1. Aether Aerospace AAE 451 September 19, 2006
Propulsion PDR 1
Aether Aerospace
AAE 451
September 19, 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: Propeller Subsystem
Phase 3: Gearbox and Motor Subsystems
Phase 4: Battery Subsystem
Optimization
February 17, 2019
AAE 451, Aether Aerospace

3. Phase 1: Aircraft Subsystem
February 17, 2019
AAE 451, Aether Aerospace

4. Phase 2: Propeller Subsystem
Important Needed Propeller Parameters
Pitch to Diameter Ratio: τ=p/D
Thrust Coefficient: CT
Power Coefficient: CP
Advance Ratio: J=V/(nD)
V – airspeed (ft/s)
n – propeller frequency (hz)
D – propeller diameter (ft)
February 17, 2019
AAE 451, Aether Aerospace

5. Phase 2: Propeller Subsystem
CT, CP, and J vary with τ
Empirical data in propulsion sourcebook
February 17, 2019
AAE 451, Aether Aerospace

6. Phase 2: Propeller Subsystem
Data is plotted in constant β lines
β is the prop. blade angle at 0.75R
p=2πr*tan(β)
τ=0.75π*tan(β)
February 17, 2019
AAE 451, Aether Aerospace

7. Phase 2: Propeller Subsystem
Now CT, CP, and J can be entered into Matlab code for a range of τ
Data may be obtained from gold.m?
Perform trade study for propeller diameter
Determine max prop diameter
February 17, 2019
AAE 451, Aether Aerospace

8. Phase 3: Gearbox and Motor
Need to select a few motors
Utilized Motocalc’s huge motor database
Motor only!
MotoCalc Suggestions
Motor
Battery
Gear
Prop
Rating
Price
Mega ACn
12x3200SHD
3.5:1
12x6 1
$104.99
Plettenberg HP 370/20/A2 S
3:1
0.998
$299.00
Neu 1515/2Y-1100
11x3200SHD
0.996
$280.00
Medusa Research
4:1
12x7
$99.95
Kontronik Tango (12V)
0.995
$283.00
Aveox 27/39/2
10x3200SHD
4:01
0.994
$269.95
Neu 1509/1.5Y-2400
6x3200SHD 2P
$195.00
Hacker B50 13XL
$269.99
February 17, 2019
AAE 451, Aether Aerospace

9. Phase 3: Gearbox and Motor
Reduced options to cheapest manufacturers
Asked Motocalc for motors from Mega and Medusa Research
Less Expensive Motors
Motor
Battery
Gear
Prop
Rating
Price
Mega ACn
12x3200SHD
3.5:1
12x6 1
$104.99
Mega AC 22/30/3
11x3200SHD
0.991
$129.99
Mega ACn
9x3200SHD
4:1
0.987
Medusa Research
12x7
$99.95
Medusa Research
2.5:1
0.998
Medusa Research
5x3200SHD 2P
0.993
February 17, 2019
AAE 451, Aether Aerospace

10. Phase 3: Gearbox and Motor
These motors are underpowered
Low top speed ~ 100 ft/sec
Motocalc inputs are inexact
For example: Which of these does your airfoil look like?
Change Motocalc inputs to gain acceptable top speed from motors from Mega and Medusa.
February 17, 2019
AAE 451, Aether Aerospace

11. Phase 3: Gearbox and Motor
Motor Selection
Must choose a motor that will satisfy the power requirement of the desired top speed.
Utilize Matlab code to determine overall propulsion system with greatest efficiency
February 17, 2019
AAE 451, Aether Aerospace

12. Phase 4: Battery
Determine energy required for different mission components
Compare batteries
Cell Type
Volts
mA*hr/cell g
Energy (J)
Energy/m (J/g)
NiCad
1.2
1000 14
4320
308.6
NiMH
800
3456
246.9
Lithium Polymer
3.7
1500 36
19980
555.0
February 17, 2019
AAE 451, Aether Aerospace

13. Optimization What needs to be done:
Input CT, CP, and J values for a range of τ
Create motor database with required motor parameters
Loop Matlab code to determine the velocity, propeller, gear box, motor, and battery that produces the largest overall efficiency
February 17, 2019
AAE 451, Aether Aerospace

14. Optimization
Revisit mission analysis and constraint diagram with the updated motor, drag, and flight condition information
Repeat as needed
February 17, 2019
AAE 451, Aether Aerospace

15. Questions?????????
February 17, 2019
AAE 451, Aether Aerospace