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by T-B
September 21st, 2014, 8:00 pm
Forum: Bridge Building B/C
Topic: "no portion may extend below the top surface"
Replies: 13
Views: 3900

Re: "no portion may extend below the top surface"

Has anyone submitted an official clarification request on this issue? Based on our reading, we think 4(e) -- No portion of the bridge may extend below the top surface of the test supports prior to testing -- means that you must build a through bridge rather than an upside-down deck bridge. Is that w...
by T-B
February 18th, 2013, 8:25 pm
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 622
Views: 66940

Re: Boomilever B/C

17 g. but it had a crazy-big box with way too much unnecessary wood, plus the tension pieces were way too big too. So it wasn't very useful. I guess I'm trying to understand why a square cross-section would be better in tension... That just doesn't make sense to me.
by T-B
February 18th, 2013, 8:18 pm
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 622
Views: 66940

Re: Boomilever B/C

I did and it worked fine, but it was an earlier version that was overbuilt. So is there a reason or is it just because that is what Aia used? Seriously.
by T-B
February 18th, 2013, 8:04 pm
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 622
Views: 66940

Tension Cross-Section

It seems like most people are using a 3/32" square stick of basswood for the tension members. Is that simply because that size is easily accessible? It seems that a rectangular shape (say 1/16 x 1/8 or 1/16 x 5/32) would perform as well and have the added advantage of greater gluing surface area. Is...
by T-B
July 22nd, 2012, 12:59 pm
Forum: Towers B/C
Topic: Boomilever for 2013
Replies: 142
Views: 30391

Re: Boomilever for 2013

So that means the primary value of using a tube is eliminated if you end up needing to use two tubes which would function similarly to two square or rectangular beams? I still need to think through the dilemma about how you would attach the tension chords to the tubes. Not much gluing surface. You w...
by T-B
July 22nd, 2012, 8:41 am
Forum: Towers B/C
Topic: Boomilever for 2013
Replies: 142
Views: 30391

Re: Boomilever for 2013

If we want to try making balsa tubes for the compression member, how thin should we go to get it to roll? I presume 1/64th and it rolls into a long pencil-shape with the grain going the long way, right? Isn't there a huge risk of failure related to using balsa in that thin? Even 1/32nd is quite thin...
by T-B
May 13th, 2012, 5:55 am
Forum: General Competition
Topic: Angry Coach- pls read
Replies: 15
Views: 2400

Re: Angry Coach- pls read

Wait, am I reading your post correctly? Is the Division B coach the one saying you won't make the Division C team? Or is it the Division C coach that says you can't try out? This is important. You are a great asset to you Division B coach, so she probably wants to keep you. But she only has the righ...
by T-B
April 30th, 2012, 10:07 am
Forum: Towers B/C
Topic: Designs
Replies: 306
Views: 43086

Re: Designs

Thanks, SLM and Balsa Man. Reading this forum is exactly how we've gotten as far as we have -- 2nd at state in '12, 13th with catastrophic failure in '11, 2nd in '10, and 3rd '09). We read this forum almost every day, but we really want to take it to the limit this next year. We will build over the ...
by T-B
April 29th, 2012, 5:10 am
Forum: Towers B/C
Topic: Designs
Replies: 306
Views: 43086

Re: Designs

Our team doesn't have the benefit of coaches who are knowledgeable about engineering, so we try to learn what we can on our own. We've done pretty well so far, but to take it to the next level, we need to understand more. SLM, Balsa Man, and others,do you have a textbook (college or whatever) that y...
by T-B
April 26th, 2012, 9:29 am
Forum: Towers B/C
Topic: Designs
Replies: 306
Views: 43086

Re: Designs

Thank you so much for giving that calculation. Thinking that we will really need to understand this for boom

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