Design Table
Characteristic | MSXV - Reference | MSXVI - Goal |
|---|---|---|
Vehicle Class | SOV - Bullet Style | SOV - Bullet Style |
Solar Array Area | 4m2 | 6m2 (Regs Dependent) |
Wheelbase | 1.9m | dictated by mass |
Track | 0.95m | between 0.85-0.75m |
Driving Motor | 2x Rear Motors | 1x Rear |
Overall Car Mass (w/ driver) | D: 300kg | F: >400kg | 300kg |
Loading Ratio (Front:Rear) | D: 40:60 | F: 25:75 | 40:60 +/- 10% |
Driver Sitting Position | legs fully extend, lean 25o back CG Xm from rear axle | legs fully extend, lean 25o back CG Xm from rear axle (-Xm) |
Driver Max Height | 34” (hip-head) Overall: 5' 9” | < 34” if anything Overall: 5' X” +/- 2” |
Chassis Type | FSAE Style - Chromoly Steel Tube | FSAE Style - Chromoly Steel Tube |
Battery Enclosure Volume | 720 x 394 x 245 (LWH) | 2x Potentially |
Battery Enclosure Location | Directly behind driver, inline with rear axle | please be accessible (HW)
|
Overall Bounding Box |
Regs
Ref. 2024 ASC
Reg | Trait | Impacted Sub-Team |
|---|---|---|
9.1 | Bounding Box: 5m x 2.2m x 1.8m *LWH | Exteriors |
9.3 | Ground Clearance: 10cm | Exteriors + Suspension |
9.5.A | Eye height: >0.7m above the ground | Int. Structures |
8.4.B | Battery Enclosure(s) Mounted to Chassis | Battery, Int. Structures |
10.2.A.2 | Track > 1/2 width of Exteriors | Dynamics, Exteriors |
App B | Rollcage Clearances | Int. & Ext. Structures |
App J | Recommended Track to Wheelbase ratio | Wheelbase >= 1.5x Track |
Meeting Notes - Sept 17 2024
Avoiding drastic changes from MS15 to promote iterative improvements, build off existing knowledge base, and use MS15 as relevant inspiration for design
Dynamics takes priority as vehicle performance & design is greatly impacted by dynamic systems; exteriors is critical to vehicle efficiency
Space Claim System Priority List: Wheels, Suspension, motor, steering, battery, chassis, interiors, brakes, exteriors (consolidate with hardware whenever possible)
Compare and contrast to wsc regs
Mostly locked locations before reading week - Oct 14, revise in accordance with regs - around End of October
General
CAD Origin and XYZ directions
Master Assembly origin
If axis direction isn’t default, create a template New Part file on Bild
Axis direction is up to dynamics for calcs preference
Metric/ Imperial
Conclusion: Overall design in metric, critical fasteners and holes imperial only
Overall Car Mass → Look into the weight of competitors from ASC2024
Average for: SOVs, SOVs that qualified, SOVs that did well in FSGP & ASC
Occupant Cell
Driver height maximum discussion as it also leads into aerodynamic drag
if driver height reduced, aerodynamic performance optimized
if driver height increased, more people can drive
Suspension & Motor
Motor controller Space Claim
Requires airflow, 100% waterproof (not in the path of any water ingress or perfectly sealed), less then 3ft from motor, accessible when roof is up
parking brake opposite side of motor
Rear suspension: very similar to MS15
Steering
targeting ackerman steering, therefore volume in front of the upright is free game
Battery Structures
Battery box centred along right plane to balance sprung mass
Aiming to be located in front of the driver
Should still be protected by chassis tubes
Dictated by exteriors for final position
Action Items for Next Meeting
Driver selection, max height, dimension collection, location of driver along wheelbase
Wheelbase track:
Set track width 850-750mm
Distance between front plane and front contact patch
Suspension:
More accurate approximation of RSU
Width constraint on FSU
Steering: Accurate approximation for linkage volume
battery box
Lock in whether located in the front or the rear
Width is constrained by distance between suspension arms minus 2x Tube Thickness
Exteriors:
total area of array panel in reference to MS15
Meeting Notes - Sept 28 2024
2025 Regs hopefully