Carrying <G44>

[aldaeron]

I am new to FIRST and wanted to get everyone's opinion on Carrying (Rule G44). I was wondering if you intentionally kick the ball on top of your robot - (i.e. using your robot as a ramp - see attached image) would it count as CARRYING when the ball left the floor?

Please note: I am aware that the attached image violates rule R16

Thanks!

-matto-

[GaryVoshol]

I would think that would be CARRYING. For the half-second while the ball was going up your robot ramp, if your robot makes a sharp turn, the trajectory of the ball would change. Thus your robot's motion was controlling the movement of the ball, the defintion of POSSESSION. POSSESSION with the ball not in contact with the floor is CARRYING.

[kirtar]

It depends, but I'm inclined to say it's not. If your robot was to turn, while the trajectory would change. It may not remain in the same location relative to the robot because it is probable that it will slip and/or roll and stay in roughly the same position that it was (absolute position). Its kind of like pulling a tablecloth from under a bunch of glasses. In addition, if you were to back up, the relative position would quite obviously change. I'd say this one would need to go on Q&A, although I'm not seeing a way to do this well because of the whole bumpers thing.

The reasoning used would also imply that in the instant that a ball lands on your robot off of a short fall such that it rolls off of your robot that it will be counted as carried. In other words, as long as the drop is short, it implies that you carry the ball for an instant in time whenever a ball for example, rolls of the platform and onto your robot regardless of a design to make it fall off.

[Creator Mat]

i understand the game manual is overrides the the game video but in the video they made a point to say even accidental carrying is illegal. Also from what i saw in the game manual they made no provisions saying accidental carrying is allowed. So i think this idea of having an "accidental" carrying method would be illegal.

[BrendanB]

What I read in the manual is that if your robot has a ball on top of it whether intentional or not, it will be deemed a penalty. They also made a mention of recommending that teams build their robots so that no balls could wind up sitting on top of your robot. If a ball is moving on top of your robot, I would like to think that it is not a penalty in that a penalty only comes when a ball is at rest on your robot, but I would check in FIRST QandA just to check.

[AmoryG]

If it's touching the playing field then you're not carrying the ball. It looks like in the picture part of the ball is touching the ground. It does not violate <G44>.

[hipsterjr]

Question:

Would a funnel designed to catch returned balls so that they land right in front of your kicker be in violation of the <G44>? You aren't carrying the ball, just "influencing" its trajectory

[Chris is me]

Originally Posted by hipsterjr

Question:

Would a funnel designed to catch returned balls so that they land right in front of your kicker be in violation of the <G44>? You aren't carrying the ball, just "influencing" its trajectory

I'd ask the Q&A. My opinion? If you turn or back up as it falls down the chute, does the ball stay in the robot? if so, it's CARRYING

[hipsterjr]

Originally Posted by Chris is me

I'd ask the Q&A. My opinion? If you turn or back up as it falls down the chute, does the ball stay in the robot? if so, it's CARRYING

It would fall right off the robot and not be in contact with the robot for more than a second. The funnel idea would just keep it from bouncing off the robot and flying across the field and make us chase it down.

[Donut]

Originally Posted by hipsterjr

Question:

Would a funnel designed to catch returned balls so that they land right in front of your kicker be in violation of the <G44>? You aren't carrying the ball, just "influencing" its trajectory

Remember that your robot must be entirely surrounded by bumpers, and since you cannot extend beyond the starting frame (ignoring last 20 seconds and tower touching...) any guides would lead the ball to simply hit your bumper and bounce away.

Any funnels that guided the ball on the inside of the bumpers would cause the ball to violate the 3" incursion rule beneath the robot (you could also get potentially flagged for interacting with game pieces above the bumper zone).

So I'd say you will end up with a penalty of some sort for this device, which one I don't know.

[hipsterjr]

OK, let me word it this way...

All robots are encouraged to have some kind of slope so that balls don't get stuck or ride on top of the robot. All I am talking about is adding a sort of "tunnel" like cover to the slope that would make it like a tilted funnel. This would cause the ball to roll in front of us instead of bouncing away


excuse the quick rough drawing

[aldaeron]

I just wanted to clarify my original question. Again, I am aware the picture above is illegal with respect to bumpers and many other things. It's just meant to be a simple illustration.

What I am trying to figure out is - for the fraction a second that the ball is touching the robot and not touching the floor - is that a carry?

I think this will need to be answered by FIRST, but do appreciate all the responses.

I agree that robots will need some sort of covering (pyramid, dome, etc) to ensure balls bounce off the robot and can't be stuck.

[Donut]

Some manual definitions:

POSSESSION: Controlling the position and movement of a BALL. A BALL shall be considered in POSSESSION if, as the ROBOT moves or changes orientation (e.g. backs up or spins in place), the BALL remains in approximately the same position relative to the ROBOT.

CARRYING: POSSESSING a BALL that is not in contact with the FIELD.

According to this, a ball that merely bounces off the top of a robot is not considered POSSESSED. However a ball that would then pass through some sort of "funnel" would be considered POSSESSED while inside the funnel, and thus would incur a <G44> penalty. Any air herding device, regardless of whether it is within the bumper zone or at the edge of the robot, would cause a ball to be POSSESSED while in the air resulting in CARRYING.

With these definitions balls can bounce off of robots without penalties, so as long as you do not use something considered a MECHANISM you can strategically deflect balls (no funneling) with your robot as they fall from the ball return.

[Chris is me]

Can you draw a picture of where the ball lands?

If I'm thinkning what I think it is and it's basically just a flat slope with nothing else on it (ie if you turn it slides off, if you go backward it slides off) then I think it's legal (Q&A prevails of course)

[lcoreyl]

It appears the possible loophole here is:
______________
POSSESSION: Controlling the position and movement of a BALL. A BALL shall be considered in POSSESSION if, as the ROBOT moves or changes orientation (e.g. backs up or spins in place), the BALL remains in approximately the same position relative to the ROBOT.

CARRYING: POSSESSING a BALL that is not in contact with the FIELD

<R19> ROBOTS must be designed so that in normal operation BALLS cannot extend more than 3 inches inside the FRAME PERIMETER below the level of the BUMPER ZONE.
______________

According to the definition, possession only happens if you move. Carrying includes the definition of possession, so if you're not moving, you're not in possession, you're not carrying. So your funnel would seem to work if you don't move during the period it is being funneled and you kick it from above the bumper zone

However, since they are playing off of a soccer analogy, I'm pretty sure they are intending for you to never do anything with the ball other than have it deflect off the top. Otherwise you could build a shooter that doesn't move.