Lego GBC WIP Catapult was originally designed by Tom Atkinson, that has gained notoriety as a perpetual Work-In-Progress, so I decided to reverse engineer it from YouTube videos.

Night Lighting

The module is has my custom Lego UV/Led lights, with the UV shining on the balls and the Lego light passing through a trans-blue brick to color the module.

Videos of the Original

This module has featured in a lot of videos over the years.

BrickWorld Chicago 2014, the module can be seen at 6:58

BrickFair Virginia 2014, the module can be seen at 11:16.

BrickWorld Fort Wayne 2016, the module can be seen at 11:09.

These are the videos I used to reverse engineer the original.

BrickFair Alabama 2016, the module can be seen at 9:40.

BrickFair Virginia 2017, the module can be seen at 16:26.

BrickWorld Indy 2017, the module can be seen at 8:04.

Videos

Videos of this module in operation.

Modules

Builds and revisions to this module.

Original

Pieces Cost Time
600+ $$ N/A

Around 2016 Tom said he would re-build the module, this is when it gained notoriety and started to feature more in videos.

Revision 1

Pieces Cost Time
600+ each $$ 1 Month
  • Reverse engineered from YouTube videos.
  • Ended up being 90% similar as a few areas I needed to guess.

Revision 2

Pieces Cost Time
600+ each $$ 1 Week

Tweaks to improve the original.

  • Redesign gearbox to reduce complexity.
  • changed shooter arm design to stop a jam between the chute and the arm.