Elevated Bridge B/C

bob3443
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Re: Elevated Bridge 2009

Postby bob3443 » January 14th, 2009, 5:01 pm

I find trying to make any sort of arch in the wood isn't worth it.
at my regionals in divison C more than half the bridges were arches, in divison B there were about 5 arch bridges(out of 20)
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Pleiades
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Re: Elevated Bridge 2009

Postby Pleiades » January 14th, 2009, 5:05 pm

do you know what kinds of efficiencies they were getting?

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Re: Elevated Bridge 2009

Postby bob3443 » January 14th, 2009, 5:23 pm

not sure but i know the winner was at least 1000... i think... i'll ask the others... if i remember.
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Re: Elevated Bridge 2009

Postby elau0493 » January 14th, 2009, 5:50 pm

hi guys, i'm a newbie here xP and i was just wondering, how do you guys like test your bridge? where do you get the loading block? etc. my team is sort of a mess right now cuz the coach is new and he doesn't really know exactly what to do. >.<

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Re: Elevated Bridge 2009

Postby bob3443 » January 14th, 2009, 6:34 pm

you can make a loading block its a 5cm x 5cm x 1.25cm piece of wood with a metal chain hanging down from it, then you put a 5 gallon bucket to the end of the chain and add sand to it.
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Re: Elevated Bridge 2009

Postby elau0493 » January 14th, 2009, 6:47 pm

you can make a loading block its a 5cm x 5cm x 1.25cm piece of wood with a metal chain hanging down from it, then you put a 5 gallon bucket to the end of the chain and add sand to it.

ohhh. so do you just like screw a hook in the block?? i've seen like other ppl test there's with a metal plate, do you know where i can get one of those?? :?

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Re: Elevated Bridge 2009

Postby smartkid222 » January 14th, 2009, 6:54 pm

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except the block is supposed to have 2cm thickness
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Re: Elevated Bridge 2009

Postby andrewwski » January 14th, 2009, 8:04 pm

I just used a piece of 3/4" plywood to make my block. Specs say it will be 2.0 cm thick, 3/4" plywood is 1.9" so that is pretty close. Cut it to 5.0 cm x 5.0 cm on a table saw, then drilled a hold in it and out in an eyebolt and washers as per the description.

It's the same block I used for Boomilever last year. Took less than 15 minutes to build.

Thickness won't matter for the block as long as it should distribute the weight to the bridge the same. Just make sure if the block is going in the bridge that the entire 2.0 cm block could fit, plus protrusions at the top where the eyebolt is held with a nut.

Trip to your hardware store or school's shop room should be all you need.

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Re: Elevated Bridge 2009

Postby elau0493 » January 15th, 2009, 1:48 pm

I just used a piece of 3/4" plywood to make my block. Specs say it will be 2.0 cm thick, 3/4" plywood is 1.9" so that is pretty close. Cut it to 5.0 cm x 5.0 cm on a table saw, then drilled a hold in it and out in an eyebolt and washers as per the description.

It's the same block I used for Boomilever last year. Took less than 15 minutes to build.

Thickness won't matter for the block as long as it should distribute the weight to the bridge the same. Just make sure if the block is going in the bridge that the entire 2.0 cm block could fit, plus protrusions at the top where the eyebolt is held with a nut.

Trip to your hardware store or school's shop room should be all you need.
Thanks so much! :)

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Re: Elevated Bridge 2009

Postby Pleiades » January 15th, 2009, 2:42 pm

would a piece of plywood that is sanded down so it is somewhat smooth be ok for a testing base?


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