Please make it so we can take the ballast out of our cubes!

Please make it so we can take the ballast out of our cubes!
Posted by Brian Zawodniak at 2016-11-22 14:05:50

Please make it standard for open and stock classes to remove the ballast from their cubes for the 2017 challenge.  We just tested a cube in the pool without the ballast and it sunk without issue.  We will have pool practice again after Thanksgiving and I will give an update regarding on how our ROVs move the less heavy cube.  I can tell you the ballasted cubes were impossible to surface with.  Thank you!

Re: Please make it so we can take the ballast out of our cubes!
Posted by Harvey Bonser at 2016-12-13 08:03:12

It was nice to see that the ballast has been removed.. ours measured just under 500 grams and that caused us to completely revamp this year's design.

Brian Zawodniak wrote on 2016-11-22 14:05:50:

Please make it standard for open and stock classes to remove the ballast from their cubes for the 2017 challenge.  We just tested a cube in the pool without the ballast and it sunk without issue.  We will have pool practice again after Thanksgiving and I will give an update regarding on how our ROVs move the less heavy cube.  I can tell you the ballasted cubes were impossible to surface with.  Thank you!



Re: Please make it so we can take the ballast out of our cubes!
Posted by Dan Hicks at 2017-05-22 13:48:35

Were the Sea Perch 2017 Cubes with, or without ballast?  Many teams were unable to even move the cubes, let alone pickup.  A big difference operating ROV's at 3.5 ft  vs  10.5 ft such as the GTRI pool...

Brian Zawodniak wrote on 2016-11-22 14:05:50:

Please make it standard for open and stock classes to remove the ballast from their cubes for the 2017 challenge.  We just tested a cube in the pool without the ballast and it sunk without issue.  We will have pool practice again after Thanksgiving and I will give an update regarding on how our ROVs move the less heavy cube.  I can tell you the ballasted cubes were impossible to surface with.  Thank you!



Re: Please make it so we can take the ballast out of our cubes!
Posted by Kevin Garner at 2017-05-23 10:46:59

We had 3 teams at Nationals, and all 3 teams were regularly putting up all 32 points on the Challenge in under 6 minutes each.  However, at Nationals, none of them could even lift the cubes.  We built our cubes to "spec" as shown in docs here on the website, complete with backer foam and ballast removed.

I believe we were "undone" by using pool noodles as floats.  During our debrief and analysis Saturday evening, we all seemed to come to the same conclusion.  We were practicing in a 6-foot depth pool. Nationals was a 10-foot depth.  The Additional depth was compressing our pool noodle floats and killing our buoyancy.  We dominated the regional competition, but it was only in 4-foot depth.  So, we never anticipated the additional depth at Nationals would be an issue.

We won't make the same mistake next time.  We are already looking into alternative floats.  I'm also trying to figure out a way to simulate or practice a 10-foot depth.

On a side note, I spoke to several other coaches Saturday evening and several were pretty upset that the 10-foot depth spec for the Challenge was never mentioned or publicized.  I seem to remember reading it somewhere, but can't remember where.  So, was the 10-foot depth known ahead of time?

Dan Hicks wrote on 2017-05-22 13:48:35:

Were the Sea Perch 2017 Cubes with, or without ballast?  Many teams were unable to even move the cubes, let alone pickup.  A big difference operating ROV's at 3.5 ft  vs  10.5 ft such as the GTRI pool...

Brian Zawodniak wrote on 2016-11-22 14:05:50:

Please make it standard for open and stock classes to remove the ballast from their cubes for the 2017 challenge.  We just tested a cube in the pool without the ballast and it sunk without issue.  We will have pool practice again after Thanksgiving and I will give an update regarding on how our ROVs move the less heavy cube.  I can tell you the ballasted cubes were impossible to surface with.  Thank you!





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