Air Trajectory B/C

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Re: Air Trajectory B/C

Postby windu34 » September 24th, 2015, 8:13 am

Im just stating what i believe to be the purpose. Its likely nobody at nats used the graphs the way i described
Right, I understand. This is why I said we disagree. But that is OK :)

I just got the new rules and there is a little less room to make adjustments between shots. And less height to drop the weight. I'm pretty sure our design from last year will not work with the rule changes. I guess that is their intent.
Yeah. Its gonna be tough with the new height restriction
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Re: Air Trajectory B/C

Postby N_Selwa » September 30th, 2015, 12:17 pm

can u use a counter wieght for air trajectory in division b

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Re: Air Trajectory B/C

Postby laidlawe18 » September 30th, 2015, 1:03 pm

What do you mean by a counter weight?

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Re: Air Trajectory B/C

Postby bernard » September 30th, 2015, 1:30 pm

can u use a counter wieght for air trajectory in division b
How are you using it? If you use a weight on your device to stabilize it and it does not contribute to the launch force, then it should be allowed. Disclaimer that this isn't the place for official clarifications.
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Re: Air Trajectory B/C

Postby Sidvin » September 30th, 2015, 5:29 pm

Hey guys, can anyone please recommend how to make a piston for putting inside the pipe to hit the ping pong ball and also please tell me what I can make it out of very detailed-ly?
Thanks,

Sid
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Re: Air Trajectory B/C

Postby windu34 » September 30th, 2015, 6:37 pm

Hey guys, can anyone please recommend how to make a piston for putting inside the pipe to hit the ping pong ball and also please tell me what I can make it out of very detailed-ly?
Thanks,

Sid
:)
Do you have access to a 3-D printer?
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Re: Air Trajectory B/C

Postby bernard » September 30th, 2015, 9:58 pm

Hey guys, can anyone please recommend how to make a piston for putting inside the pipe to hit the ping pong ball and also please tell me what I can make it out of very detailed-ly?
Thanks,

Sid
:)
O-ring around a plastic part, which can be easily designed and 3D printed if you have access to that. If not, try 3 disks: 2 a bit larger and 1 a bit smaller in diameter. Drill a hole down the middle of all disks, sandwich in this order through a threaded rod: large, smaller, large; the o-ring goes around the smaller one. Use nuts/washers to fix the disks in place. I can make a diagram in a day if this isn't clear. And use lubrication. You might need 2 pistons on a rod (kind of like a barbell) so the piston only moves linearly...
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Re: Air Trajectory B/C

Postby Argus » October 1st, 2015, 1:13 pm

Has anyone seen a successful device using a piston? I'm sure it is possible but i havent seen a really good one at a competition and if anyone did use one what kind of scores did you get?

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Re: Air Trajectory B/C

Postby bernard » October 1st, 2015, 3:39 pm

Has anyone seen a successful device using a piston? I'm sure it is possible but i havent seen a really good one at a competition and if anyone did use one what kind of scores did you get?
We used a bike pump last year, which involves a piston, not made by us though. It can work quite consistently. And a bonus is that all the parts are made in factories so they are close enough to perfect.
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Re: Air Trajectory B/C

Postby brayden box » October 7th, 2015, 9:08 am

Last year we used a piece of PVC pipe, about 5 inches tall, filled it with rocks, and used air pressure, dropping it down another bigger PVC pipe. Looks like it will be a lot harder than it was last year.
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Re: Air Trajectory B/C

Postby windu34 » October 12th, 2015, 8:52 am

In regards to air flow, are you guys "popping" it or letting the air flow at a continuous rate?
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Re: Air Trajectory B/C

Postby brayden box » October 12th, 2015, 10:39 am

Kind of both. It is continuous for a very short time, yet still it is kind of popping it.
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Re: Air Trajectory B/C

Postby windu34 » October 12th, 2015, 5:18 pm

Kind of both. It is continuous for a very short time, yet still it is kind of popping it.
Hows your accuracy/precision?
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Re: Air Trajectory B/C

Postby DoctaDave » October 12th, 2015, 7:27 pm

Speaking of precision and accuracy, whats considered to be good for a device? Is 10cm deviance from the target good? 20?

How did the top teams at nationals do last year?

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Re: Air Trajectory B/C

Postby windu34 » October 12th, 2015, 7:35 pm

Speaking of precision and accuracy, whats considered to be good for a device? Is 10cm deviance from the target good? 20?

How did the top teams at nationals do last year?
1st place got a perfect score and both bucket shots if I'm not mistaken. A competitive device should be within a few centimeters; a really competitive device should be within a centimeter. (This of course varies at different levels of comp. where 10cm might be good at regionals, but bad at nats or states)
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