Just watch
We might bring these to a competition for a side competition with team members and other kids of all ages.
âŚHow exactly does this use water? If they are water balloons, they already used balls filled with water in the 90âs (pretty sure it was 1993)
From the video description, they are Hydraulic arms⌠in other words, the arms move through transferring pressure from one location (likely the controls held in the studentâs hands) to another (the pistons controlling the arm) using water (or another liquid) as a medium. Similar to pneumatics, except water is much less compressible than air. As a result, you donât have a big reservoir of pressure like we do with pneumatic storage tanks - instead, the pistons move when you squeeze the controls, with roughly equal volume displacements in both locations (in order to be equal, you would need a perfectly non-compressible fluid, but itâs close enough)
It mentions that the arms are hydraulic.
Did you guys design and laser cut those arms yourselves?
Neat!
Interesting that youâve posted this, Iâve considered using water as a hydraulic fluid for a FIRST robot, but never had the chance to implement it. I wonder if it would pass inspection?
R08 is the only applicable rule I can find, but it could be debated whether or not dihydrogen monoxide is hazardous. 
In the blue box below 2013âs R08, it says âExamples of items that will violate R08 include (but are not limited to)âŚHydraulic fluids or hydraulic componentsâ.
I read that blue box as constraining the interpretation of R08 to specifically treat all of those things as if they are inherently unsafe (etc.), irrespective of the observed level of safety of a given mechanism at a given time.
The potential bad affects of a leak in a hydronic line are really what make it unsafe for FIRST robots. Water and electricity are a bad combination for a robot! Further, a leak would most likely result in âdamageâ to the field, forcing other matches to play through a puddle/soaked carpet. Regardless of the precautions you might take to prevent leaks, we all know anything can happen with these robots. Iâve seen hits bend structural frame material before, and arms accidentally get stuck inside another robot causing all sorts of damage to wiring and pneumatic tubing. If the Auto industry canât design a car that doesnât run a risk of leaking brake fluid (granted, they have gotten much better and itâs not very common⌠But it does still happen), I doubt you can design a robot without that same risk!
In a similar way, consider this yearâs game. With climbing, we anticipated that many teams would want to be able to adjust their center of gravity or weight. A âcleverâ way to do that would be with a reservoir of sand or bbâs or something similar. It seems great, but thereâs a huge concern for spillage. What happens when the robot takes a hit and bbâs go rolling around the field? Field reset would be cleaning them up all weekend! Fortunately, I donât think we saw much of thisâŚ
And People were afraid of the water game joke 
No we did not this year. These were from pitsco. We are thinking about laser cutting our own designs next year. We are also going to upscale and use pneumatics and plywood over the summer just for fun. 
The idea for next year part is a joke !!!:ahh: