Scores B/C

hi im andrew
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Re: Scores B/C

Postby hi im andrew » Sat Apr 18, 2015 2:26 am

VA

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Re: Scores B/C

Postby someusername » Sun Apr 19, 2015 9:29 pm

hi im andrew wrote:I'm getting higher, but the crux of my design needs everything to be perfectly angled and pre-stressed, and i don't know if there will be any serious humidity change between my state and Nebraska, and thank you for your kind words.


I'm not 100% certain what the humidity is like here around that time. I know in the summer, it can be crazy humid (like 90%+) one week and then less than 10% the next week. But as far as mid may goes, it could go one way or the other. I would assume that if you pack it the way you normally do, you should be alright. But if you are really worried about it you could probably go the weather channels website and look it up. If i had to guess I wouldn't think the humidity would be anything worse than what Virginia's is.
simplicity is key...sometimes

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Re: Scores B/C

Postby sjwon3789 » Mon Apr 20, 2015 5:05 am

hi im andrew wrote:I actually don't know the following scores, but I do know that purely from design and joints none of the others could be over 2000.


Suppp I'm from VA. My friends received the following scores:

2nd - 1990
3rd - 1890
6th - 1400 or 1300.

Impressive for getting >3000! I'm glad you guys won instead of us (well I wasn't even chosen for states but my bridge was significantly better than the states...). I was working on a design that scored 2250 but I couldn't properly execute it. Sigh.

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Re: Scores B/C

Postby S4BB » Tue Apr 21, 2015 1:02 am

Back from Illinois State Tournament, and the team had their best score of the season, 3628, and it was good enough for 2nd place. Bridge was 4.1g, nothing left but the Bridge Burning Party.

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Re: Scores B/C

Postby 19sawickin » Wed Apr 22, 2015 11:35 am

hi im andrew wrote:I'm getting higher, but the crux of my design needs everything to be perfectly angled and pre-stressed, and i don't know if there will be any serious humidity change between my state and Nebraska, and thank you for your kind words.

I'm kind of new to Bridges and was wondering if CA glue and balsa combo is the way to go. Also I've seen a team pour very slowly before and their bridge held everything (although it took rather long to watch). Does ones pouring technique influence the efficiency of the bridge at all?

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Re: Scores B/C

Postby hi im andrew » Wed Apr 22, 2015 12:11 pm

I personally like to put rather fast, if you think about it, pouring slow has less initial force on the bridge, bu
t the bridge holds the weight for a longer amount if time.

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Re: Scores B/C

Postby 19sawickin » Thu Apr 23, 2015 7:37 pm

hi im andrew wrote:I personally like to put rather fast, if you think about it, pouring slow has less initial force on the bridge, bu
t the bridge holds the weight for a longer amount if time.

Ok. I have poured at pretty much a constant medium speed for most of the season but there is a member on my team that starts out very slowly and progressively builds up until he is pouring at full speed. I just thought that it seems logical to either pour extremely fast or extremely slowly.

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Re: Scores B/C

Postby JonB » Thu Apr 23, 2015 7:57 pm

19sawickin wrote:
hi im andrew wrote:I personally like to put rather fast, if you think about it, pouring slow has less initial force on the bridge, bu
t the bridge holds the weight for a longer amount if time.

Ok. I have poured at pretty much a constant medium speed for most of the season but there is a member on my team that starts out very slowly and progressively builds up until he is pouring at full speed. I just thought that it seems logical to either pour extremely fast or extremely slowly.


Your team member has it correct. First, load relatively slowly to let the structure "settle" and then load as fast as you can (while keeping the flow smooth) until it breaks or you reach 15kg.

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Re: Scores B/C

Postby 19sawickin » Thu Apr 23, 2015 8:00 pm

JonB wrote:
19sawickin wrote:
hi im andrew wrote:I personally like to put rather fast, if you think about it, pouring slow has less initial force on the bridge, bu
t the bridge holds the weight for a longer amount if time.

Ok. I have poured at pretty much a constant medium speed for most of the season but there is a member on my team that starts out very slowly and progressively builds up until he is pouring at full speed. I just thought that it seems logical to either pour extremely fast or extremely slowly.


Your team member has it correct. First, load relatively slowly to let the structure "settle" and then load as fast as you can (while keeping the flow smooth) until it breaks or you reach 15kg.

Thank you. Its seems to have worked for him so I guess Ill try that

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Re: Scores B/C

Postby PatrickMcPherson » Fri Apr 24, 2015 4:24 am

I load in the same manner, and it has worked fantastic. I've had to have tested at least 50 structures in that manner, and had no problems. Start slow, then open it up to WFO after you get set! Good luck!

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Re: Scores B/C

Postby sjwon3789 » Fri Apr 24, 2015 7:46 pm

But is it fine to pour super fast / dump all the sand in when you get to >10kg?

I just stick to medium fast in general, since I thought dumping the sand would be a bad idea.
If you look at the automatic loading machine though, I see that it takes 30 second to load everything (except the initial, where they start slow, I believe.)
2013 Events: Boomilever, Keep the Heat, WIDI
2014 Events: Boomilever, Geologic Mapping, Mission Possible, Scrambler
2015 Events: Air Trajectory, Bridge Building, Mission Possible

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Re: Scores B/C

Postby JonB » Fri Apr 24, 2015 8:28 pm

sjwon3789 wrote:But is it fine to pour super fast / dump all the sand in when you get to >10kg?

I just stick to medium fast in general, since I thought dumping the sand would be a bad idea.
If you look at the automatic loading machine though, I see that it takes 30 second to load everything (except the initial, where they start slow, I believe.)


As long as the rate gradually increases to the maximum rate then it should be fine. You want to avoid sudden, drastic increases is flow.

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Re: Scores B/C

Postby sciolycoach » Sat Apr 25, 2015 3:57 pm

Do keep in mind that many times people modify the lever-operated sand hopper to slow down the loading of the sand. Most hoppers I have seen take around 2 minutes to load all of the sand. The supervisor does this by limiting the flow of the sand from the hopper into the tube; this does tend to make it a bit more complicated for some teams and make it much easier for the supervisor to score the event as less sand is flowing per unit time so if the student pulling the lever delays a bit (very rare, I haven't seen that much as kids usually are surprised by the shock of the break and let go of the lever and it is spring loaded to shut the sand flow off) there isn't much difference in the weight held.

Just my 2 cents as you shouldn't necessarily plan on 30 seconds to hold all the weight...it may be more at some tournaments.
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Re: Scores B/C

Postby PatrickMcPherson » Sat Apr 25, 2015 11:44 pm

North Carolina C Division. 2455 6.06g 14.88kg

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Re: Scores B/C

Postby bernard » Sun Apr 26, 2015 2:31 am

PatrickMcPherson wrote:North Carolina C Division. 2455 6.06g 14.88kg

Congrats on a wonderful score! And it broke right before 15kg, so you planned well! :)
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