Trajectory B/C

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sj
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Re: Trajectory B/C

Postby sj » April 14th, 2010, 6:03 pm

So far we have only calibrated for the ground target but we should be able to hit the raised target with no problem
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Re: Trajectory B/C

Postby zyzzyva980 » April 14th, 2010, 6:08 pm

Raised target can be practically anywhere, you know...
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Re: Trajectory B/C

Postby starpug » April 14th, 2010, 6:13 pm

zyzzyva98 wrote:Raised target can be practically anywhere, you know...

Actually not, I can name quite a few places it can't be...

It's pretty straight forward really, once you know the physics of the event that is.
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Re: Trajectory B/C

Postby RndmPplPrsn » April 14th, 2010, 6:16 pm

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Re: Trajectory B/C

Postby sj » April 15th, 2010, 6:14 pm

could you elaborate on how we could use kinematics because so far we have been testing extensively however it seems impractical to calibrate for all the points that are possible.
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Re: Trajectory B/C

Postby Phenylethylamine » April 16th, 2010, 3:41 pm

NIXINATOR wrote:my catapult has so much force behind it that when using a pin it pulls the whole catapult with it
any ideas for another release mechanism? :ugeek:

Our release mechanism is a little hard to explain... it doubles as our tension adjustment.
Essentially, we have our catapult arm, which has a little metal tab sticking out at the end; it pulls back, and slots under the rim of a large washer that's held on a threaded rod (which stands vertically at the back of the device) by two wingnuts. This threaded rod is attached at the bottom to an axle, and to launch, you just pull back the threaded rod like a lever, pulling the washer out of the way of the tab and letting the arm swing forward. To adjust tension, you move the washer up or down the rod. There's a small bungee cord behind the rod, so when you let go of it after launch, it springs back into place to avoid being out of specs.
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Re: Trajectory B/C

Postby colombiano » April 19th, 2010, 6:16 pm

i don't know if this has ever happened to any of you, but we were testing the other day and we happened to try another tennis ball and the distance achieved was way off. So we looked into it trying many different tennis balls and they all got different distances. These balls were almost the same mass and same brand but they launch really different. Why do you think this is? When we use the same tennis ball it is really consistent.
So now we have to stick with one ball and hope nothing happens to it :shock:
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Re: Trajectory B/C

Postby anon y mouse » April 19th, 2010, 7:12 pm

I don't know the reason why similar balls from the same pack preform differently, but I have observed the same phenomenon.

Does anyone have a good explanation?

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Re: Trajectory B/C

Postby starpug » April 19th, 2010, 7:43 pm

anon y mouse wrote:I don't know the reason why similar balls from the same pack preform differently, but I have observed the same phenomenon.

Does anyone have a good explanation?

If you are using any sort of lubrication on the area where the ball is then the ball you use a lot might have some residue on it that causes it to move a little freer

You could also in the tennis ball case have more or less fuzz on the ball.

I guess the ball making process isn't perfect :/ if all else fails
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Re: Trajectory B/C

Postby zyzzyva980 » April 20th, 2010, 8:33 am

We've noticed the same thing with our tennis balls. We labeled them to avoid confusion. There's not much you can really do about it, unless you know someone in the tennis ball-making industry.
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Re: Trajectory B/C

Postby Phenylethylamine » April 20th, 2010, 2:19 pm

We've been using racquetballs, and they seem to be pretty much consistent from one ball to another. We did have some issues with them softening over time, though, but since we haven't seen any difference between individual racquetballs, now we just rotate through several to minimize wear.
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Re: Trajectory B/C

Postby colombiano » April 20th, 2010, 3:19 pm

zyzzyva98 wrote:We've noticed the same thing with our tennis balls. We labeled them to avoid confusion. There's not much you can really do about it, unless you know someone in the tennis ball-making industry.

yeah we had to label them as well
and yeah i don't know any one in the tennis ball making industry so... :|
we'll just have to use the same ball all the time
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Re: Trajectory B/C

Postby haven chuck » April 20th, 2010, 6:12 pm

starpug wrote:
anon y mouse wrote:I don't know the reason why similar balls from the same pack preform differently, but I have observed the same phenomenon.

Does anyone have a good explanation?

If you are using any sort of lubrication on the area where the ball is then the ball you use a lot might have some residue on it that causes it to move a little freer

You could also in the tennis ball case have more or less fuzz on the ball.

I guess the ball making process isn't perfect :/ if all else fails


Also, you should be careful about lubricating the ball too much, since the rules call for an "unmodified.......". While this probably wouldnt be a problem, there might be an event supervisor who will get all butterfly over a slightly different ball.
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Re: Trajectory B/C

Postby starpug » April 20th, 2010, 6:13 pm

haven chuck wrote:
starpug wrote:
anon y mouse wrote:I don't know the reason why similar balls from the same pack preform differently, but I have observed the same phenomenon.

Does anyone have a good explanation?

If you are using any sort of lubrication on the area where the ball is then the ball you use a lot might have some residue on it that causes it to move a little freer

You could also in the tennis ball case have more or less fuzz on the ball.

I guess the ball making process isn't perfect :/ if all else fails


Also, you should be careful about lubricating the ball too much, since the rules call for an "unmodified.......". While this probably wouldnt be a problem, there might be an event supervisor who will get all butterfly over a slightly different ball.

Well you don't lubricate the ball, you lubricate the pvc pipe the ball passes through
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Re: Trajectory B/C

Postby wlsguy » April 20th, 2010, 8:04 pm

NIXINATOR wrote:my catapult has so much force behind it that when using a pin it pulls the whole catapult with it
any ideas for another release mechanism? :ugeek:


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You may want to check out our device. It uses a mousetrap to pull the pin and this eliminates the movement from the launch. Check the image gallery


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