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!
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.
Precision and accuracy are far more important than distance.
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!
That’s really impressive. What kind of wheel is that? Our team has had difficulties with wheel types so far.
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.
I believe he is referring to this: 8" Aluminum Plaction wheel :rolleyes:
That’s not a plaction wheel 
Plaction is a portmanteau of plastic and traction.
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! 
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.
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.
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.
I second this
I third this…
WOW! That is AWESOME YA’LL! Way to go. What kind of wheel are you using?
You all could make full court shots with no problem.
FTFY
I’ll agree with Adam. Like most things it doesn’t matter how much range you have if you can’t hit anything or if it bounces out all the time.
Could be cool for demos though.
For those asking for specs here is a description (we can take a close up of things if you’d like to add those as well).
8” performance wheels (hex shaft) with wedgetop tread (http://www.andymark.com/product-p/am-0105.htm)
Custom 1:1.2 up conversion modulox gearbox – using VexPro ceramic coated aluminum gears driven with a single CIM
Flywheel is a 10” plywood saw blade with the teeth ground off & attached to the aluminum performance wheel – it also acts as a guide to keep the Frisbee flat as it travels around the wheel
Bottom outside wall is made of aluminum angle back notched every 1” and pop riveted to the polycarbonate
We line the inside of the outer wall with wedgetop
Another piece of aluminum angle is added to keep the discs flat – rivets are used to attaché both the wedgetop and top angle to the base wall – in ends up looking like this:
Compression of the outer aluminum wall is 15” the added wedgetop makes it about 14 5/8”
We made 10 out of 10 shots from 18’ last night
We can document the RPM of the wheel and accuracy later as well as provide some close up photos