Tag Archives: Calculator App

Free upgrades to TSD rally calculator

If you are a TSDMeter customer, you get all software upgrades free of cost. Check your version number by going to “About” in the app. If it doesn’t match the latest version listed here, mail us at info@tsdmeter.com for instructions on how to upgrade.


The most widely used TSD rally computer in India

Bangalore, Rishikesh, Visakhapatnam, Kolkata, Panjim, Shillong, New Delhi, Guwahati, Chandigarh, Kochi, Shimla.. TSDMeter users are all over the place!


Suggest a feature and get it named after you!

We are always looking to hear from you, our customers. Whatever feedback you give us, if it makes sense for the product, we will add it to the next release so that everyone can benefit from it. And to thank you, we will name the feature after you in the app!


Quirks in ideal time calculations

Updated on 20th June, 2013 with “Method IV”.

Consider this speed chart:

Begin (km) End (km) Speed (kmph)
0.00 5.00 31
5.00 10.00 29
10.00 15.00 17

And now the question: if you were to start driving at 00:00:00, what times should you be at the 4.32, 9.05 and 13.93 km marks? Simple, right?

Apprently not!

Different rally organizers have different ways of calculating ideal times. We have discovered 4 of these:

Method I
Don’t discard any fractions in the intermediate steps, round up the seconds at the end.

Method II
Don’t discard any fractions in the intermediate steps, but truncate the seconds at the end.

Method III
Calculate ideal times for each speed sector separately, discard fractions of seconds at each sector, truncate the seconds at the end.

Method IV
Calculate ideal times for each speed sector separately, round up fractions of seconds at each sector, round up the seconds at the end.

Sounds confusing just writing it! Let’s try and see if we can figure this out by answering the question using each of these methods.

4.32
Method I
Time = (4.32 – 0.00) / 31 = 0.139354839 hours
0.139354839 hours = 0.139354839 * 60 minutes = 8.36129034 minutes
0.36129034 minutes = 0.36129034 * 60 seconds = 21.677420 seconds
Rounding up, ideal time at 4.32 = 00:08:22

Method II
Time = (4.32 – 0.00) / 31 = 0.139354839 hours
0.139354839 hours = 0.139354839 * 60 minutes = 8.36129034 minutes
0.36129034 minutes = 0.36129034 * 60 seconds = 21.677420 seconds
Truncating, ideal time at 4.32 = 00:08:21

Method III
(4.32 is in the 1st speed sector)
Time = (4.32 – 0.00) / 31 = 0.139354839 hours
0.139354839 hours = 0.139354839 * 60 minutes = 8.36129034 minutes
0.36129034 minutes = 0.36129034 * 60 seconds = 21.677420 seconds
Truncating, ideal time at 4.32 = 00:08:21

Method IV
(4.32 is in the 1st speed sector)
Time = (4.32 – 0.00) / 31 = 0.139354839 hours
0.139354839 hours = 0.139354839 * 60 minutes = 8.36129034 minutes
0.36129034 minutes = 0.36129034 * 60 seconds = 21.677420 seconds
Rounding up, ideal time at 4.32 = 00:08:22

9.05
Method I
Time = (5.00 – 0.00) / 31 + (9.05 – 5.00) / 29 = 0.300945495 hours
0.300945495 hours = 0.300945495 * 60 minutes = 18.0567297 minutes
0.0567297 minutes = 0.0567297 * 60 seconds = 3.403782 seconds
Rounding up, ideal time at 9.05 = 00:18:03

Method II
Time = (5.00 – 0.00) / 31 + (9.05 – 5.00) / 29 = 0.300945495 hours
0.300945495 hours = 0.300945495 * 60 minutes = 18.0567297 minutes
0.0567297 minutes = 0.0567297 * 60 seconds = 3.403782 seconds
Truncating, ideal time at 9.05 = 00:18:03

Method III
9.05 is in the 2nd speed sector
Time to complete 1st speed sector = (5.00 – 0.00) / 31 = 0.161290323 hours
0.161290323 hours = 0.161290323 * 60 minutes = 9.67741938 minutes
0.67741938 minutes = 0.67741938 * 60 seconds = 40.6451628 seconds
Truncating, ideal time at end of 1st speed sector = 00:09:40

Time at 9.05 = 00:09:40 + (9.05 – 5.00) / 29 = 00:09:40 + 0.139655172 hours
0.139655172 hours = 0.139655172 * 60 minutes = 8.37931032 minutes
0.37931032 minutes = 0.37931032 * 60 seconds = 22.7586192 seconds
Truncating, ideal time at 9.05 = 00:09:40 + 00:08:22 = 00:18:02

Method IV
9.05 is in the 2nd speed sector
Time to complete 1st speed sector = (5.00 – 0.00) / 31 = 0.161290323 hours
0.161290323 hours = 0.161290323 * 60 minutes = 9.67741938 minutes
0.67741938 minutes = 0.67741938 * 60 seconds = 40.6451628 seconds
Rounding up, ideal time at end of 1st speed sector = 00:09:41

Time at 9.05 = 00:09:41 + (9.05 – 5.00) / 29 = 00:09:41 + 0.139655172 hours
0.139655172 hours = 0.139655172 * 60 minutes = 8.37931032 minutes
0.37931032 minutes = 0.37931032 * 60 seconds = 22.7586192 seconds
Rounding up, ideal time at 9.05 = 00:09:41 + 00:08:23 = 00:18:04

13.93
Method I
Time = (5.00 – 0.00) / 31 + (10.00 – 5.00) / 29 + (13.93 – 10.00) / 17 = 0.564880586 hours
0.564880586 hours = 0.564880586 * 60 minutes = 33.8928352 minutes
0.8928352 minutes = 0.8928352 * 60 seconds = 53.570112 seconds
Rounding up, ideal time at 13.93 = 00:33:54

Method II
Time = (5.00 – 0.00) / 31 + (10.00 – 5.00) / 29 + (13.93 – 10.00) / 17 = 0.564880586 hours
0.564880586 hours = 0.564880586 * 60 minutes = 33.8928352 minutes
0.8928352 minutes = 0.8928352 * 60 seconds = 53.570112 seconds
Truncating, ideal time at 13.93 = 00:33:53

Method III
13.93 is in the 3rd speed sector
Time to complete 1st speed sector = (5.00 – 0.00) / 31 = 0.161290323 hours
0.161290323 hours = 0.161290323 * 60 minutes = 9.67741938 minutes
0.67741938 minutes = 0.67741938 * 60 seconds = 40.6451628 seconds
Truncating, ideal time at end of 1st speed sector = 00:09:40

Time to complete 2nd speed sector = 00:09:40 + (10.00 – 5.00) / 29 = 00:09:40 + 0.172413793 hours
0.172413793 hours = 0.172413793 * 60 minutes = 10.34482769 minutes
0.34482769 minutes = 0.34482769 * 60 seconds = 20.6896614 seconds
Truncating, ideal time at end of 2nd speed sector = 00:09:40 + 00:10:20 = 00:20:00

Time at 13.93 = 00:20:00 + (13.93 – 10.00) / 17 = 00:20:00 + 0.231176471 hours
0.231176471 hours = 0.231176471 * 60 minutes = 13.8705883 minutes
0.8705883 minutes = 0.8705883 * 60 seconds = 52.235298 seconds
Truncating, ideal time at 13.93 = 00:20:00 + 00:13:52 = 00:33:52

Method IV
13.93 is in the 3rd speed sector
Time to complete 1st speed sector = (5.00 – 0.00) / 31 = 0.161290323 hours
0.161290323 hours = 0.161290323 * 60 minutes = 9.67741938 minutes
0.67741938 minutes = 0.67741938 * 60 seconds = 40.6451628 seconds
Rounding up, ideal time at end of 1st speed sector = 00:09:41

Time to complete 2nd speed sector = 00:09:41 + (10.00 – 5.00) / 29 = 00:09:41 + 0.172413793 hours
0.172413793 hours = 0.172413793 * 60 minutes = 10.34482769 minutes
0.34482769 minutes = 0.34482769 * 60 seconds = 20.6896614 seconds
Rounding up, ideal time at end of 2nd speed sector = 00:09:41 + 00:10:21 = 00:20:02

Time at 13.93 = 00:20:02 + (13.93 – 10.00) / 17 = 00:20:02 + 0.231176471 hours
0.231176471 hours = 0.231176471 * 60 minutes = 13.8705883 minutes
0.8705883 minutes = 0.8705883 * 60 seconds = 52.235298 seconds
Rounding up, ideal time at 13.93 = 00:20:02 + 00:13:52 = 00:33:54

To summarize:

  Method I Method II Method III Method IV
4.32 00:08:22 00:08:21 00:08:21 00:08:22
9.05 00:18:03 00:18:03 00:18:02 00:18:04
13.93 00:33:54 00:33:53 00:33:52 00:33:54

So how do you get around this?

Before the rally, talk to the organizer and figure out how they are calculating ideal times. If it is one of the 4 ways described above, go to “Results Type” in your TSDMeter Settings screen and choose “Computer” (Method I), “PB” (Method II), “Calcutta” (Method III) or “HMA” (Method IV). If not, let us know!


TSDMeter BASIC PLUS

Introducing “TSDMeter BASIC PLUS”, a limited edition TSDMeter BASIC with the Penalties feature. Mail info@tsdmeter.com to place an order.


TSDMeter app

Due to popular demand, we are now offering TSDMeter app without the calculator. Send us your Casio FX9860GII/SD and we will load the app for you at a reduced cost. Mail info@tsdmeter.com to place an order.


Image

TSDMeter – key help


Thank you!

Thank you all for the overwhelming response! We are working hard to keep up with the orders.

Surprisingly, every single order has been for a PRO. We believe that BASIC is pretty cool in its own right, and makes sense especially if you have already invested in a Terratrip.

So, Terratrip owners, if the videos didn’t encourage you, may be the new price of BASIC will -:)


TSDMeter PRO


TSDMeter PRO

Often, Terratrip users find it hard to run a rally in a car with only a stock odometer. How to set CAL? How to reset odo at junctions? TSDMeter solves these problems for you!

1) Set odo correction factor (similar to Terratrip’s CAL).

2) Set roadbook odo and corresponding car odo at every determinate point/junction (similar to doing DIS SET in Terratrip).

3) Get roadbook odo from car odo and vice versa.

4) Easily call out car odo to driver.

5) Run a rally in a car which doesn’t have a trip meter (working odometer is required, of course!)