What's New
-Support for the latest devices and iOS
-Improved the database update process to show more details
-Removed the text erasing buttons on the text fields when editing notes
-Moved the gear and diameter pickers up so that the results can be seen whilst changing the settings
-Updated database and manufacturers
-Various other little tweaks and improvements
Enjoy your R/C racing!
App Description
Ratio Calc is a quick and easy tool for radio control car racers to use trackside. Knowing your final drive ratio (FDR) is very useful for comparison with other racers to determine if your car is geared correctly. You can also view your favourite information on Apple Watch.
It lets you quickly select your car by filtering on manufacturer and model. Select your pinion and spur size and the FDR is displayed. Tyre diameter can also be entered to calculate your rollout.
Ratio and roll out charts are also available which plot pinion and spur gear combinations to create very handy reference tables.
- Save your favourite cars for quick access
- Save notes and track name against your favourite cars
- Share ratio/rollout charts
- Download new cars from within the app
- Select measurement units (imperial/metric)
- Select your preferred gear pitch, alternative ratios in other pitches will be shown
- Over 1600 cars/variants in the database
App Changes
- June 14, 2014 Initial release
- January 27, 2015 New version 5.10
- March 11, 2015 Price increase: $1.99 -> $2.99
- March 17, 2015 Price decrease: $2.99 -> $1.99
- May 19, 2015 Price increase: $1.99 -> $2.99
- May 28, 2015 New version 6.0
- June 28, 2015 Price decrease: $2.99 -> $1.99
- June 29, 2015 Price increase: $1.99 -> $2.99
- September 05, 2015 Price decrease: $2.99 -> $1.99
- October 07, 2015 New version 6.0.1
- October 19, 2015 Price increase: $1.99 -> $2.99
- November 06, 2015 New version 6.1
- July 09, 2016 New version 6.2
- August 01, 2016 Price decrease: $2.99 -> $1.99
- November 08, 2016 Price increase: $1.99 -> $2.99
- November 11, 2016 New version 6.3
- June 14, 2019 New version 6.6