1. Propulsion Preliminary Design Review #1
ORION AEROSPACE
Propulsion Preliminary Design Review #1
September 28, 2000
Patrick Dempsey
Bridget Fitzpatrick
Heather Garber
Keith Hout
Jong Soo Mok

2. Sample from propeller database
ORION AEROSPACE
Propeller
Look at past team propellers
Compile database (web, reports, handouts)
Estimate a range of propellers that meet the power requirement calculated by sizing code
Sample from propeller database

3. Aerodynamics Gather data from internet
ORION AEROSPACE
Aerodynamics
Gather data from internet
Measure propeller characteristics
Create CFD model of propeller
Test candidate propellers

4. Electric Motor Create motor database
ORION AEROSPACE
Electric Motor
Create motor database
Use database in sizing code to calculate a motor input power required
Compare possible motors using code (results follow)
Choose motor based on power, efficiency, and future value to the course
-Motor chosen - MaxCim MaxN32–13Y
-Input power – W
-Uses 7-25 cells
-Ability to choose from a wide variety of gear ratios

5. Power versus current plot from motor code
ORION AEROSPACE
Electric Motor
Power versus current plot from motor code

6. Gearbox -Choose gearbox ratio based on -Propeller characteristics
ORION AEROSPACE
Gearbox
-Choose gearbox ratio based on
-Propeller characteristics
-Number of cells indicated from sizing code
-Motor power curve

7. Motor power curve from MaxCim website
ORION AEROSPACE
Motor Power Curve
Motor power curve from MaxCim website

8. Speed controller -Chose ESC based on -Motor used -Cells used
ORION AEROSPACE
Speed controller
-Chose ESC based on
-Motor used
-Cells used
-Efficiency
-MaxCim Maxµ35B-21
-7-21 cells
-0.009 on resistance
-Runs cool at partial throttle

9. Battery Cells and capacity selected based on sizing code calculations
ORION AEROSPACE
Battery
Cells and capacity selected based on sizing code calculations
Use sizing code to calculate
Watts required by motor
Energy consumed during mission
mAh cells

10. ORION AEROSPACE
Questions?