Prototype data

[Camren]

Hello chief delphi community,

Tonight we got the testing finished on our shooting prototype. its the half circle design. I have published the data here;
DATA

please take a look at the comments for some notes on the data

Thanks
-C

[nathan_hui]

There's not a whole lot of data, but it's some good data.

What exactly is Vertical Spread Up and how is that different from Vertical Spread Down? Same for the left/right designation.

[GBilletdeaux930]

If I were to guess, it'd be the deviation between all the shots from the mean?

What I'm seeing, is that the rubber wheel at the higher rpm was the only one that's variation was small enough to fit within the top goal every time.

[nathan_hui]

Also what would be nice is to see pics of the prototype used, so that we have an understanding of the exact conditions of the experiment.

[ehochstein]

Originally Posted by nathan_hui

Also what would be nice is to see pics of the prototype used, so that we have an understanding of the exact conditions of the experiment.

http://www.youtube.com/watch?v=ThZCOtjVJmw for a video of our shooter.

Enlarge the picture by clicking on it. You can see the different results via different colored markers or an "X" on the tape.

An X indicates 8inch rubber w/ rubber tread (plaction)
Black (lower left) indicates 8inch rubber w/ rubber tread (plaction)
Blue (lower right) indicates 8 inch Pnuematic


Image showing the results

[nathan_hui]

All I have to say is... okay...

Could you explain the numbering?

[ehochstein]

Originally Posted by nathan_hui

All I have to say is... okay...

Could you explain the numbering?

I edited my previous post with that info. Should be above the image. I am about 99% sure that the info is correct. I was in the other half of the room while this was going on.

[nathan_hui]

The spread's going the wrong way (it's 90 degrees to the ideal spread, which is a landscape oriented rectangle). I'm wondering if the feed was done by a machine, would the spread go down? Also, did the one dimple on the wheel make a difference (i.e. would a better made wheel have improved performance by a significant amount)?

Also, I hope these refrigerator targets weren't used in that hall with that trajectory - that would invalidate the entire data set.

[ehochstein]

Originally Posted by Wiifi

I edited my previous post with that info. Should be above the image. I am about 99% sure that the info is correct. I was in the other half of the room while this was going on.

We'll have to check out some of those questions tomorrow!

We had the test set up much like it looks in this video. (not in the hallway) http://www.youtube.com/watch?v=iHElJFyGW6Y

[Camren]

Alright the all in on answering post

The test set up was a fridge set up 24' 9" away from the fixed shoot roughly at 35 degrees from the table that was standing up about 2 feet from the ground.

Spread was determined based off of an point of best fit. then from the point we measure out to the farthest up, down, left and right hit.

Why is there not higher rpm pneumatic wheel test: First reason the wheel in my opinion one wasn't balanced and two didn't have the right fit to the bead, causing lots of vibration and for safety reasons we cut it off at 3500 rpm. Secondly we were happy with the accuracy of pneumatic wheel at 3500 rpm. the 80 rpm test on the treaded wheel came about after an odd spread at 3500 rpm.

In addition to Evans posts above the 12" and 0" circled were benchmarks to see how it would fly into the 3 point goal.

[nathan_hui]

Hmm. Humans downrange of the shooter. Cannon fodder much?

Now that I think about it, try clamping the shooter to a table and weighing the table down as much as possible so that the shooter doesn't jerk around.

[Camren]

Originally Posted by nathan_hui

Hmm. Humans downrange of the shooter. Cannon fodder much?

Now that I think about it, try clamping the shooter to a table and weighing the table down as much as possible so that the shooter doesn't jerk around.

All member down range of the Frisbee launcher have Ultimate Frisbee training. Do not try at home.....

[DonRotolo]

OMG that poor Fridge!

[ehochstein]

Originally Posted by DonRotolo

OMG that poor Fridge!

Not as bad as what we did today.... We put tape all over the entire thing to calculate velocity of the frisbees. Needed a way to trigger limit switches! I will have more data to post on the velocity come Monday.

[Camren]

Originally Posted by DonRotolo

OMG that poor Fridge!

We were losing too many rookies to injury. so we picked the fridge for target practice