Bridging the Gap...

The three hundred millimeter gap, to be precise.
Ok, Ben and Steve, I have some more work for you. :D If you don't feel like exerting your brain, though, don't worry.

I am liking Ben's suggestion about my trouble joint the more I think about it.

First of all, here's a picture of my shorter design.
















The members are marked in black, and the joints are marked in red.
Basically with the "problem joints" (joints 1 and 5), I'm thinking I should glue members 1 and 2 on top of member 6. Of course, I will have to put a little block of wood in there to fill in the gap. You might be able to see what I mean from the pictures. The turquoise member is member 1, the yellow member is member 3, the purple/blue member is member 6, and the little red member is the little block of wood to fill in the gap.
















I hope you appreciated that picture; it took me a lot of effort to try to get it to look right. The yellow member isn't quite right still...

The next picture is what the joint would look like if you looked down the length of the bridge.
































Sorry about the blue and red members; I think I will put the blue member right next to the yellow one, just so the yellow member can have more direct contact with the blue member. I guess that means that my first drawing is wrong.

This afternoon I got out all my old bridges to see what similarities in design I could find. Last year's bridge deals with my joint 1 problem.

















As you can see, the long members across the bottom just snapped off the long members going up to the loading point.
















This bridge is from two years ago, and it actually won first place! And once again, that trouble joint is what made it fail.















The long members across the bottom snapped off of the long members going up to the loading point. The interesting thing to note about this bridge is that it is asymmetrical. The loading point is offset from the center of the span, like this year's bridge. On this bridge, however, the loading point is offset by 100 mm, and this year's bridge is only offset by 50 mm.
This bridge failed on the shorter side, the side with the greatest angle, and the side with the most load. This will be true of this year's bridge as well.





















So, to sum it up, I think putting members 1 and 2 on top of member 6 will definitely help my problem. I'm still thinking about how members 3 and 4 will fit into the picture.... (not literally)

This next bridge is from my first year at the bridge contest. Actually, it's the bridge I sent to the international contest, and yes, the bridge is broken in the picture, and no, you're not seeing what I actually sent in. Some members are missing.
This bridge has something interesting that I think I might be able to apply to joints 2 and 4.
















See how the bottom member actually fits into and becomes a part of the upper member? I think I might be able to use that same idea in this year's bridge in joints 2 and 4. I think it would add strength to the joint that I wouldn't get if I just glued members 3 and 4 to the outside of the member under the loading plate. (?)
















Another thing to notice about this bridge is how it used vertical members very similar to member 5. The joint connecting that member to the loading point snapped in this bridge, and I'm wondering what I might do to keep that from happening to this year's bridge.


















And finally, just a picture of my favorite bridge and the one that won third in the international bridge contest two years ago. This picture is actually a test bridge I built before I built the bridge I sent to the contest. Unfortunately, they didn't send my bridge back after the contest, so I'll never know where it actually broke. I can push on it pretty hard, and it won't even budge! Pretty cool.

Ok, that's all for now. I'll probably talk to Ben sometime tonight to hear what he thinks. (You know Ben, maybe Matt has some good advice for me! I'm sure he knows a lot about bridge design. After all, he's a Mines student!) (Matt, as in Ben's coworker) (Is that a cross between a cow and a penguin? Cows say moo, and penguins say ork, I think. Oh, maybe it's a cow that orks.)

Ok, ok, I guess I'm just going crazy, that's all. But I finished my big long report on Apollo 13! I now have one less thing to do this week. (Now all I have left is to design and build a bridge, and practice and do school. Blah.) It turned out about 1900 words long. I won't tell you how late I stayed up...

I love reading about Apollo 13; I don't know why. That's partly why the report took so long, and although I'm glad to be done with it, I'm kind of sad not to have a good excuse for reading about it on school time. I finished Jim Lovell's book on it, and I just put Gene Kranz's book on hold at the library. Ok, but that has to wait until after the bridge contest.

fred travers sat after a fast read garbage baggage drab bagger badger web best west zest zester qwest awe sad sadder saddest dart rat rate at a fast rate taste tester reader rebecca cards exert exerted farce red brag bragger bread breaded bead beaded axe trade trader grass grade graded rest rested fred travers rested at a tree after exerted as a taste tester at a drab garbage bag at a fast rate aftertaste Fred Travers ate Badger. Badger gave Fred a bad aftertaste.

Oh no, now I'm catching Mom's disease - trying to find all the words you can type with just your left hand.