Discs Bounce Out of Goals

[avanboekel]

We were finding the same problem when testing shooting into the pyramid goal. The disks don't fall down into the goal, but rather bounce straight back. We were shooting at about 90% speed of our shooter when trying to do this.

Has anyone else tested shooting into the pyramid goals?

[avanboekel]

Originally Posted by avanboekel

We were finding the same problem when testing shooting into the pyramid goal. The disks don't fall down into the goal, but rather bounce straight back. We were shooting at about 90% speed of our shooter when trying to do this.

Has anyone else tested shooting into the pyramid goals?

Originally Posted by Mr. 1033

Are you going straight on towards the goals or at an angle?

We found the more speed and spin on the disc increased this issue.

If a linear shooter:
Try adding a flywheel or motorized wheel to the opposite side of your shooter wheels.

We did this and got a repeatable shot with less spin.

We were shooting at a pretty straight angle. If we are going to try to shoot them in match, we'll probably have to move closer to the goal, and decrease the speed.

[capnslow]

Originally Posted by avanboekel

We were finding the same problem when testing shooting into the pyramid goal. The disks don't fall down into the goal, but rather bounce straight back. We were shooting at about 90% speed of our shooter when trying to do this.

Has anyone else tested shooting into the pyramid goals?

Yes, we have tried shooting at the pyramids and think that in order to do so the Frisbee must really land in the goal and you can't rely on the chains to stop the Frisbees because Frisbees do bounce and or spin off of the a lot.

[djdaugherty]

The game rules say (3.1.5.1) that if any part of the disc has crossed through the opening, it will be considered scored. I assume that means it doesn't matter if it bounces back out.

[Johnbot]

Originally Posted by djdaugherty

The game rules say (3.1.5.1) that if any part of the disc has crossed through the opening, it will be considered scored. I assume that means it doesn't matter if it bounces back out.

Did you read the very next phrase:
"is in the GOAL at the end of the MATCH"?
I took that as they have to be in the goal after the match to count.

__________________________________________________ _________________________
Our team just built the team field, so some of us are worried that our discs will bounce out, and we currently don't plan on pickup up discs. Because of this, we might be in for a surprise like last year, where all of our shots went clean over the baskets at our first competition because the balls weren't the same density as the ones we used to practice.

[djdaugherty]

But it also says that it "is not in contact with any robot on the alliance." How could it possibly be in contact with a robot and also in the goal?

[Johnbot]

If you dump in the 5-point goal of a pyramid, there is a chance for them to cross the goal opening, but still touch your dumping mechanism.

[djdaugherty]

You're right. I was thinking only of the other goals. According to the game questions clarifications (#71), if the discs bounce out, they do not count.

[Retired Starman]

As in every year, the field IS the field. It is the same field for every team. I hate to see scored Frisbees bounce out, but it will probably happen to every team, unless someone has a shooter that floats the disks in to a soft landing.

I suspect that most teams have been designing for longer, faster, harder shots. Makes me think my original idea of a robot to scoop them up off the floor and dump them in the low goal might not have been such a bad idea after all!

Dr. Bob
Chairman's Award is not about building the robot. Every team builds a robot.

[Alpha Beta]

Has FIRST published an official change to the chain structure of the goals? I don't remember seeing it in an update, but the week zero scrimmages clearly had the chain strands connected at the bottom.

http://www.youtube.com/watch?v=sWF3hHrAwxg
http://www.youtube.com/watch?v=xN9IU...ature=youtu.be

Surprised no one has brought this up on CD to my knowledge. Am I just seeing things?

Seeing all of the unconnected strands in the reveal videos last night brought it to mind again.

[dtengineering]

Balls bounced out of the goal in 2006.

The playing field characteristics were clearly documented.

I think teams could have reasonably predicted that having discs "stop" inside the goal would be a factor.

Jason

[Gregor]

Originally Posted by dtengineering

Balls bounced out of the goal in 2006.

The playing field characteristics were clearly documented.

I think teams could have reasonably predicted that having discs "stop" inside the goal would be a factor.

Jason

Many teams, mine included, didn't include chains in our goals. We just had a hole.

[Andrew Schreiber]

Originally Posted by Gregor

Many teams, mine included, didn't include chains in our goals. We just had a hole.

Seems like a great lesson on the importance of emulating the actual environment as closely as possible while testing.

[Mark McLeod]

Originally Posted by Alpha Beta

Has FIRST published an official change to the chain structure of the goals? I don't remember seeing it in an update, but the week zero scrimmages clearly had the chain strands connected at the bottom.

http://www.youtube.com/watch?v=sWF3hHrAwxg
http://www.youtube.com/watch?v=xN9IU...ature=youtu.be

Surprised no one has brought this up on CD to my knowledge. Am I just seeing things?

Seeing all of the unconnected strands in the reveal videos last night brought it to mind again.

I don't see what you mean.
The chains appear to be swinging quite freely.

[Alpha Beta]

Originally Posted by Mark McLeod

I don't see what you mean.
The chains appear to be swinging quite freely.

Between 6 and 14 seconds on this video it sure seems like something is connecting the bottom edge of the chains to each other. They move together like a curtain. If they were not connected at the bottom I would expect the strands to fly in opposite directions from the initial point of contact with the disc. The bottom edge is free from the box, but has limited freedom from the neighboring strands.

At 1:31 I can see that the strands separate enough for a disc to pass bewteen them, but the bottom of the chains do not whip apart as they should if they were truly free from each other.

Of course if no one at the scrimmage can confirm this set-up it must be my own imagination run a muck.