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by 13bridges
October 7th, 2011, 8:17 pm
Forum: 2012 Build Events
Topic: Sounds of Music C
Replies: 181
Views: 27454

Re: Sounds of Music C

The last time I did this event, we had to build a percussion and a wind instrument so I'm a bit unclear about building string instruments.

Am I able to use say, cello strings? Or does buying professional quality strings violate the rules?
by 13bridges
January 13th, 2010, 12:58 pm
Forum: 2010 Build Events
Topic: Elevated Bridge B/C
Replies: 1238
Views: 95520

Re: Elevated Bridge B/C

Wow. I'm surprised. I though invitationals would be a lot more competitive. But, I have watched some people try building bridges with arches. They don't seem to work that well this year, just because the clearance is so large (well, for divi. C). I saw that most of the breaking occurred in the middl...
by 13bridges
January 10th, 2010, 8:54 am
Forum: 2010 Build Events
Topic: Elevated Bridge B/C
Replies: 1238
Views: 95520

Re: Elevated Bridge B/C

Well, for starters, how are YOU doing? Second, I'd say that, judging by last year's scores (and this year's being about the same), over 1000 efficiency is good, and over 1500 is excellent. 2000+ will get you into the top few at nationals :D Additionally, the score tracker is a bit misleading, I thi...
by 13bridges
January 6th, 2010, 11:10 am
Forum: 2010 Build Events
Topic: Elevated Bridge B/C
Replies: 1238
Views: 95520

Re: Elevated Bridge B/C

I was wondering, how is everyone doing this year efficiency wise?
I find that this year, I've been struggling to get my bridges to do well. If you guys don't mind, can you post up some tests on the score tracker? This way, we cal all get a feeling about how we're doing.
Thanks :)
by 13bridges
December 9th, 2009, 6:48 pm
Forum: 2010 Build Events
Topic: Elevated Bridge B/C
Replies: 1238
Views: 95520

Re: Elevated Bridge B/C

does anyone have any good ways of not having your bridge twist when building? the best way to do this is probably to put either a block between the two sides when you build. also, you can try putting slight weight on the top of the bridge after few members are glued on. that way, the bridge stands ...
by 13bridges
October 25th, 2009, 6:41 am
Forum: 2010 Study Events
Topic: Ecology B/C
Replies: 270
Views: 29987

Re: Ecology B/C

I agree completely. I have been doing ecology for three years now and it is my top event since Awesome Aquifers left. :cry: I work very hard every year to get top and I think that the sheet makes the event too even of a playing field. I think that because of the sheet, the event will be even harder...
by 13bridges
October 25th, 2009, 6:34 am
Forum: 2010 Build Events
Topic: Elevated Bridge B/C
Replies: 1238
Views: 95520

Re: Elevated Bridge B/C

I have discovered that I use graph paper not for the boxes, but as a reference when I draw my lines. The lines help me build my beams parallel, but otherwise, I have no use for the actual sizes of the squares. Because of this, i usually buy a ghostline tri fold. I use the faint lines they have to dr...
by 13bridges
October 22nd, 2009, 12:34 pm
Forum: 2010 Build Events
Topic: Elevated Bridge B/C
Replies: 1238
Views: 95520

Re: Elevated Bridge B/C

The top member is going to be in compression. The outside members of the legs are also going to be in compression, probably a good amount too. You want lateral bracing throughout the entire distance of your compression members. Straight, horizontal pieces are not effective lateral bracing. X's are....
by 13bridges
October 21st, 2009, 5:55 pm
Forum: 2010 Build Events
Topic: Elevated Bridge B/C
Replies: 1238
Views: 95520

Re: Elevated Bridge B/C

The pictures are uploaded under the bridge building section...I didn't see the "Elevated Bridge" category until I was done uploading them...sorry. The two horizontal members at the top were put in to hold the legs from expanding outward....I think that means tension. The load block was placed in the...
by 13bridges
October 21st, 2009, 4:58 pm
Forum: 2010 Build Events
Topic: Elevated Bridge B/C
Replies: 1238
Views: 95520

Re: Elevated Bridge B/C

I'm uploading the pictures but it might take some time.
These are post testing so you can see where the breakage was.
Also, photography isn't my high point so I hope you can see whats going on.

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