Air Trajectory B/C

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Air Trajectory B/C

Postby robotman » August 22nd, 2015, 2:36 pm

Discussion for Air Trajectory B/C.

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Argus
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Re: Air Trajectory B/C

Postby Argus » September 2nd, 2015, 7:34 am

Anyone have any clue what is new for this year?

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Re: Air Trajectory B/C

Postby chalker » September 2nd, 2015, 4:33 pm

Anyone have any clue what is new for this year?

Yes;) Might as well give a high level summary of major changes since this is in my committee. As always though, you really need to read the actual rules to understand the specifics:

-Nominal mass items like strings / container walls aren't considered part of the falling mass
-Max device size reduced: 70cm cube C, 80cm cube B
-Foam golf balls allowed
-Launch area size reduced: 1m square
-Far target can be up to 2m right or left of the centerline
-Bucket shot max points increased to 300

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Re: Air Trajectory B/C

Postby sciolylover13 » September 2nd, 2015, 4:36 pm

Anyone have any clue what is new for this year?

Yes;) Might as well give a high level summary of major changes since this is in my committee. As always though, you really need to read the actual rules to understand the specifics:

-Nominal mass items like strings / container walls aren't considered part of the falling mass
-Max device size reduced: 70cm cube C, 80cm cube B
-Foam golf balls allowed
-Launch area size reduced: 1m square
-Far target can be up to 2m right or left of the centerline
-Bucket shot max points increased to 300
Guess that means I have to start working on my bucket shot aiming skills!!
Oh and my angles.
Yay! Time to start working on my device and do countless hours of repetitive monotonous practice to get the ball in one spot!!
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Re: Air Trajectory B/C

Postby Argus » September 2nd, 2015, 4:51 pm

Anyone have any clue what is new for this year?

Yes;) Might as well give a high level summary of major changes since this is in my committee. As always though, you really need to read the actual rules to understand the specifics:

-Nominal mass items like strings / container walls aren't considered part of the falling mass
-Max device size reduced: 70cm cube C, 80cm cube B
-Foam golf balls allowed
-Launch area size reduced: 1m square
-Far target can be up to 2m right or left of the centerline
-Bucket shot max points increased to 300
My rule manual is coming in tommorow haha. I just am super impatient and excited to start. The 70cm cube size restrictions will probably be the most difficult part but it can definitely be done. Thank you very much for the info I can't wait to start building!!!!!

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Re: Air Trajectory B/C

Postby windu34 » September 2nd, 2015, 7:42 pm

Any plans on how to adapt to the size restrictions? Also what kind of pvc do you use? Thin walled?
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Re: Air Trajectory B/C

Postby windu34 » September 12th, 2015, 7:33 pm

Do you guys use physics to calculate exactly how far and what force is needed to launch the projectile or do you just test it?
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Re: Air Trajectory B/C

Postby daycd » September 13th, 2015, 7:02 pm

Just test. The important thing is that your machine is consistent.

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Re: Air Trajectory B/C

Postby bernard » September 13th, 2015, 7:22 pm

Just test. The important thing is that your machine is consistent.
Exactly the approach we use for this event and many other builds. If you're starting out and aren't sure if something will work, just test the main step(s) that might not work. If you're dropping a mass onto a bottle, you probably don't need to make a contraption that drops the mass yet. And if something just barely works, there's a chance it won't work under slightly different conditions.
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Re: Air Trajectory B/C

Postby windu34 » September 13th, 2015, 7:32 pm

Actually this will be my second year with this event and I have a lot of experience. Last year, I only tested to achieve my results and placed second at state, but this year, I am in physics and have started wondering if there would be a way to actually calculate the initial velocity that I would need for each launch and then quantify the force produced by my device into an initial velocity that I could use as a variable.
I think there is a ratio that relates the effect of air resistance to distance that I could find and employ
Thoughts?
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