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The Western Ghats
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Force W

Time Speed Distance

Understand TSD Rally Movie

What is TSD?

TSD - is the short form for Time, Speed & Distance

Why is it called a TSD rally?

This is a rally not a race. In this rally it is precision what is required and not speed. It is called a TSD rally because you are supposed to be at the right place at the right time by traveling the right distance. You will get penalty points for either being early or being late to a particular point and the penalties are higher for being early than for being late (This is not a Speed rally remember)

What is the significance of T - Time?

The organizers will give you a speed chart at the start of the rally. This speed chart indicates the average speed at which you need to travel between various distance in the rally. For example travel from 0 to 5 K.M at 30 KMPH. This will determine the time to be taken between the given distance, which in this example is 10 min. so you are to travel 5 kilometers in 10 minutes. Which also means that you are to cover 1 kilometer in 2 minutes, 2 kilometers in 4 minutes etc. So basically you have to be at the right place at the right time.

What is the significance of S - Speed?

As informed earlier you will be given a speed chart at the start of the rally. So to be at the right place at the right time what you will have to do is maintain the right average speed. That exactly is the Speed we are talking about.

What is the significance of D - Distance?

The organizers will give you a route chart in the form of a tulip chart at the start of the rally. This tulip chart gives you the Distance and direction as to where you have to go. Only if you follow this chart you can be at the right time at the right place. So, this is the most important part of the rally and you have to make sure that you follow this chart properly. (Tip – you can be early or late at a given point but if you are not at the point you are not early nor late, so the first objective – be on the right route)

What are you to do in the rally?

Now that you know what is T, what is S and what is D you have to integrate T, S &D together to achieve your goal (to be at the right place at the right time). As informed earlier you are given a Speed chart and a Tulip chart at the start of the rally. You have to follow the instructions on both these charts properly and simultaneously.

How to read a Tulip Chart?

Tulip Chart
The above mentioned chart explains how you are to read a Tulip chart. This is fairly simple and if you follow the instructions properly you would never get lost.

What are symbols used in a Tulip Chart?

What is an Odo meter or Odo reading?

The Odo meter is nothing but a trip meter. All new generation cars have 2 meters on their instrumentation panel/ Speedo meter, which give the distance reading. Generally the meter on the top gives the total distance a car has traveled from the time of purchase and the second/ lower meter is the trip meter, which has a small knob by the side. If you press this knob the meter is zeroed and it will give you the trip/ odo reading of the journey you are going to undertake.

Now, that looks very simple. Is there any catch in a tulip?

No, there is never any catch in a tulip and the tulip is prepared in such a way that you get all the required information. But, the catch is in the form of difference in Odo/ trip meter reading. This difference is because all cars invariable of the make or size or shape will have a difference in the Odo reading. This will vary even if the air pressure in your car tyre is not all right. Or you have changed the tyres on your car to other fancy tyres. Two journeys on the same route in the same car will also show different odo readings.

What do you do if there is difference in your Odo / trip meter reading?

There is nothing to worry or panic. There is bound to be a difference in the odo reading of the Tulip chart and your car. There are 2 methods to solve this.

Method one: All you have to do is that on every given marking or landmark in the tulip chart calculate and make note of the odo error/ difference. Then add or subtract this difference to get the right reading of the next marking or landmark. For example in the given tulip when you reach the 4 crossing at St. Jospeh's School the Tulip odo is 2 Kms. But your car odo reads 2.1 Kms. The difference in odo is 0.10 Kms. So add 0.10 kms to the next reading and you should reach the Round about at 3.90 Kms. On your car Odo. Continue this practice of calculating at every marking throughout the rally.

Method two: Travel the entire rally on the part odo/ distance reading of the Tulip chart. Zero your car odo/ trip meter at every given marking/ landmark of the tulip. This is a better and simpler method and more accurate because the error in odo reading is smaller in smaller distances and when you zero the odo at a marking the earlier error is nullified and there is no carry forward of error. In the same given example tulip chart. When you reach the 4 crossing at St. Jospeh's School the tulip Odo is 2 Kms. But your car odo is 2.10 Kms. So you zero the odo at the 4 crossing and travel for 1.80 Kms to get to the round about.

How to read a speed chart?

A. 0.00 To 5.00 Kms. Travel at 30KMPH
B. 5.00 To 7.40 Kms. Travel at 36KMPH
C. 7.40 To 9.40 Kms. Travel in 2 min.
D. For the next 5 minutes travel at 24 KMPH

In a speed chart you will be given the figures of any 2 of the reading of T, S, D (Time, Speed & Distance). So the basic work you have to do is to first determine the 3rd reading and then to split the distance to be covered on a minute to minute (per minute) basis. (Tip – Tabulate the speed chart it is simpler to read and interpret). The basic formula required for calculations are;
In the given example A. - Distance (D) is 0 to 5 Kms. = 5, so 5 x 60 = 300, 300/ 30 Speed (S) = 10 minutes
In the given example B. - Distance (D) 5 to 7.40 = 2.40, so 2.40 x 60 = 144, 144/36 (S) Speed = 4 minutes.
In the given example C. - D (Distance) 7.40 To 9.40 Km = 2, so 2 x 60 = 120, 120/2 Time (T) = 60. So speed is 60KMPH.
In the given example D. - Speed (S) 24 x Time (T) 5 = 120, so 120/60 = 2. So distance is 2 kilometers.

Now that you know how to calculate T, S & D you have to calculate the distance to be traveled per minute (d).
In the given above examples
A. d = 0.50
B. d = 0.60
C. d = 1.00
D. d = 0.40

Now that you can read a tulip and calculate from a speed chart it is time to know how to integrate it. In the given example. You have to be at the first right turn in 1 minute. You have to get to St. Jospeh's School in 4 minutes from start or 3 minutes after taking the right turn. You have to cross the round about at 3.80 Kms. in the 8th minute from start or 4 minutes after turning right at St. Jospeh's School.

What is a Time control or TC?

Time control or TC are undisclosed locations in your route where Officials/ organizers called Marshal will stand and check whether you are there on the right time. These TC's are located on a kilometer reading, which come on the full minute. For e.g. you start the rally at 9 A.M and are traveling through the rally route properly. After taking the right turn at St. Jospeh's School (2.00 Kms) you find there is a marshal standing in the rally route direction little further ahead, this means that the Marshal is standing at 2.50 Kms. Or 0.50 km. From St. Jospeh's School. So as per your calculation you are to be at 2.50 Km in 5 minutes. This means you are to be at the TC at 9:05 A.M. So you drive upto the marshal who will note the time you reach at the TC on your Time card and if you are late or early at the TC you will get penalty points accordingly.
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