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lllazar wrote:Can a bridge really way only 5g?....i mean is it even possible given the dimensional requirements?

it was an example. but I think with last years specs, a lot of bridges got very close. like 8 grams or so.

sewforlife wrote:

lllazar wrote:Can a bridge really way only 5g?....i mean is it even possible given the dimensional requirements?

it was an example. but I think with last years specs, a lot of bridges got very close. like 8 grams or so.

Though it IS possible to get down to a mass that low, 8 grams is no where near 5 grams, seeing how once your bridge gets lighter it gets more and more difficult to be successful. To put it in perspective, an 8 gram bridge holding all 15kg would get a 1875 efficiency while a 5 gram bridge would get 3000.

Last year, our school got 1st in elevated bridge at regionals....the bridge got an efficiency of 540 or something.....i think with all the help im getting from this site, i can hit at least the 700 mark =D

lllazar wrote:Last year, our school got 1st in elevated bridge at regionals....the bridge got an efficiency of 540 or something.....i think with all the help im getting from this site, i can hit at least the 700 mark =D

good luck. and don't forget to ask questions. we tested three bridges, and they all yielded disappointing results. the highest efficiency is a 430.

Just remember, you can never fail as badly as my school's high school team. At Regionals (literally at the competition), they built a bridge out of the spare 1/32 wood from Wright Stuff. Needless to say, I don't think it even held the bucket.

Also, it can never hurt to quadruple-check your bridge to make sure it falls within the specs. (A little OCD helps here.) Last year at States, I saw the team in front of me get second tiered because their bridge was just barely over the 15cm max height. The really bad part was when I watched them test, I could tell that they probably would have gotten a pretty good score too.

AlphaTauri wrote:Just remember, you can never fail as badly as my school's high school team. At Regionals (literally at the competition), they built a bridge out of the spare 1/32 wood from Wright Stuff. Needless to say, I don't think it even held the bucket.

now that seems bad. last year at regions, we had to tune up our bridge, and the glue wasn't even dry when we tested. but it held the bucket (to our surprise)

one time at an invitational we had to build a bridge that barely meet the specs from peices leftover from the original bridge after smeone sat on it!!!

I built the first side of my first bridge today. I kinda like how it's looking so far. I think I'm gonna enjoy playing around with the Div. C specs.

I just tested my div. B bridge today.
The mass: *edit: 12
It held: 8.5 kg
Approximate efficiency: 708.
I really like the design, it's pretty simple and light, with one piece in the middle that is two 1/8 by 1/8 sticks laminated, so it is a 1/4 by 1/8 piece. That is the main structure. My bridge basically broke in the center on one side, where the glue started to separate on that laminated piece. I'm happy by the results. I think a 700 efficiency could get me at least a 3rd place in New Jersey, by what I've seen for the past years.
edit: tell me what you think! SORRY. it was 12 grams, not 8

sewforlife wrote:I just tested my div. B bridge today.
The mass: 8 grams
It held: 8.5 kg
Approximate efficiency: 708.
!

The efficiency of your bridge is 8500/8 = 1062.5