Skip to main content

Comparisons of various drivetrains for FGC 2023

 Comparisons of Drivetrains for FGC 2023

4 Wheel Drive


They have good manoeuvrability and turning.


There is less traction because fewer wheels

Less power from motors 

Typically, the front two wheels are Omni wheels for increased turning ability.

6 Wheel Drive

Standard 6-wheel drive:


They have high traction and stability


They need more maneuverability and turning.

Two or more motors must be used per side, as splitting one motor over three wheels is horrible.

The motors have to be powered according to the turning and traction

If we use four motors, two motors power two of the middle wheels and the other two can power either the front two or the back two.

An issue that is faced is that the turning could be better. There are two methods to fix this.
1) West Coast drivetrain

-> further explained

2) Corner Omni

-> This is where the corner traction wheels are replaced with omni wheels, which helps to achieve better turning; even though the traction is reduced, it is a valuable sacrifice, as this allows for more traction than 4WD but just as good of a turning

Eight wheel drive

As in 6WD, the centre wheel is dropped to turn better. In 8WD, the four centre wheels are dropped. This allows for the stability and traction of the 6WD with the agility of the 4WD.

The two strategies are 

  1. Powering only the middle motors and letting the corner omnis be free

  2. Powering the middle motors and connecting the corner omnis by chains

The reason to go for this drivetrain is its stability and agility, but this can be tricky to achieve as, without an adequate drop, the turning can be reduced drastically

West Coast Drivetrain


West Coast drivetrains can be either 6WD or 8WD; however, only the centre wheel(s) is powered. The main point of West Coast drive is that the centre wheel(s) is dropped by around 3-4 mm. This means that only four wheels will ever touch the floor, making turning much more accessible. This is better than a 4WD as the distance between the wheels is far less, allowing the West Coast Drivetrain to turn even easier. By replacing the outer two wheels with omni wheels, turning can be made furthermore accessible.


Have very excellent mobility and maneuverability

Great traction


Slightly complicated and challenging to design

Might be too many wheels(in the case of 8WD)

Our Drivetrain Design:

Note: This drivetrain is not meant to be used but just to note some of our first paper scribbles.

(The above image depicts only one side of it)

This drivetrain, called the TriChain Drive, has three motors for power, which are placed at the back of the robot and connected by chain to all the tyres.


All motors power all wheels

All the motors are at the back, which gives more space in the front for storage and shooting mechanisms.

We can make excellent adjustments to gear ratios using chain gears.


Requires too many motors.

Having a complex chain system can cause maintenance problems.

The motor mounting could be complex to design.


Popular posts from this blog

My Learnings from FTC

In my journey, in FTC I learned many things and came across many different challenges. I had to overcome all of these challenges and I learnt a lot in the process.  One of the major things that I learnt was 3d designing. Before I had some minor knowledge of using Fusion 360 but I learnt a lot more during this competition. As the only 3d Designer in the team I had to design many of the major parts we needed for the competition. Here are a few of the things that I designed. Battery Holder To hold the battery to our robot, we needed a holder to store it and help us attach it to the robot. To start, I took the battery measurements by the scale and created a sketch to be the base, then extruded the walls and the base. I made a slot for the wire of the battery to be able to come out.  With the rough design of the battery holder down, I started the refinement of the build and filleted down all the sharp edges. However, if I were to re-design this part, I could count this step as a mistake as

Brahma of Goa

Over the last few weeks, as a part of my participation in the E-Yantra Virtual Museum competition, I have been on a journey to discover the history of one statue and its entire story. I have scoured the internet searching for leads, visited temples, talked to priests and gone around Goa to find out about this one statue. This statue is a sculpture of Brahma, a Hindu god. It is chiselled black stone and originates in the Kadamba era (12th century). It is decorated with many details, stands tall, and is bearded with Kadamba-style designs. The figure carries a ladle in its upper right Hand, The Vedas in its upper left hand. Kamandal in its lower left hand and chanting beads in its lower right hand.  Now let me walk you through my story about this statue. First, I saw images of the statue and then tried searching for information on it online. I found a few excellent articles, but those still wouldn’t give the full details. After a lot of scouring around the internet, I found one article w

Press mention for the International success at MAKEX 2022

Report on ‘The Goan’ Report on TOI Goa Report on Goa News