1. SAE BAJA TEAM MEMBERS: CHAD CHANDLER JOE COFER NATHAN ERAMIAN
FRANCIS HAURIS
JEFF WONG

2. BACKGROUND Originated in USC in 1976 Competitions include: EVENT
POINTS
STATIC
300
Design Report 50
Design Evaluation
100
Cost Report 15
Production Cost 85
Presentation
DYNAMIC
700
Acceleration 75
Pulling
Maneuverability
Rock Crawl
Endurance
400
TOTAL
1000
Originated in USC in 1976
Run by SAE
Competitions include:
Dynamic Events
Static Events

3. RESEARCH PHASE STUDY OF PREVIOUS DESIGNS SAE RULES AND REGULATIONS
Suspension
Frame
Drive Train
SAE RULES AND REGULATIONS

4. PREVIOUS FRAME & SUSPENSION
PAST DESIGN
DISADVANTAGES
SIZE WEIGHT MATERIALS CONSTRUCTION

5. PREVIOUS DRIVE TRAIN CHAIN DOUBLE REDUCTION ADVANTAGES DISADVANTAGES
Inexpensive
DISADVANTAGES
Stretching
Failure
Exposed to elements
ADVANTAGES
Consistent
Reliable
DISADVANTAGES
Expensive
Bulky/Heavy

6. DESIGN PHASE CRITERION PRIORITY DESIGN REGIMENTS HANDLING ESSENTIAL
Unsprung to sprung optimization
Favorable weight distribution
Low CG
Congruent suspension kinematics
AGILITY
Great power to weight ratio
Efficient gear train
Low GVW
RELIABILITY
HIGH
CNC fabricated frame
Accurate FEA
MANUFACTURABILITY
DESIRED
Simplistic design
Less joints
Multipurpose beams

7. SUSPENSION DESIGN PROCESS
Lotus Suspension Analysis
Double Wishbone Front
Trailing Arm Rear
Testing Modes
Bump
Roll
Steer

8. SUSPENSION DESIGN PARAMETERS
Gross Vehicle Weight (GVW)
520 pounds
Weight Distribution Bias (F/R)
45/55
Center of Gravity Height
Low as possible
Lateral Track Width (F/R)
47/46 inches
Longitudinal Wheelbase
60 inches
Ride Height
10-12 inches
Tire Diameter
23 inches
Effective Tire Radius
11.38 inches
Static Camber Angle
~ 0 to -1 degrees
Static Caster Angle
~ 8 degrees
Scrub Radius
0.5 to 1 inches
Rack and Pinion Width
~ 10 inches
Toe Change in Travel
Minimal
Roll Axis Inclination
Neutral to Slight Oversteer

9. Autodesk Inventor MODEL
FRAME DESIGN PROCESS
DESIGN PARAMETERS
Autodesk Inventor MODEL
Lightweight
Compliance with SAE Rules
Multipurpose Beams
Manufacturable
Continuous Runs

10. DRIVE TRAIN DESIGN PROCESS
DESIGN PARAMETERS
CVT
10 HP Briggs & Stratton Engine
CVT Ratios
3.9 to 1
0.9 to 1
35 mph

12. DRIVE TRAIN DESIGN RESULTS
SOLidworks model
GRADEABILITY
~ 50°
OPTIMAL REDUCTION
8.29
DYNAMICS
15.7 ft/s²

13. CURRENT PROJECT STATUS
RESEARCH PHASE 100% COMPLETE
DESIGN PHASE ~85% COMPLETE
PREPARING FOR ANALYSIS PHASE
PATRAN/NASTRAN FEA

15. QUESTIONS ME 435 PROJECTS