This is the mechanism that I came up for shooting the cannon by extending it. Turns out the 'ball' at the back is the same width as a stud, so it has clutch with the inside of a technic hole. Moving the cannon forward leaves the back stuck in the technic brick, once you get to the full extent of the travel, the back is released, firing the cannon.
>>8142592>>8142600>>8142697Thanks!
>>8143094Thanks, the windscreens are brand new. They're on bricks and pieces thanks to lego movie space pandering, set 70821.
>>8142986Thanks. I came up with the 'action feature' first, then built the rest of the satellite around it. I didn't know it was going to be a satellite before I started. I think 90's stuff cared more about play than looks, so that's what I tried for.
>>8143046Any chance you could post the other entries? I haven't seen them.
