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Courtesy of FRC Team 4817: One Degree North
This H-Drivebase example is an adapted version of the Omni Drivebase from Team 4817's 2021 FRC Game Bot Design (Reference 1).
A H-Drivebase uses a Tank Drivebase that utilizes only Omni Wheels (which can also be referred to as an Omni Drivebase) and adds on an additional Omni Wheel perpendicular to the main wheels.
Diag. R4.1: H Drivebase Top View
This extra perpendicular wheel allows for the drivebase to strafe side to side, granting more manuverability.
For a full overview of the macro design of WCD and other FRC drivebases, refer to Macro Design: Preparing for the Game Drop chapter 2.
* Further explanation of H-Drivebase in FRC Handbook Volume 1.