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Unread 22-02-2008, 17:40
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Two Questions Regarding Hurdling

So I was thinking of a strategy with a mentor, and we were thinking about blocking a ball being hurdled with a launcher. Assuming that we make no contact with the robot hurdling is this legal?

I was thinking something along the lines of having our elevator all the way up braced against an opponents overpass. When the opponent would go to launch their ball it would hit our elevator and bounce off. I'm assuming that this is a legal move because we would have made no contact with the opposing robot and if we were bumped our robot would be moved.



Now for question 2. According to the manual a Hurdle is defined as: HURDLE: When a TRACKBALL CROSSES a FINISH LINE while passing above the OVERPASS
and then contacts either the floor or another ROBOT before re-contacting the originating ROBOT.

Does this mean that theoretically passing the trackball over is considered a hurdle?


I would Post in Q/A but I have no clue who has the Username and password
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Last edited by thefro526 : 22-02-2008 at 17:43.
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Unread 22-02-2008, 17:45
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Re: Two Questions Regarding Hurdling

First question, legal yes. But wise? Some of those trackballs will be coming with a good velocity on them.

Second question, I don't understand what you're asking.
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Unread 22-02-2008, 17:56
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Re: Two Questions Regarding Hurdling

In the second question I meant to ask is one robot passing the trackball to another robot a hurdle?

And I think If we braced our elevator right it could take the hit from a trackball
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Last edited by thefro526 : 22-02-2008 at 18:00.
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Unread 22-02-2008, 17:59
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Re: Two Questions Regarding Hurdling

Quote:
Originally Posted by thefro526 View Post
In the second question I meant to as is one robot passing the trackball to another robot a hurdle?
For the second question, I think it would be a hurdle.
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Unread 22-02-2008, 18:01
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Re: Two Questions Regarding Hurdling

That is what I though the rule mean too.
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Unread 22-02-2008, 18:11
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Re: Two Questions Regarding Hurdling

I think for q2, you need to be more specific. I interpret your question to be this situation:

Blueabot Alpha is has just hurdled a blue trackball over the Blue Overpass. The ball lands in the Red homestretch and is picked up by Blueabot Beta. At this point Blueabot Alpha has passed under the Blue Overpass and completed a lap. Blueabot Beta decides to pass the blue trackball to Blueabot Alpha.

At this point, Blueabot Beta passes the ball from the opponents side of the field, over the Blue Overpass, and into the arms of Blueabot Alpha.

This does NOT count as a hurdle.
To complete a proper hurdle, the robot must be in it's own homestretch.

That is, if I interpreted your question correctly.
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Unread 22-02-2008, 18:16
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Re: Two Questions Regarding Hurdling

Quote:
Originally Posted by Scott Carpman View Post

This does NOT count as a hurdle.
To complete a proper hurdle, the robot must be in it's own homestretch.

That is, if I interpreted your question correctly.
That is incorrect. To have the hurdling protection, a robot must be in it's own homestretch. Still a legal hurdle.
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Unread 27-02-2008, 07:39
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Re: Two Questions Regarding Hurdling

Also the ball has to hit the ground or a robot from the other alliance before anything else otherwise it doesn't count as a hurdle.
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Unread 27-02-2008, 08:26
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Re: Two Questions Regarding Hurdling

From the GDC:

Rule <G42> protects a Robot and any Trackball that may be in its possession during the Hurdling attempt. The Trackball is only protected while it is in the possession of the Robot. If a Robot launches or throws a Trackball, then that protection is no longer in effect once the Trackball breaks contact with the Robot. So, an opposing Robot may attempt to block a launched Trackball. But any team building a Robot that will attempt to do so should be very aware of the effects of momentum, inertia, impulse loads on long moment arms, dynamic stability, and what happens when an unstoppable force strikes an immovable object.
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Unread 27-02-2008, 08:57
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Re: Two Questions Regarding Hurdling

Question One: Probably OK, however, most of the launchers that I have seen would not have any trouble pointing a little left or right to shoot around you unless your elevator is really wide (80").

Question Two: Yes. It looks like it will be OK to pass to another robot on your alliance as long as no part of that robot is in or above the home stretch and it must be clear to the refs that for at least a split second the trackball is not in contact with the catching robot after the trackball has completely passed the finish line. There are several Q&A's that get close to answering this question but none that specifically talk about the catching robot.

MasterAlex: I searched the rules and Q&A, I am sorry if I missed it, but I did not find anything that says it must be a robot from the other alliance. This could impact several strategies we are working on. Could you please point me in the right direction to find that ruling, I could have missed something. Thank you in advance.

Last edited by ALIBI : 27-02-2008 at 09:03.
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Unread 27-02-2008, 10:16
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Re: Two Questions Regarding Hurdling

Unless you can reach over 11' high, our robot (Phoenix) will have no problem shooting over you

Quote:
however, most of the launchers that I have seen would not have any trouble pointing a little left or right to shoot around you unless your elevator is really wide (80").
I would think most (if not all) can do this.
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Unread 27-02-2008, 12:28
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Re: Two Questions Regarding Hurdling

Another thing to consider if this strategy is employed is the moment arm that is created by bracing against the overpass. I believe that if you are blocking and not attempting to hurdle a bump from another robot is allowed to signal a pass. Even a small bump to signal a pass may have devastating consequences.
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Last edited by dpc131 : 27-02-2008 at 16:00.
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Unread 27-02-2008, 12:38
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Re: Two Questions Regarding Hurdling

as for blocking it is legal but you will have a hard time at it even if you do some how manage to be in the way at the right time most shooters that i have seen could simply back up a few feet, taking advantage of their considerable range, and throw the ball well over your arm unless it is 10 to 11 feet high so legal but not nessecarily practical
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Unread 24-03-2008, 20:47
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Re: Two Questions Regarding Hurdling

Also, you mentioned "bracing" the arm of your bot. The rules forbid attaching to any of the field elements, so it depends also on what you meant by that
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Unread 24-03-2008, 21:01
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Re: Two Questions Regarding Hurdling

here check out this video. http://robotics.arc.nasa.gov/events/...s.php#webcasts two in a row by 537 at about 1:15 to 1:20 they wobble a bit but it was amazing. I was in que for the next match so i saw that and i was just like the whole crowd was like on their feet yelling because it was so amazing to watch
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