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Rotary Racer - Car Performance

Merryfield 2014-07-19

Results

Weather ended up by being good, almost no wind, warm and with just a slight shower or two, much better than the possible thunderstoms predicted. Practice went very well and the new drivers after their spins went fine although we did get a puncture in one of the new tyres fitted near the end of practice. First F24 race was very good and we managed to win. The F24+ was exceptional. We raced neck and neck with Jet the entire race with laps within a second of each other right up to the flag. We were pushing the batteries to do this, and I think Jet was slightly undergeared, but it led to an excellent spectical :). We were just behind by 0.5 secs at the end ! Tom and Dave drove very well with the amount of concentration they had to put in. The second F24 race was again excellent and we managed to win with a good margin.

Summary

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