Drivetrain Deep Dive: Swerve Drive

Swerve Drive. The holy grail of FRC, and now, the rising star of FTC. It looks cool. It moves cool. But is it worth the $1000+ price tag and the programming nightmare?

What is Swerve?

In a Swerve system, every wheel is independently driven (for speed) AND independently steered (for angle). There are 4 modules. This means 8 motors total.

The Result: True Holonomic Movement.

• The robot can translate in ANY direction.
• The robot can rotate while translating.
• The robot has traction (unlike Mecanum).

The DECODE Advantage

In the DECODE season, the field is tight. The “Secret Tunnel” is narrow.

• Defense Evasion: Swerve allows you to “juke” defenders. You can face your shooter at the goal while driving sideways away from a blocker.
• Alignment: You don’t need to line up your chassis. You just line up your gun. The chassis can be at any angle.

The Cost of Greatness

1. Money: Swerve modules are expensive.
2. Motors: It eats 8 motor ports. If you have a Rev Control Hub + Expansion Hub, that leaves ZERO ports for Intake, Shooter, or Lift.
   • Solution: You essentially must use Axon servos or custom diffy-swerve to save ports, or accept that you have 0 motors for mechanisms.
3. Code: Writing a custom Swerve library is hard. (Though libraries like RoadRunner and others are making it easier).

Is it Worth It?

If you have the budget and the coding talent, Swerve is superior. It is the future of FTC. But if you spend 3 months building a Swerve drive and 1 week building an Intake… you will lose.

Verdict: High Risk, Maximum Reward.