SAE Mini Baja GROUP MEMBERS: JOHN MERRITT FRANCES OTHERSEN CHRIS DAVIS JAMES CHAPMAN JOSEPH FANNING

Objective Purpose: Design and build an off road vehicle to meet the specifications of the SAE Baja competition. Tasks: Design a rear suspension to include passive rear steering and design a traditional trailing link. Design a two speed gearbox with spur gears. Total Budget: $12,000 Projected Completion date: April 30, 2015 Goal: Place in the top ½ of competitors overall.

Work Breakdown Gearbox Members: Suspension Members: Chris Davis John Merritt Overall team leader Lead Design Frances Othersen Analytical testing Scribe James Chapman Design/Material Selection Suspension Members: Chris Davis Analytical Testing Scribe Joseph Fanning Lead design

Gantt Chart

Budget Analysis The total budgeted cost that we have accumulated so far is $1,171.28 We have chosen to go with a spur gearbox vs. the helical gear box with some of the main issues being time to manufacture and cost. A helical would take about three weeks at $2000 vs .the Spur at about $700 plus and 2-3 business days to acquire In addition we have chosen to go with a standard trailing arm link suspension vs. the passive rear steer with similar issues of time and cost to manufacture. For example going with the standard link suspension system will be about $700 cheaper and we will have less components to manufacture

Current Gearbox Progress Top View Side View Gear Ratios: 8.66:1 11.2:1 Isometric View

Gearbox Analytical Test Gear 6 Maximum Deflection: 3.354e-005 inch Gear 5 Maximum Deflection: 2.855e-005 inch

Rear Suspension Traditional Trailing Arm Isometric View Rear View

Current Rear Suspension with Passive Rear Steer Progress Pivots about two points Mounting point allows for one extra degree of freedom Isometric View Assembly

Current Rear Suspension with Passive Rear Steer Progress Completed swing arm design with passive steering Right Side View Top View

Current Rear Suspension Progress Side View Assembly Rear View Assembly

Rear Swing Arm Analysis Analytical Test SolidWorks Analytical Test SolidWorks Deformation results without shock absorbers: Patran: Max deformation 6.94e-001 in SolidWorks: Max deformation: 2.545e-003 in

Rear Passive Steering Knuckle Analysis Force Applied= ½ * Driver Weight + ½ * Cart Weight Results: Max deformation of hub = 2.27e-005 in Max deformation mounting points = 2.058e-003 in

Next Steps Analytical testing of specific areas of concentrated stresses Order remaining material Manufacturing Testing fitting Assembly Driver Selections Competition preparation 2014-2015 Frame Design

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