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

Drive Train SAE specifies using a Briggs & Stratton 10 Hp OHV Intek Model 205432 SAE requires the governor setting not to exceed 3800 RPM

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

Manual Transmission Yamaha YZ-80 Engine

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

Estimated Speed (MPH) 1st 2nd 3rd 4th 5th 6th Low 3.5-8.1 4.6-10.6 5.6-13.0 6.7-15.4 7.6-17.6 8.6-19.9 High 4.7-10.8 6.1-14.1 7.5-17.3 8.9-20.5 10.2-23.5 11.5-26.5

Suspension Design Suspension Assembly Drawn By Scott Miner

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

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

Camber Angle

Caster Angle

Toe Angle

Ackerman Angle

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.

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

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

Independent Rear Suspension Pros Ground Clearance Aesthetics Handling Cons Efficiency Complexity

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

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

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

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

Questions? Contact Nick Bloom, Team Captain 717-701-0477 nick.bloom@geneva.edu