RobotRobot: New page: Fairyweight weight class overview (rules, typical builds, getting started, where they fight)

2026-10-17T14:34:20Z

New page: Fairyweight weight class overview (rules, typical builds, getting started, where they fight)

New page

The '''Fairyweight''' class is for robots weighing up to '''150 g''' (0.33 lb). It's the smallest common weight class, and one of the cheapest and easiest ways to start building. In the UK, Australia and New Zealand, the same class is called '''Antweight''' – so a "150g antweight" overseas is a fairyweight in the US. See '''[[RobotClasses|Robot Classes]]''' for how class names vary.

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==Rules==
* '''SPARC''': 150 g, called Fairyweight in the '''[[SPARC Tournament Procedures]]'''. Shufflers can weigh 187.5 g, non-traditional drives 225 g, and walkers 300 g (see '''[[Multibots, Walkers and Shufflers]]''').
* '''UK''': the FRA and Antweight World Series call this the antweight class. AWS rules also require the robot to fit inside a 4-inch (101.6 mm) cube, and give non-rolling robots 225 g, though not every UK event enforces the cube.[https://www.robotwars101.org/ants/rules.htm]
* Some events run a '''non-destructive''' 150 g class, with no active weapons or limited ones.
* NHRL doesn't run 150 g.

==Typical builds==
* '''Drive:''' N10 or N20 micro gearmotors (see '''[[Insect Class Motors]]''').
* '''Electronics:''' an all-in-one receiver and ESC board such as the Malenki-Nano is very common (see '''[[Radio List#All-in-one boards|Radio List]]'''). Small servos power flippers, lifters and grabbers.
* '''Battery:''' typically a 2S LiPo of about 120–300 mAh (some kits use 3S).[https://shop.bristolbotbuilders.com/product/antkit/]
* '''Materials:''' mostly 3D printed, especially TPU (see '''[[3D Printing]]'''), with titanium, steel or carbon fiber parts on top-level robots.
* '''Common designs:''' wedges and pushers, servo flippers and lifters, grabbers, and small spinners.
* '''Arena:''' SPARC recommends at least 3/16" polycarbonate walls and a 3 × 3 ft floor for full combat (see '''[[SPARC Arena Construction Best Practices]]''').

==Getting started==
Fairyweights are a great first robot: parts are cheap, robots are quick to build and repair, and you can test them at home in a small '''[[Test Boxes|test box]]'''.
* '''Kits''' (as of October 2026) include complete kits from '''[https://www.turnabot.com/ Turnabot]''' (around $175–180 before radio and charger), drive kits from '''[https://shop.bristolbotbuilders.com/product/antkit/ Bristol Bot Builders]''' (UK), and the '''[https://combatrobotics.co.nz/pages/crnz-antweight-kit Combat Robotics NZ kit]'''. See '''[[Kits]]'''.
* '''Printable designs:''' there are well over a hundred free 150 g designs listed on the '''[[3D Printing]]''' page.

==Where they fight==
150 g is one of the most common classes at US local events, and the main small class in the UK, Australia and New Zealand. Find events on '''[https://www.robotcombatevents.com/ RobotCombatEvents.com]''' (see '''[[Events]]''').

==See also==
* '''[[Antweight]]''' – the next class up (1 lb)
* '''[[RobotClasses|Robot Classes]]'''
* '''[[Kits]]''' and '''[[3D Printing]]'''

Fairyweight - Revision history

RobotRobot: New page: Fairyweight weight class overview (rules, typical builds, getting started, where they fight)