1. Aether Aerospace AAE 451 October 3, 2006
Propulsion QDR 2
Aether Aerospace
AAE 451
October 3, 2006
Mark Davis Ashley Gordon
Hank Kneitz Ryan Mulligan
Joshua Rodewald Brandon Wampler
Mathieu Hautier Samantha Pearcy

2. Overview Phase 1: Aircraft Subsystem Phase 2: Battery Subsystem
Phase 3: Motor Subsystem
Phase 4: Propeller & Gearbox Subsystems
September 20, 2018
AAE 451, Aether Aerospace

3. Phase 1: Aircraft Subsystem
Revisit Constraint Analysis
with updated aircraft parameters
CL,max = 1.55
Cd0 = 0.032
L/Dmax ≈ 8
W/S = 1.65
P/S = 2.41
Power Required (at 150 ft/s) =
2.3 Bhp
September 20, 2018
AAE 451, Aether Aerospace

4. Phase 2: Battery Subsystem
$250 Budget
Propulsion System will be majority of cost
~$200-$210
Propeller ~ $10 (Tower Hobbies)
Motor ~ $70~$100 (Prop. PDR)
Gearbox ~ $20 (Mega)
BATTERY EST. PRICE ~ $80-$110
September 20, 2018
AAE 451, Aether Aerospace

5. Phase 2: Battery Subsystem
Battery Database:
Values average for over 70 batteries
LiPo’s most cost and weight efficient
Chose Polyquest cell battery pack
Energy Density (kJ/lb)
NiCad 48
NiMH 51
LiPo
750
J/$
NiCad
861
NiMH
819
LiPo
3,068
September 20, 2018
AAE 451, Aether Aerospace

6. “Hi-Po” cell
3 Cell 11.1V
4400 mAh
Discharges 53A and 70A
Size: 5-7/8x1-3/4x7/8”
Weight: 10.7 oz
Price: $103.90
September 20, 2018
AAE 451, Aether Aerospace

7. Phase 3: Motor Subsystem
Rimfire Kv
Kv = 1300 RPM/V
Kt = in*oz/amp
Rm ~ 0.03 Ohm (est.)
Io = 4.2
Price: $69.99
September 20, 2018
AAE 451, Aether Aerospace

8. Phase 3: Motor Subsytem RPM = Kv x (Vin-In x Rm) = 11700 RPM
Torque = Kt x (Iin – Io)
= 68.4 in*oz
Pout = Torque x RPM
= 0.79 hp
September 20, 2018
AAE 451, Aether Aerospace

9. Phase 4: Propeller and Gearbox Subsystems
Efficiencies
Prop & Gearbox Eff. ~ 0.8
Pout(Motor) ~ 1.25*Pnet
Net Power Out ~ 0.63 hp
Online Research:
Propeller ~ $10
Gearbox ~ $20
September 20, 2018
AAE 451, Aether Aerospace

10. Total System Cost Battery $103.90 Motor $ 69.99 Prop. $ 10.00
Gearbox $
Total $203.89
September 20, 2018
AAE 451, Aether Aerospace

11. New Top Speed Using Constraint Analysis and Varying Vmax:
September 20, 2018
AAE 451, Aether Aerospace

12. New Top Speed Solving the Curve-fit Equation:
Vmax = 60 ft/s
This number is dependent on the aerodynamic properties, but is more accurate than original goal
Revisit Aero Analysis
September 20, 2018
AAE 451, Aether Aerospace

13. Questions? The Angry Mosquito September 20, 2018
AAE 451, Aether Aerospace