1. Propulsion QDR AAE 451 Fall 2006 Team 4 Tung Tran Mark Koch
Matt Drodofsky Matt Lossmann
Ravi Patel Ki-bom Kim
Haris Md Ishak Andrew Martin

2. Overview Selection Process (propeller and motor)
Geometric Propeller properties
Motor Selection
Power Supplies
Cost Breakdown

3. Selection Process
Run 130ft/s to find propeller diameter
Run gold.m for various P/D’s and maximize efficiency
Using the equation J=V/(nD), the RPM’s of the motor can be found
Blade pitch is calculated
Cp is known and the power requirement can be calculated
Find a motor that can satisfy the power requirement

4. Propeller Geometries Chose a P/D of 0.8.
This is the highest value found in commercially built propellers
This yields an advance ratio of 0.9

5. Propeller Geometries τ = .8 V = 130 ft/s J = .9 N = 173.33 rps
Β = 57.85º
Where: Tau = P/D
R = propeller radius

6. Propeller Geometries From Raymer’s:
Helical Tip speed for wooden prop not to exceed 850ft/s

7. Motor Selection
We now know all the variables except Pin. Solving the equation above yields:

8. Motor Selection Rimfire 35-48-1000 outrunner brushless motor
Continuous Amps – 50A
Input Voltage – 11.1 – 14.8V
Weight – 6 oz
Kv – RPM/V
Price - $69.99

9. Battery Selection Team Orion Avionics SLPB 1250mAh 7.4V 2S-1P
2 batteries
4 cell total
14.8 volt total
Max discharge 72 amps
2500 mAh total
Weight – 5.8 oz
Price - $75.98 total

10. Speed Controller Castle Creations Phoenix-80 Brushless Motor Control
80A continuous power
BEC of 3A
Price - $135.99

11. Horsepower Calc

12. Max Flight Time

13. Cost Estimation Motor - $69.99 Speed Controller - $135.99
Batteries – $75.98
Propeller - $5
Total with Speed Controller – $286.96
Total without Speed Controller – $150.97

14. Questions?