Search found 195 matches

by SLM
April 30th, 2013, 8:02 pm
Forum: 2013 Invitationals, Regionals, and States
Topic: Virginia 2013
Replies: 36
Views: 7763

Re: Virginia 2013

Oh hi, I probably know you then! :) ... But yeah, Longfellow really is amazing at what they do, I believe they've won 8th at Nationals recently? Hopefully we can increase Virginia's score in Division C this year! :D I don't believe we have met, I have not been to any of the tournaments this year. B...
by SLM
April 29th, 2013, 10:32 am
Forum: 2013 Invitationals, Regionals, and States
Topic: Virginia 2013
Replies: 36
Views: 7763

Re: Virginia 2013

I heard Longfellow has Science Olympiad as an elective lol... My friend could be wrong but that's what he told me. This was not the case couple of years ago when I was a Longfellow parent. I would be pleasantly surprised if the school has constituted an elective course with a focus on STEM in gener...
by SLM
April 29th, 2013, 6:24 am
Forum: 2013 Invitationals, Regionals, and States
Topic: Virginia 2013
Replies: 36
Views: 7763

Re: Virginia 2013

Also, really interesting to see TJ make it for div. C. It'll be fascinating to see how they do at Nationals - lots of talent there, clearly. The school has the same sort of design as Troy or LASA or NC, and it sounds to me like the team is set up relatively similarly to what Troy does (obviously th...
by SLM
September 13th, 2012, 6:07 pm
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 622
Views: 67589

Re: Boomilever B/C

I believe that bending only occurs if there is "give" in the boomilever, most likely the tension strips. When the tension members begin to bend, the main compression shape of your boom should begin to bend as well. I would not characterize bending like this. I would say, the boom has three joints (...
by SLM
August 26th, 2012, 10:27 am
Forum: Towers B/C
Topic: Boomilever for 2013
Replies: 142
Views: 30643

Re: Boomilever for 2013

Also, how can I calculate the moment of inertia of the entire compression structure? (This is in a 'box-beam' style boom.) My best guess is to use the general formula I=\frac{bh^3}{12} , but I would think it's more complex than that. If by box-beam, you mean a hollow rectangular section, then its M...
by SLM
August 25th, 2012, 5:39 am
Forum: Towers B/C
Topic: Boomilever for 2013
Replies: 142
Views: 30643

Re: Boomilever for 2013

A vertical piece in the middle of the compression member connected to the middle of the tension member would help brace the compression member from buckling, but the force is not very big so may not affect the tension member that much? Did I interpret the posts you posted correctly? Also, how would...
by SLM
August 24th, 2012, 10:18 pm
Forum: Towers B/C
Topic: Boomilever for 2013
Replies: 142
Views: 30643

Re: Boomilever for 2013

...maybe it is possible that people have tested and concluded those vertical supports may be able to reduce more weight from the compression part of the boom than they would add to the boom( their own mass + using slightly stronger tension members.) Can anyone confirm this? but this would most like...
by SLM
August 24th, 2012, 10:07 pm
Forum: Towers B/C
Topic: Boomilever for 2013
Replies: 142
Views: 30643

Re: Boomilever for 2013

...but I always thought that putting a force on the tension member like that would take the member out of pure tension and allow it to fail much sooner than other members... is that true? True. But, you may not have any choice if you need to control buckling in the compression member using bracings...
by SLM
August 24th, 2012, 9:59 pm
Forum: Towers B/C
Topic: Boomilever for 2013
Replies: 142
Views: 30643

Re: Boomilever for 2013

For the simple triangular design, the vertical member that connects the tension member to the compression member carries very little axial force. Well, theoretically speaking the applied load causes no axial force in that member, if the compression member is horizontal. The (vertical) member mainly ...
by SLM
July 23rd, 2012, 7:35 am
Forum: Towers B/C
Topic: Boomilever for 2013
Replies: 142
Views: 30643

Re: Boomilever for 2013

Wow, the discussion is getting interesting. I have a question, though. Will longer tubes hold less than shorter tubes of the same thickness and diameter? For example, iwonder said his tube was "3.75" long, weighed 1.2g and held 50kg before failure." So will a 16 inch tube (~40 cm) hold less than 50...

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