42046 - Catapult
A catapult with a spring-loaded firing mechanism
The firing is actually aimed more down than forward
For one thing, it made me appreciate the problem of designing catapults
For another, it's better for not losing parts :)
In the LXF there is no part 12799 (the spring-loaded part) so I used some other bricks to simulate it. It is the first Group defined in the LXF.
I recommend loading the spring a little before inserting the firing arm. That way the trigger actually works and the Catapult fires.
I use the the fire-hubcaps as ammunition.
Waiting for Inventory to load
Use LEGO Digital Designer to open these files and generate step by step building instructions.
This MOC also has a 3D digital file available (eg LDD, MPD, etc): 3D Model