document.xls V1 1 04/17/2023

Baja SAE Design Spec Sheet 2013

--Please do not modify the format of this sheet. Common formatting will help keep the judges happy!

Car No. 15

School University of Baja SAE

Dimensions Front RearOverall Length, Width, Height 95" (2413 mm) long, 62" (1575 mm) wide, 65"(1651 mm) high

Wheelbase 70" (1778 mm)

Track Width 55" (1397 mm) 50" (1270 mm)

Curb Weight (full of fluids) 436 lbs (198 kg)

Weight Bias with 150 lb driver seated 53% 47%

Weight with 150 lb driver seated 312 lbs (142 kg) 274 lbs (125 kg)

Suspension Parameters Front Rear

Suspension Type

Tire Size and Type 23x8-10 ITP Mudlite 23x8-10 ITP MudliteWheels (width, construction) 6" wide, Forged Al, 4/2 offset 7" wide, Forged Al, 4/3 offsetCenter of Gravity Design Height 25" (635 mm) above ground (confirmed with testing (tip method))Vertical Wheel Travel (over the travel)

2" (50.8mm) 0" (0mm)Total track change (over the travel) 3.5" (88.9mm) 4" (101.6mm)Wheel rate (chassis to wheel center) 25 lbs/in (4.8 N/mm) 43.2 lbs/in (7.6 N/mm)Spring Rate 100 lbs/in (17.5 N/mm) 120 lbs/in (21 N/mm)Motion ratio / type 0.5 / linearRoll rate (chassis to wheel center) 4.14 degrees per gSprung mass natural frequency 1.2 Hz 1.5 HzType of Jounce Damping High and low speed adjustable High and low speed adjustableType of Rebound Damping Low Speed adjustable FixedRoll Camber (deg / deg) 2.62 deg / deg 2.62 deg /degStatic Toe -0.2 deg toe (toe out) 0.3 deg toe inToe change (over the travel) 1 deg 0 deg Static camber and adjustment method -0.5 deg, adj. via inboard rod endsCamber Change (over the travel) 6 degrees 4 degreesStatic Caster Angle 9 degrees, adjustable 0 degrees, non-adjustableCaster Change (over the travel) 6 degrees 0 degreesKinematic Trail 2" (50.8mm) 0Static Kingpin Inclination Angle 10 degrees non-adjustable No KingpinStatic Kingpin Offset 2" (50.8mm) No KingpinStatic Scrub Radius -1" (-25.4mm) No KingpinStatic Percent Ackermann 60% NonePercent Anti dive / Anti Squat 40% Anti dive 30% Anti SquatStatic Roll Center Position 12" (305mm) above ground 13" (330mm) above ground

3Outside Turn Radius 15' (4.57 m) to right 16'(4.88 m) to the left

Brake System / Hub & Axle Front RearRotors

Master Cylinder(s) 2 Polaris 3/4" bore master cylinders with adjustable bias bar

Competitors please replace the sample specification values in the table below with those appropriate for your vehicle and submit this as described in the rules. This information will be reviewed by the design judges and will be referred to during the design event.

--The sample values are fictional and should not be used as the baseline for your designs. Please DO NOT make up values!

Dual unequal length A-Arm, Fox Podium X Coil over shocks, Adj. Roll bar.

Dual unequal length A-Arm, Fox Podium X Coil over shocks

6" (152 mm) jounce/ 4" (102 mm) rebound

7" (178 mm) jounce/ 5"(127 mm) reboundRecessional Wheel travel (over the

travel)

0.6 average 0.4-0.7 actual progressive rate

-1.5 deg, adj. via outboard rod end on A-arm

Number of steering wheel turns lock to lock

Outboard, Fixed, 1018 Steel, 7"(178mm) dia. X .125" (3.2mm)

Inboard, Single Brake, Fixed, 7"(178mm) dia. X .125" (3.2mm)

document.xls V1 2 04/17/2023

Calipers

Hub Bearings

Upright Assembly CNC 7075-Al, integral caliper mount

Axle type, size, and material

DrivetrainTransmission CVT, Comet drive, student built 6061-T6 AL roller drivenFinal Drive Type Student built 2 speed gearbox 7075-T6 ALFinal Drive Ratio 11.8Differential Type Torsen LSDTheoretical Top Speed (Power limited, R40 mph, 42 mph 1st gear ratio (Or Starting CVT Ratio) 5.222nd gear ratio 4.163rd gear ratio 2.154th gear ratio 1.875th gear ratio 0.856th gear ratio (Or Final CVT Ratio) 0.66Half shaft size and materialJoint type GKN 6 ball, 72mmMaximum tractive effort 600 lbsAcceleration time 100’ / 150’ 3.5 seconds / 4.5 secondsMaximum grade capability 30% gradePredicted max axle torque 800 lbs-ft (1085 N-m)Peak driveline torque threshold, what compo1000 lbs-ft (1356 N-m), Half shaft fails

ErgonomicsDriver Size AdjustmentsSeat (materials, padding)Instrumentation Dash mounted fuel gauge, 5 LED tach

Frame Frame Construction and Material 4130 Tubular space frame with 1020 steel brackets and tabsJoining method and material GTAW ER70-S2 filler Targets (Torsional Stiffness or other) 2000 lbs-ft/deg (2712 N-m/deg)Torsional stiffness and validation methBare frame weight with brackets and pa55 lbs (25kg)

Optional InformationBody Work? Vac-formed plastic bodySpecial Bit A? LCD driver number displaySpecial Bit B?

Willwood, Single Piston, 2" (50.8mm) dia., Floating

Student Built, Dual Piston, 1" (25.4 mm) dia., Floating

Tapered roller bearings. Separate spring loaded rubber lip seal

Single 5205 dbl row ang contact bearing with integral seal

Weldment, 4130 sheet, heat treated, shot peened

Fixed spindle, 1" (25.4mm) dia, 4130 steel normalized

Rotating axle, 1" (25.4mm), 4340 steel, RC 40

30mm OD solid 8620 steel case hardened to Rc 60 1.3mm deep, Rc 28 core hardness

Fixed seat and steering wheel. Pedals adjust fore and aft 3" (76.2 mm) from center positionCarbon Fiber, 1" (25.4mm) thick PP seat foam , 2" (50.4mm) thick PP foam head support

2100 lbs-ft/deg (2847 N-m/deg) CAE beam model, 1800 lbs-ft/deg (2440 N-m/deg) physical test