Shell Eco-marathon Americas 2025 | Karcharias

Americas 2025

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US0013001 Karcharias

Cedarville University

Prototype P Internal Combustion Engine ICE Gasoline

Results

Attempt 4

314.7

740.2

km/l

mpg us

Best attempt

Current Rank

4th / 6

3 322.8 km/l 759.3 mpg us +2.6%

4 314.7 km/l 740.2 mpg us

5 176.5 km/l 415.2 mpg us -43.9%

Technical Inspections

Before they get on track, Prototype vehicles need to pass a series of 11 technical inspections. For some, the only goal is getting through this test. Many never even make it that far.

11/11
Complete 11/11 inspections passed

Passed

1. Inspection Queue Entry

7 / 7

Passed

2. Driver's Control

21 / 21

Appropriate motorsports helmet - Primary Driver (21 a-f)

Three-quarter helmet - Primary Driver (21 b)

Helmet label readable - Primary Driver (21 c)

Helmet has no cracks/indentations - Primary Driver (21 c)

Visor is clear and has no cracks - Primary Driver (21 d)

Racing suit (s) / Gloves - Primary Driver (21 d)

Single piece fire retardant racing suit - Primary Driver (22 a)

Shoes; socks & balacava/FRC - Primary Driver (22 b, d)

Driver weight (> 50kg) - Primary Driver (20 a)

Appropriate motorsports helmet - Reserve Driver (21 a-f)

Three-quarter helmet - Reserve Driver (21 b)

Helmet label readable - Reserve Driver (21 c)

Helmet has no cracks/indentations - Reserve Driver (21 c)

Visor is clear and has no cracks - Reserve Driver (21 d)

Racing suit (s) / Gloves - Reserve Driver (21 d)

Single piece fire retardant racing suit - Reserve Driver (22 a)

Shoes; socks & balacava/FRC - Reserve Driver (22 b, d)

Driver weight (> 50kg) - Reserve Driver (20 a)

Ballast required?

Ballast based on lightest driver (20 c)

Ballast of suitable type, proper location, sealed (20 b)

Passed

3. Vehicle Weight

2 / 2

Passed

4. Brakes

11 / 11

Brake documentation (67 c ii)

2 Hydraulic brake system 1 front & 1 rear (43 a)

1 single Hydraulic circuit per axle (43 a)

Foot operated front brake by single pedal (43 a)

Rear brake by single lever or pedal (43 a)

Brake pedal 1,000 mm², min width 30 mm (43 a v)

Brake rotors point in direction of wheel rotation (43 a)

No acting on tyres (43 a)

All wheels have brakes (43 a)

Ergonomy (43 a)

Effectiveness Ramp Test - Dynamic (43 b)

Passed

5. Vehicle Dimensions

6 / 6

Passed

6. Seat Belts, Roll bar & Exit

20 / 20

Safety belt must be designed for motorsports use (29 g)

Mounting points are clearly accessible for inspection (29 e)

Safety Belts = 5 mounting points (29 a-b)

Safety Belts - chassis fixing (29 d)

Must have 5 independent belts attached to structure (29 a)

Crotch strap under body (29 b)

Top strap angle (29 b)

Safety belt must be in straight line between mounting point and shoulder (29 f)

Length adjustor high enough for adjustement (29 b)

Safety belt has a tight fit (no slack) (29 c)

No modifications of safety belt (29 h)

Safety belt strength verified (29 d)

Crumple space-protect from front/side impact (25 a ii)

Roll bar resist 70 kg all directions (26 d)

Roll bar 50 mm > driver's head - Primary Driver (26 b)

Roll bar width > shoulders - Primary Driver (26 c)

Roll bar 50 mm > driver's head - Reserve Driver (26 b)

Roll bar width > shoulders - Reserve Driver (26 c)

Driver exit < 10 seconds - Primary Driver (30 a-d)

Driver exit < 10 seconds - Reserve Driver (30 a-d)

Passed

7. Visibility

8 / 8

Passed

8. Mechanical Vehicle Design

22 / 22

Fully closed body (25 j, g)

Quality of body driver collision protection (26 a-d)

Front Crumple Zone = 100 mm (25 a ii)

Solid floor & frame (25 i)

No external appendages or sharp edges (25 c)

Body panels do not change shape in wind (25 b, d)

Internal/ext'l opening mech effective/intuitive (30 c)

Method of opening accurately marked with sticker (30 c)

No adhesive tape to close driver compartment from outside (30 d)

Bulkhead rigid & fire resistant (27 b-d)

Bulkhead isolates energy/driver compartment (27 a)

Chain/belt guard (all rotating equipment) (34 g)

Running wheels (Pr:3/4, UC:4) (25 a iii)

Rims compatible with the dimensions of the tyre (41 a-b)

Wheels isolated from driver, chassis, or body (41 c)

Nothing touching wheels (e.g. batt, wires, etc...) (41 e)

Steering is efficient and has no play (32 b-d)

If electric steering, demonstrate default safe state (32 d)

Intuitive steering control (32b)

Wheel compliance (48 c)

Tyres do not exceed manufacturer's recommended age (49 d)

Tyre valves are accessible (49 f)

Passed

9. Electrical Vehicle Design

18 / 18

Correct vehicle electrical schematic (67 c)

Max 60 V Peak (57 a)

Only one Battery, 2 terminals, single physical package (57 b, i)

Batt mount firm, behind b/head, not under seat (57 c)

Main fuse < 300 mm from +ve terminal ADD fuse size (57 e)

Elec system has proper fuse protection (57 e)

Only allowed electrical devices powered by accessory battery (57 h)

Electrical enclosures - transparent (57 j)

Wiring organized and safe (27a, 57 k)

Electrical wiring connections visible/no splices (57 k)

JM Installation in engine compartment (56 c)

JM visible and accessible from outside (56 b)

JM Correct circuit location (56 c)

JM Counting Correctly (56 c)

Internal Estop Switch (37 f i)

External Estop mounting location (37 f ii)

Latching External Estop push button (no push/pull levers) (37 g)

Blue triangle sticker (37 f iii)

Passed

10. Energy Verification

26 / 26

Passed

11. Final Check

4 / 4

Previous participation
Event	Vehicle category	Energy class	Rank	Result
United States 2026	Prototype P	Internal Combustion Engine ICE (Gasoline)	4	510.72km/l 1201.3mpg us
Americas 2024	Prototype P	Internal Combustion Engine ICE (Gasoline)	8	256.71km/l 603.81mpg us
United States 2022	Prototype P	Internal Combustion Engine ICE (Gasoline)	-	Passed technical inspection

Americas 2025

US0013001 Karcharias

Cedarville University

Results

Attempt 1

Attempt 2

Attempt 3

Attempt 4

Current Rank

Technical Inspections

1. Inspection Queue Entry

2. Driver's Control

3. Vehicle Weight

4. Brakes

5. Vehicle Dimensions

6. Seat Belts, Roll bar & Exit

7. Visibility

8. Mechanical Vehicle Design

9. Electrical Vehicle Design

10. Energy Verification

11. Final Check

Previous participation