • Motor RPM: 34,900 RPM (Motor Maximum 55,000 RPM) • Motor h: 90.3% • Mtip,prop = 0.38 Vmax = 118.4 ft/s Gear Ratio = 4.015 Actual Gear Ratio: 4.1 Actual Vmax = 117.7 ft/s * Max battery continuous output 24 A Stall Preq > Pavail (117,0.37) AAE 451 Team 1

  6. Dash System Performance h=98% h=90% 502 W 0.67 hp 513 W 0.69 hp h=94% h=65% 278 W 0.37 hp 1.74 lbf 426 W 0.57 hp 454 W 0.61 hp Propeller power required increased by 1/0.75=33.3% per guidance from gold.m file. AAE 451 Team 1

  7. Summary • No need for multiple propulsion systems • Battery required for dash exceeds loiter requirements • Speed controller powers servos → no separate battery • Zero control power for trim at high speed is important AAE 451 Team 1

  8. Questions?? AAE 451 Team 1

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