Shell Eco-marathon Europe and Africa 2025 | TUS Team

Europe and Africa 2025

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603

BG0003001 TUS Team

Technical University of Sofia

Urban Concept UC Hydrogen Fuel Cell H2

Results

Attempt 2

176.4

109.6

km/m3

mi/m3

Best attempt

Current Rank

3rd / 3

2 238.4 km/m3 148.2 mi/m3 +35.2%

3 176.4 km/m3 109.6 mi/m3

Technical Inspections

Before they get on track, Urban Concept 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

10 / 10

Bound/Printed documentation (67 c)

Telemetry equipment installed (67 c)

Charging Protection (fire blanket, Lipo bag) (24 l)

Charger (57 d iii)

SHELL logo front / both sides (4 a-c)

Race number front / both sides (4 a-c)

Partner sticker both sides (4 a-c)

Lift here arrow stickers (26 f)

Opening mechanism stickers (30 c)

Other stickers < 400 cm² (4 d)

Passed

2. Vehicle Weight

2 / 2

Passed

3. Driver & Safety Gear

19 / 19

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

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 (> 70kg) - Primary Driver (20 a)

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

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 (> 70kg) - Reserve Driver (20 a)

Ballast required?

Ballast based on lightest driver (20 c)

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

Passed

4. Brakes

11 / 11

Brake documentation (67 c ii)

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

Ergonomy (both hands on steering mech.) (32 c)

Effectiveness Ramp Test - Dynamic (51 e)

4 disc hydraulic brake (51 a)

X design or front / rear (51 b)

Brake pedal 2,500 mm² (51 a)

Parking brake must keep vehicle stationary on ramp (51 d)

Disc thickness > 3 mm (51 a)

One dual master cylinder or 2 master cyls (51 c)

Commercial brake system, not bicycle (51 a)

Passed

5. Driver Safety

24 / 24

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 at 10° 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)

Quality of body driver collision protection (26 a)

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)

Front vis 180° & Tint - driver must be seen - Primary Driver (28 a)

Rear visibility - see cheat sheet - Primary Driver (28 b)

Front vis 180° & Tint - driver must be seen - Reserve Driver (28 a)

Rear visibility - see cheat sheet - Reserve Driver (28 b)

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

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

Passed

6. Vehicle Dimensions

11 / 11

Height 1000 - 1300 mm (45 a)

Width 1200 - 1300 mm (45 b)

Length 2200 - 3500 mm (45 c)

Track width > 1000 mm (front) (45 d)

Track width > 800 mm (rear) (45 d)

Wheelbase > 1200 mm (45 e)

Ground clearance > 100mm (45 g)

Drivers compartment > 880 mm (45 f)

Width at drivers shoulder > 700 mm - Primary Driver (45 f)

Width at drivers shoulder > 700 mm - Reserve Driver (45 f)

Two Doors - Min 500 x 800 mm (46 d)

Passed

7. Mechanical Vehicle Design

37 / 37

Passed

8. Electrical Vehicle Design

32 / 32

Passed

9. Energy Verification

19 / 19

Documentation (schematic, H2 flow, fuel cell, regulator) (67 c, 65 a i)

No external starter battery (65 k iii)

Hydrogen cylinder firmly installed (65 b iv)

Regulator installed correctly (65 a iv 1)

Pipe H2 suitable, S.Steel (1.0 bar), PTFE (<1.0 bar) (65 e)

Connectors H2 OK (comp type, no Teflon) (65 e iv)

Normally closed solenoid valve (37 f i)

Pressure relief valve installed and set correctly (65 a iv 4)

Pressure relief valve vents outside vehicle (65 a iv 4)

Purge pipe vents outside or not used (65 f)

Correct system design (65 a iv)

2 ventilation holes 5 cm² (65 c)

Hydrogen sensor at highest point (65 d)

Leak Check OK (65 e)

Telemetry H2 flowmeter installed and functioning (70)

Supercap Joulemeter reading voltage & Energy (65 i iii)

Emergency shutdown function (H2 Valve & Propulsion) (37 f iii)

Efficiency of Estop (3 methods, valve/MC) (37 f iii)

Dead man's switch (37 i)

Passed

10. Telemetry

8 / 8

Passed

11. Final Check

4 / 4

Previous participation
Event	Vehicle category	Energy class	Rank	Result
Poland 2026	Urban Concept UC	Hydrogen Fuel Cell H2	3	119.75km/m3 74.41mi/m3
Europe and Africa 2024	Urban Concept UC	Hydrogen Fuel Cell H2	3	204.08km/m3 126.81mi/m3
Europe and Africa 2023	Urban Concept UC	Hydrogen Fuel Cell H2	5	164.48km/m3 102.2mi/m3
Netherlands 2022	Urban Concept UC	Hydrogen Fuel Cell H2	-	Did not pass technical inspection

Europe and Africa 2025

BG0003001 TUS Team

Technical University of Sofia

Results

Attempt 1

Attempt 2

Attempt 3

Attempt 4

Attempt 5

Current Rank

Technical Inspections

1. Inspection Queue Entry

2. Vehicle Weight

3. Driver & Safety Gear

4. Brakes

5. Driver Safety

6. Vehicle Dimensions

7. Mechanical Vehicle Design

8. Electrical Vehicle Design

9. Energy Verification

10. Telemetry

11. Final Check

Previous participation