Nuna 5: Difference between revisions
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Revision as of 04:04, 7 September 2009
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This file may be deleted after Monday, 24 August 2009.
The Nuna 5 is the newest solar racing car which is currently being built by the Nuon Solar Team. Nuna 5 will compete in the 2009 World Solar Challenge starting october 25. The solar car is built by the Nuon Solar Team. This year’s Nuon Solar Team consists of 14 students from Delft University of Technology. Like previous years, Dutch energy supplier Nuon is the main sponsor of the team. The team is assisted and advised by professor and former astronaut Wubbo Ockels.
The Nuna 5 solar racer has big improvements in weight and solar cell efficiency over its predecessors.
Progress of the design and production of Nuna5
The Nuon Solar Team has been designing and building Nuna5 on a fulltime base since September 2008. After two series of wind tunnel tests at the Low Turbulence Tunnel laboratory of Delft University of technology in December and January, the aerodynamic design was finished late January 2009. The team is building the car since February 2009. The car is built from carbon fiber at Schaap Composites shipyard in Lelystad, which is known for having built the ABN Amro Volvo Ocean Race boats [1].
Regulations
The World Solar Challenge 2009 regulations are comparable to those from 2007, the year in which Nuna4 was racing. Major changes of regulations are mainly the diminished battery weight, which has been changed from 30 kg (2007) to 25 kg (2009) [2]. Besides this change, teams also have to comply with new regulations regarding tires. In this year’s edition of the race, teams are not allowed anymore to race on slicks. Instead, teams should use grooved tires.
Solar panel
Like previous Nuna’s, Nuna 5 will be equipped with Gallium Arsenide triple junction solar cells. The solar cells have an estimated efficiency of 34% and are normally used on solar panels in space [3]. From regulations it is allowed to carry 6 square meters of solar cells. Due to the type of solar cells on Nuna 5, Nuna 5 will compete in the Challenge Class of the World Solar Challenge.
History
The Nuon Solar Team has won the World Solar Challenge four times in a row. Special is the first victory of the team, which at that time was still called the Alpha Centauri Team, since it was the first time a new team won the World Solar Challenge. The 2007 regulations changes created several challenges which were first incorporated in Nuna 4. The driver was required to sit upright with a seating angle of at most 27 degrees. Additionally, the solar panel area was limited to 6 square meters. The 2009 regulations for Nuna 5 also added the requirement for profiled tyres and less battery weight
Technical specifications
| Technical stats on Nuna 5 [4] | |
|---|---|
| Measurements | Length: 4.82 m Width: 1.76 m Height: 0.90 m |
| Weight (excluding driver) | <160 kg |
| Driver weight | Minimum 80 kg (using added weights) |
| Number of wheels | 3 |
| Number of solarcells | 2120 cells (Gallium‐Arsenide Triple Junction)) |
| Solarcells surface | 6 m² (new 2007 rules maximum) |
| Efficiency solarcells | 34 % |
| Maximum speed | Approximatly 140-150 km/h |
| Engine | InWheel Direct Drive Electric Engine (Efficiency: 97 – 99 %) |
| Battery | 25 kg Lithium-ion polymer |
| Body | Carbon fiber and Twaron (aramidfibre)/ Titanium rollbar |
| Front wheel suspension | Double wishbone of carbon fibre / Metal springs which incorporate shocks / Carbon fiber shock absorber/ Aluminium rims / Ceramic barings |
| Rear wheel suspension | Horizontal fork of carbon fiber / Aluminium connection points |
| Front brakes | Custom ceramic brakedisc / Aramid breaklines |
| Rear brakes | Regenerative brake |
| Tyres | (profiled tyres) |
| Rolling resistance | 10 times less than an average car |
| Air resistance | 12 times less than an average car |
| Telemetry | WiFi to support car |
| Numberplate | |
References
- ^ ABN AMRO To Build Boats For The Volvo Ocean Race In Lelystad
- ^ Technical Regulations WSC 2009
- ^ "Development and Production Of European III-V Multi-Junction Solar Cells" (PDF).
AZUR SPACE is presently offering a 35% efficient lattice-matched triple-junction concentrator cell (3C-35%
- ^ Technical stats page on nuna 5 (dutch)