1. Geneva Baja SAE Project Progress Report
Part 2/2
Geneva Baja SAE Project Progress Report

2. Drive Train
SAE specifies using a Briggs & Stratton 10 Hp OHV Intek Model
SAE requires the governor setting not to exceed 3800 RPM

3. Manual Transmission vs. CVT
More efficient
More control
Throttle response
CVT
Easier to use
Easier to install
Engine always
running at max rpm
Must stay dry

4. Manual Transmission
Yamaha YZ-80 Engine

5. Drive Train Setup Engine-Transmission Transmission-Rear Axle
Belt Drive for better high rpm performance
One variable pitch pulley, and one constant pitch pulley to adjust for different events
Shifting engine to tension the belt
Transmission-Rear Axle
Chain drive for easier matching of existing subassemblies
Shifting Axle to tension the chain

6. Estimated Speed (MPH) 1st 2nd 3rd 4th 5th 6th Low 3.5-8.1 4.6-10.6
High

7. Suspension Design
Suspension Assembly Drawn By Scott Miner

8. Design Goals Lightweight Long suspension travel
Achieve high ground clearance
Aesthetically pleasing
High durability
Economically feasible
Relatively simple to manufacture/mate to frame

9. Front Suspension Design Considerations Steering System
Suspension Travel
Camber Angle
Caster Angle
Toe Angle
Ackerman Angle
Bump Steer

10. Camber Angle

11. Caster Angle

12. Toe Angle

13. Ackerman Angle

14. Bump Steer
Bump Steer is when the wheels steer themselves without input from the steering wheel. The undesirable steering is caused by bumps in the track interacting with improper length or angle of suspension and steering linkages.

15. Front Suspension Design
2007 Polaris Outlaw
A-Arms
Spindle/Hub Assembly
Brake discs/calipers
Fox® Podium X Upgraded Shocks (stiffness, rebound damping adjustable)
Tie rods

16. Rear Suspension Types Vs. Independent Trailing Arm
Notice the ground clearance difference where the sprocket is on both set-ups

17. Independent Rear Suspension
Pros
Ground Clearance
Aesthetics
Handling
Cons
Efficiency
Complexity

18. Rear Suspension Design
2007 Polaris Outlaw
A-Arms
Hubs
Brake Disc and Caliper
Rear Drive Axle Assembly
Fox® Podium X Shocks with Piggyback Reservoirs

19. Remaining Work Finalize all aspects of frame design
Finalize all aspects of drive train design
Fabricate entire vehicle
Testing/Driver training
Rework issues discovered during testing
Travel arrangements
Additional fundraising

20. Acknowledgements (1/2) Dr. David Che, project advisor
Mr. Dave Clark, shop advisor
Mr. Mark Bergfelt, Bergfelt Racing, technical & racing advisor
Mr. Wendell Kibler, drive train advisor
Geneva College Physical Plant
Kristen Ortendahl, Geneva IA office
Bolland Machine, Chippewa, PA

21. Acknowledgements (2/2)
Dr. Vern Ulrich, Grove City College, Baja SAE project advisor
2009 Baja Fall Invitational, Columbus, OH volunteer crew
Various Baja SAE teams, especially the following:
Grove City College
Oregon State University
University of Tennessee, Knoxville
Fairmont State University
Ohio State University
Ohio Northern University

22. Questions? Contact Nick Bloom, Team Captain 717-701-0477