Full Court Shooting: Over 80ft total distance

[MelodyPond]

The Secret City Wildbots tested our next generation shooter this week. We were able to get over 80' total distance (When the disks hit the ground). When the disks flew past the 54' mark they were approx. 12' in the air. We're using a flywheel design with an 8" wheel being driven by a CIM with a 1:1.2 transmission.

Here's some videos!

http://www.youtube.com/watch?v=56I7sbeFz-U

http://www.youtube.com/watch?v=d7PFY..._ec8PQ&index=1

http://www.youtube.com/watch?v=8A6Ei...BzCxRwAS_ec8PQ

http://www.youtube.com/watch?v=I0OaV..._ec8PQ&index=3

[Nuttyman54]

Very impressive.

I would suggest that if you are shooting from close to the goal (like in the first two videos) you turn the speed down. They're going so fast I think they may bounce right back out of the goal (even with the chains to help). We saw this in 2006 where teams would shoot too hard and balls would hit the chains and bounce off.

[AdamHeard]

Precision and accuracy are far more important than distance.

[MelodyPond]

That's the next step! Thanks for keeping us on track. Today we added a guard to keep the disk from riding up on the wheel at the end. That way we don't curve quite as much. We're also working hard to master encoders and PIDs to monitor the motor speeds. We're going to keep on tweaking. Since we're only a second year team, those major programming tasks are quite a challenge to tackle. However, we aren't about to back down from a challenge!

[dudefise]

That's really impressive. What kind of wheel is that? Our team has had difficulties with wheel types so far.

[MelodyPond]

We're using an 8" aluminum plaction wheel with rubber wedgestock tread. However, in one of our tests the tread popped off, so we added extra pop-rivets.

[Madison]

Originally Posted by MelodyPond

We're using an 8" aluminum plaction wheel with rubber wedgestock tread. However, in one of our tests the tread popped off, so we added extra pop-rivets.

Can you provide a link to the wheel you're using? An '8" aluminum plaction wheel" isn't a real thing.

[WileyB-J]

Originally Posted by Madison

Can you provide a link to the wheel you're using? An '8" aluminum plaction wheel" isn't a real thing.

I believe he is referring to this: 8" Aluminum Plaction wheel

[Madison]

Originally Posted by WileyB-J

I believe he is referring to this: 8" Aluminum Plaction wheel

That's not a plaction wheel

http://www.andymark.com/Plaction-s/103.htm

Plaction is a portmanteau of plastic and traction.

[MelodyPond]

All terms aside, the wheel WileyB-J is referring to (http://www.andymark.com/product-p/am-0133wa.htm) is what we're using. Oh, and I'm a girl!

[Sean Raia]

This is alot like using a jackhammer to hammer a nail.
Your extra distance isn't worth much if the Frisbee veers off every time.

Still, it's cool to see those Frisbee's being shot with so much power.

[Kevin Sevcik]

Originally Posted by MelodyPond

That's the next step! Thanks for keeping us on track. Today we added a guard to keep the disk from riding up on the wheel at the end. That way we don't curve quite as much. We're also working hard to master encoders and PIDs to monitor the motor speeds. We're going to keep on tweaking. Since we're only a second year team, those major programming tasks are quite a challenge to tackle. However, we aren't about to back down from a challenge!

In other news, you really want to do bang-bang control for your shooter speed. It's simpler to program, easier to tune, and gets your flywheel up to speed much faster than a PID.

[WarehouseCrew]

1. What material are you using for the "fence" (curved wall that is on opposite side of Frisbee from the spinning wheel) in your shooter?
2. How much compression are you using?
3. Are you running your CIM at full speed (looks like you gear up the wheel to spin faster than the CIM)?
4. Any idea on the RPM of the wheel you are shooting with?

We are testing a similar design but not getting nearly the distance that you are. We don't want to shoot full court, but it may become necessary depending on how the game plays out.

Thanks.

[stundt1]

Originally Posted by AdamHeard

Precision and accuracy are far more important than distance.

I second this

[nikeairmancurry]

Originally Posted by stundt1

I second this

I third this..