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)I find trying to make any sort of arch in the wood isn't worth it.
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.
Thanks so much!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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