Ratio Calc‪!‬ 4+

Name: Ratio Calc!
Price: 1.99 GBP
Rating: 3.9 (12 reviews)
Author: David Mills

Gearing for your R/C car

David Mills

Designed for iPad

- 3.9 • 12 Ratings

- £1.99
- Offers In-App Purchases

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.

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

- Select measurement units (imperial/metric)

- Select your preferred gear pitch, alternative ratios in other pitches will be shown

- Over 2000 cars/variants in the database which is updated regularly

8 Jan 2025

Version 7.4.1

-Improved the app layout when landscape on the largest phones

3.9 out of 5

12 Ratings

Great app needs one small addition

Love the app, but would be amazing with either iCloud backup or an import export feature to something as simple as JSON. If it had this I would happily give it 5 stars

Update

Don't like the update

Version 7.0 not fit for purpose

Used this app for years but latest version will not let you change tyre diameters so pretty much useless

I’ve improved tyre diameter entry now and I believe all of the major issues have now been addressed in the latest update (v7.3).

The developer, David Mills, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.