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Rotary Racer - Car Performance
Goodwood 2014-06-08
Results
Weather was excellent, very little wind and warm. Practice went very well considering the number of new young drivers. First F24 race was very good and we managed to win. The F24+ race went very well we managed 2nd. The second F24 race was cut short by a spin by one of the new drivers, but he managed to get back out on track and continue to finish the race.
Car Computer Log
This shows the main items measured by the Rotary Racers car computer. They are:
| Item | Description |
|---|---|
| Throttle | The position of the twist grip throttle from 0 to 100% |
| MotorCtl | The motor power output setting. The Car computer sets the motor power based on the drivers throttle position, the speed of the car and the current being used. There is a software algorithm to implement this "drive by wire" system. The Car computer drives the PWM (Pulse Width Modulation) Motor Speed controller with a duty cycle proportional to this value. 0 - 100% |
| Speed | The speed of the car in Km/H calculated from the magnetic read switch pulse generator by the Car Computer. |
| Voltage | The batteries voltage under load. |
| Current | The current being taken from the batteries. |
| Charge0 | The charge left in the battery pack 0. This is calculated by the car computer using an algorithm that has been honed to match the battery discharge curves for the Yuasa batteries. It currently bases its results on the current being used from the battery. |
| Charge1 | The charge left in the battery pack 1. This is calculated by the car computer using an algorithm that has been honed to match the battery discharge curves for the Yuasa batteries. It currently bases its results on the current being used from the battery. |
| Charge2 | The charge left in the battery pack 2. This is calculated by the car computer using an algorithm that has been honed to match the battery discharge curves for the Yuasa batteries. It currently bases its results on the current being used from the battery. |
| BatPack | The battery pack in use (0, 1 or 2), the turbo button (4) and the Pitstop warning (8) . We generally change the battery pack with each driver change. |
| Temp | The Temperature of the motors casing in degrees C. |
| GPS | GPS position, speed and time together with lap position information |
| Misc | Other items describing the operation of the control system |
The graphs show the overall data, the actual ASCII data log files are also available, from the links below, for detailed analysis.
F24+
F24 Race 1
F24 Race 2
Practice Laps Data
Notes
- We used an 18:48 gear ratio in the F24 and a 22:48 in the F24+
- F24+ driver was: Dawn.
- F24-1 drivers were: Louise, Becky, Joe.
- F24-2 drivers were Jacob, Tristan
- F24-1 Batteries were:
- F24+ Batteries were: RR11/RR12
- F24-2 Batteries were: RR9/RR10
- Two new drivers managed to spin the car. We need to investigate why this happened.