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Unread 05-01-2008, 21:19
eastsideboma eastsideboma is offline
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Question Throwning the ball over the over Pass

Is it possible to throw the ball over the overpass? And if so are there any velocity or safety restraints?
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Unread 05-01-2008, 21:26
Laaba 80 Laaba 80 is offline
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Re: Throwning the ball over the over Pass

I have not seen anything in the game rules saying that you cant catapuls balls. I have also not seen anything about restraints either. It is also possible that I just completely missed them both. I dont think they are too worried about a velocity though. I dont think that ball will be able to go yery fast, I think if you launch it it will just kind of float like a beach ball, however I have not got to see one of the balls up close yet. None of these are definate facts, so take them for what their worth.
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Unread 05-01-2008, 21:37
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Re: Throwning the ball over the over Pass

ok thanks i was just wondering if it was at all possible. because to have a 10 lb ball flying through the air there might be some restrictions
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Unread 06-01-2008, 06:58
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Re: Throwning the ball over the over Pass

alright our team has been discussing this option a lot...but I realized that the catapult idea wouldnt work if they wanted to say...hurdle...the ball
first off, in the definition of hurdling, it states "be moving toward the OVERPASS and/or elevating the TRACKBALL so that the top of the
TRACKBALL is higher than the LANE DIVIDER."
that means ure catapult will have to start at 6 feet (ht. of lane divider) in order for your robot to succesfully hurdle

correct me if Im wrong...
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Unread 06-01-2008, 09:00
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Re: Throwning the ball over the over Pass

Quote:
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.
You are right about the hurdling part, but not about the hurdle part. Nowhere in the definition of a hurdle does it say that you need to be in the process of hurdling. I see it that they are two seperate things. All being in the process of hurdling is protection from contact with other teams robots.
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Unread 06-01-2008, 10:14
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Re: Throwning the ball over the over Pass

Quote:
Originally Posted by neoshaakti View Post
alright our team has been discussing this option a lot...but I realized that the catapult idea wouldnt work if they wanted to say...hurdle...the ball
first off, in the definition of hurdling, it states "be moving toward the OVERPASS and/or elevating the TRACKBALL so that the top of the
TRACKBALL is higher than the LANE DIVIDER."
that means ure catapult will have to start at 6 feet (ht. of lane divider) in order for your robot to succesfully hurdle

correct me if Im wrong...

well the trackball itself is 40 inchs high on the ground, giving the facthat it is the "TOP" of the trackball must be over 6ft.

the ball is already 3' 8" without any support so really the catapult only needs to hold the ball up another 2' 4" which realy isn't a big deal!
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Unread 06-01-2008, 11:31
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Re: Throwning the ball over the over Pass

Quote:
Originally Posted by neoshaakti View Post
alright our team has been discussing this option a lot...but I realized that the catapult idea wouldnt work if they wanted to say...hurdle...the ball
first off, in the definition of hurdling, it states "be moving toward the OVERPASS and/or elevating the TRACKBALL so that the top of the
TRACKBALL is higher than the LANE DIVIDER."
that means ure catapult will have to start at 6 feet (ht. of lane divider) in order for your robot to succesfully hurdle

correct me if Im wrong...
You said it yourself, "and/or". You are hurdling when you are in your home stretch, in possession of a Trackball and moving towards the overpass (you do not need to have the top of the Trackball above six feet). G42 gives you protection while in the act of hurdling. The rules do not say you have to be in the act of hurdling (by definition) to hurdle. A hurlde is when the Trackball passess above the overpass (nothing more, nothing less) and will be scored if over your alliances overpass. For that matter, I do not see anywhere where it says that the Trackball must pass over in a counterclockwise direction, wow, does that open up possibilites! Please, someone correct me if I am wrong.

The rules could care less about how a Trackball gets above an overpass. You should be able to use a catapult, even if you are setting still and the top of the Trackball is not six feet off the ground. You will not be getting the protection of G42 if you are not moving towards the overpass tough.
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Unread 06-01-2008, 18:34
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Re: Throwning the ball over the over Pass

yea your right i dont see anywhere where it clearly states that you have to throw the ball in that motion which leaves alot of options open
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Unread 06-01-2008, 19:01
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Re: Throwning the ball over the over Pass

So that means that if............

----------------------------
/ Robot was | \
/ O <- here | \
|_____________ | ___________ |
| Alliance | Ball could |
\ Home | be thrown /
\ Stretch | here -> O /
----------------------------

...........and still count as a hurdle. As long as it passed over the alliance's overpass,

Our team believes it would, and the only down fall was that the robot wouldn't be considered "hurdling" and under the protection.

*If I'm wrong please let me know. I don't see anything wrong with it though.
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Unread 06-01-2008, 19:01
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Re: Throwning the ball over the over Pass

Today team paragon tried a mock game with students and a ball. We tried to toss the ball over the overpass but it didn't work out to good we only got it once. Also when we threw it over after the field was built someone got knock down on to the floor.
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Unread 06-01-2008, 19:07
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Re: Throwning the ball over the over Pass

No you cant throw the ball over backwards, look at the definition of crossing
Quote:
CROSSING: The act of a TRCKBALL or ROBOT passing through the plane defined by a line (i.e.
LANE MARKER or FINISH LINE) when it is projected vertically upwards. A TRACKBALL or
ROBOT shall have CROSSED a line when all parts of the object, while traveling in a counterclockwise
direction, have completely passed through the plane.
Quote:
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.
You can throw the ball backwards over the overpass, but you wont get any points for it.
Joey
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Unread 06-01-2008, 19:11
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Re: Throwning the ball over the over Pass

My last post had a text picture that did show up so below should be a corrected pic.

Apparently spaces don't show up????? ????????

..................----------------------------..................................................
................/ Robot was.....|...................\..................... ...........................
.............../ O <- here.......|....................\................. ..............................
..............|_____________ | ____________|..................................... ..........
..............|......Alliance..... |....Ball could....|........................................ ......
...............\......Home........|...be thrown..../...............................................
................\....Stretch......|.....here -> O /................................................
..................----------------------------..................................................
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Unread 06-01-2008, 20:06
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Re: Throwning the ball over the over Pass

to ccsingle07

yes, I think. It is traveling counter-clockwise, so I see no problem with this.
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Unread 06-01-2008, 20:18
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Re: Throwning the ball over the over Pass

anybody know of a fairly reliable formula for figuring out air resistance on the ball?

I've looked up the formulas online, but all I'm able to find is "high velocity" formulas and I'm not sure what exactly a "high velocity" would be.
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Unread 06-01-2008, 20:54
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Re: Throwning the ball over the over Pass

Unless I have messed up my kinematics, an initial velocity of 6.25m/s should launch an object 2m into the air, which should be plenty for hurdling. Given that this is about 23km/hr, I suspect you could adequately account for air resistance by just aiming to put the ball 30cm or so over the crossbar.

Now how you accellerate the ball to 6.25m/s... that's another issue.

Jason
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