Rotary Racer 7 Performance
Car Details - 2009-04-26
Weight
Car for coporate challenge 2009-04-26:
| Cars weight |
52.0 Kg |
| Battery weight |
35.6 Kg |
| Drivers weight |
45 Kg |
| Total all up weight |
132.6 Kg |
Car Details - 2008-03-22
Weight
Car for first race:
| Cars weight |
47.4 Kg |
| Battery weight |
35.6 Kg |
| Drivers weight |
42 Kg |
| Total all up weight |
125 Kg |
Weight distribution:
| Item |
Front |
Rear |
| All up |
38.2 |
86.2 |
| Without Driver |
19.2 |
64 |
| Without driver and batteries |
16.8 |
31.8 |
Car during construction. Basic frame no covering.
| Frame weight |
26.4Kg |
| Battery Weight |
17.4Kg (each) |
| Motor Weight |
6.0Kg |
| Drivers Weight |
40Kg (average) |
| Total all up weight |
107Kg |
Gear Ratios
Speed Controller
The electronic speed controller was developed by the Rotary Racer team for the Rotary Racer car. It is computer controlled using the CarComputer also developed by the Rotary Racer team. It has the following efficiency figures:
| Measurement |
Value |
| Resistance at full power |
0.011 Ohms |
| Efficiency at 24Volt 25Amps full power |
Efficiency 98.88% (estimated) |
| Efficiency at 24Volt 25Amps 90% power |
Efficiency 97.9% (estimated) |
Motor Testing
The new motor (RR2) was tested on 2008-04-23 on the motor test rig using the Motor Speed controller and car computer. The load was a motor driving 10 x 12V 50W Hallogen bulbs. We obtained the following figures:
| Speed RPM |
Current Amps |
| 840 |
7.48 |
| 1110 |
10.89 |
| 1170 |
11.89 |
| 1390 |
14.52 |
| 1570 |
17.74 |
| 1630 |
18.55 |
| 1690 (full) |
19.36 |
With no load the motor ran at 2120 RPM and used 2.21 Amps.
With a load of 14 x 12V 50W Hallogen bulbs the motors RPM was: 1600 and took 22.99 Amps.
The old motor (RR1) was tested on 2008-04-23 on the motor test rig using the Motor Speed controller and car computer. The load was a motor driving 10 x 12V 50W Hallogen bulbs. We obtained the following figures:
| Speed RPM |
Current Amps |
| 840 |
7.86 |
| 1110 |
11.09 |
| 1170 |
12.10 |
| 1390 |
14.92 |
| 1570 |
17.94 |
| 1630 |
18.95 |
| 1690 |
19.96 |
| 18.60 (full) |
23.19 |
Power Usage
| Item |
Current |
Effect on Efficiency |
| Solenoid |
0.4 Amp |
- 1.6% |
| Brake Light |
1 Amp |
- 4% |