...
| Method | Drag Coefficient |
|---|---|
| Simuation FlowWorks | 0.16 |
| Simulation StarCCM+ | 0.137 |
| Wind tunnel (model) | 0.137 |
| Wind tunnel (Audi-Windkanalzentrum) | 0.137 |
Dynamics
| Front track | |
|---|---|
| Rear track | |
| Wheelbase | 2.51 m |
They use Schwalbe Energizer S tires.
Performance
| Top Speed | 120 km/h |
|---|---|
| Average Power Consumption | |
| Range | 275 km (without solar, using their normal pack) @ 50 km/h |
Array
| Cells | Azur Space gallium arsenide |
|---|---|
| Efficiency | 29.2% |
| Modules | 8 |
| Cells | 994 |
| Area | 3 m2 |
| Power | 875 W |
They had their array encapsulated by Gochermann Solar Technology.
They use the Brusa Tracker for their MPPT. I've never heard of these, and they don't seem to be listed anymore on their website.
| Manufacturer | Brusa Elektronik |
|---|---|
| Type | MPT-6 |
| Efficiency | 99% |
| Unit Weight | 800 g |
| Number of MPPTs | 8 |
They also say that they have a mechanism to automatically disconnect the array when the pack is fully charged.
Note: I presume they use 8 modules, since they have 8 MPPTs.
Battery Pack
| Cell Chemistry | |
|---|---|
| Manufacturer | LG ICR18650F |
| Nominal cell capacity | |
| Pack Configuration | |
| Number of Cells | 437 |
| Nominal Pack voltage | 88.25 V |
| Nominal Pack Capacity | |
| Pack Energy | 4.9 kWh |
| Temperature Sensors | |
| Cooling |
So there's actually 2 sets of numbers floating around online for the size of their battery pack (and range). This is because they had 1 pack for competing in WSC, and then increased their battery capacity for their Guinness World Record attempt.
With that being said, their WSC pack is tiny. This is because WSC didn't officially recognize cruisers until 2013's race, which meant that Bochum needed to design a Cruiser vehicle with Challenger constraints in mind.
| Dimensions | |
|---|---|
| Material | |
| Weight | 50 kg |
...
Bochum also designs their own motors, which features an adjustable air-gap.
| Nominal Power | 1.4 kW |
|---|---|
| Maximum Power | 4.2 kW |
| Weight | 22 kg (including wheel) |
Motor Controllers
They use the Tritium WaveSculptor 22.
Telemetry
They use Bluetooth to the chase vehicle.