2583's prototype shooter

[ferrari77]

Yeah its about the size of an FRC field, its probably the camera angle and the fact that the guy is pretty tall

We wont be shooting that far in the game and over about 20 or 30 feet is it very highly accurate

[androb4]

Really nice! Have you guys tried shooting at a higher angle?

[jeremy callahan]

Originally Posted by androb4

Really nice! Have you guys tried shooting at a higher angle?

i am having the same question as this guy im wondering if you put it on an angle will the frisbee have a different reaction?

[ClearlyInvsible]

I think you guys may want to try and amp the power up a bit, for increased range.

Otherwise, bang up job!

[BurkeHalderman]

How much compression do you have on the disk?

[Tem1514 Mentor]

Originally Posted by BurkeHalderman

How much compression do you have on the disk?

That is a good question and if you watch the video closely you will see the clear wall moving as the frisbee goes by. I am just guessing but once that wall becomes fixed your results will change and I'm thinking not for the better, but who knows, I could be wrong.

[CalTran]

What was the RPM of the CIM? Was there any reduction off the CIM, or was it straight direct dirven off of it? For this prototype, was it just battery->cim->wheel->frisbee?

[ferrari77]

To answer a few questions

The shooter was about waist high, so 3 or 4 ish feet off the ground and it was angled up with just a 2x4 under the front

The wheel is direct driven by the CIM and just directly hooked to a battery. I believe this leads to around 4000 RPM

At first we cut the wood circle and placed it exactly 11 inches away from the wheel
Then we added two polycarbonate sheets, each 1/8 in thick to the inside of the curve. So we ended up with only about 1/4 in of compression

We were wondering how changes in RPM vs compression would change the trajectory and we found that using a half dead battery, so a lower RPM, the frisbee only flew marginally less distance and was stills table. However, removing just one 1/8 in sheet of polycarbonate caused the frisbee's range to drop from 50 to about 10 feet.

We will be trying a higher angle soon, however based on other videos, including the Robot in 3 Days robot, shooting at a higher angle will still work

[Kusha]

Originally Posted by ferrari77

To answer a few questions

The shooter was about waist high, so 3 or 4 ish feet off the ground and it was angled up with just a 2x4 under the front

The wheel is direct driven by the CIM and just directly hooked to a battery. I believe this leads to around 4000 RPM

At first we cut the wood circle and placed it exactly 11 inches away from the wheel
Then we added two polycarbonate sheets, each 1/8 in thick to the inside of the curve. So we ended up with only about 1/4 in of compression

We were wondering how changes in RPM vs compression would change the trajectory and we found that using a half dead battery, so a lower RPM, the frisbee only flew marginally less distance and was stills table. However, removing just one 1/8 in sheet of polycarbonate caused the frisbee's range to drop from 50 to about 10 feet.

We will be trying a higher angle soon, however based on other videos, including the Robot in 3 Days robot, shooting at a higher angle will still work

What wheel did you guys use? It looks like a lunacy wheel.

EDIT: I read the other posts more carefully, it's a 6" KOP wheel from this year. Sorry for not reading.

[Ether]

Originally Posted by ferrari77

The wheel is direct driven by the CIM and just directly hooked to a battery. I believe this leads to around 4000 RPM

Once up to speed, the only external load on the CIM is windage and vibration due to unbalanced wheel. At 12 volts and 4000 rpm, the CIM would be drawing 34 amps and generating 250 watts of output power at the shaft. If you guys have a clamp-on ammeter, it would be most interesting to see what the current draw actually is.

Originally Posted by ferrari77

We were wondering how changes in RPM ... would change the trajectory and we found that using a half dead battery, so a lower RPM, the frisbee only flew marginally less distance and was stills table.

Not sure what you mean by a "half dead" battery.

Do you plan to do closed-loop control of wheel speed? If so, when you get the speed sensor mounted you could provide some useful data to the CD community showing how rpm affects the frisbee flight path.

[androb4]

Originally Posted by Ether

If so, when you get the speed sensor mounted you could provide some useful data to the CD community showing how rpm affects the frisbee flight path.

I'd love to see some useful data too!

[ferrari77]

here is the second version of our frisbee shooter

We have our CIM directly mounted to a 6 inch White KOP wheel from 2013

The wall is two pieces of 1/16 in sheet metal mounted at two points causing compression of about 1/4 in

We are shooting at a 30 degree angle, and the axle of the wheel is 120 inches from the Alliance Wall

This is around where the base of the pyramid is because our plan is to back up into the pyramid so that we always have the same position, similar to how teams used the fender last year

http://www.youtube.com/watch?v=EjK6m...ature=youtu.be

[ttldomination]

Originally Posted by ferrari77

here is the second version of our frisbee shooter

We have our CIM directly mounted to a 6 inch White KOP wheel from 2013

The wall is two pieces of 1/16 in sheet metal mounted at two points causing compression of about 1/4 in

We are shooting at a 30 degree angle, and the axle of the wheel is 120 inches from the Alliance Wall

This is around where the base of the pyramid is because our plan is to back up into the pyramid so that we always have the same position, similar to how teams used the fender last year

http://www.youtube.com/watch?v=EjK6m...ature=youtu.be

Is it just me or does it sound like your wheel is experiencing some fairly drastic slow down?

- Sunny G.

[Hallry]

Originally Posted by ferrari77

Yeah its about the size of an FRC field, its probably the camera angle and the fact that the guy is pretty tall

We wont be shooting that far in the game and over about 20 or 30 feet is it very highly accurate

How high was the shooter off the ground?