HI, I had a question on the arches and tunnels. Is there any information on what exactly is expected of these structures? For example, would the arches be free-standing, or as part of a bridge for example? If the primary dimension of the tunnel is the longest portion of covered part, then what is its base? Anyone have any ideas?
Second this question. After coaching this event last year, I am a hard time visualizing the structures for this year:
What is the difference between an ELEVATED bridge and last year? Is it that this year they are going to always add the hight to the primary measurement vs. just the length?
For the Arch, is this really the same as a bridge but measuring to the apex of the bottom supports?
For the Tunnel, I can't imagine how this may be run. Seems to me the only limiting factor is the "covering" that will be used to enclose the tunnel. But understand how this will be differentiated if there is no load.
Yes I know part of the challenge of the event are the unknows - but without having some understanding of the types of builds, it is very hard to practice and know what to learn.
Thanks for any insight.
For tunnels - are support posts allowed? Is it basically a series of arches connected by support beams on top (like a tunnel camping tent pole structure)? Can you have a support post go down the middle of the tunnel?
As always, it depends on who is running the event and how they define the measurements but I DO NOT think this tests the intent of a tunnel. We recently practiced a tunnel and I have them structural materials (straws) and non-structural materials (grocery bags) with the primary measurement being: The longest enclosed tunnel that can pass a tennis ball through it. I impaled a tennis ball on a dowel so to use for testing.
Here is the actual write-up. I considered the table as part of the enclosure meaning the bag did not need to be on the bottom:
Create the longest tunnel that can fit a tennis ball all of the way through it. The tunnel cannot be secured to the table and must be fully enclosed. Materials:
• 2 grocery bags
• 40 straws
• masking tape
Primary measurement: Longest length of the tunnel that can fit the tennis ball
Secondary measurement: Diameter of the smallest section of the tunnel