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by dholdgreve
January 17th, 2020, 5:22 am
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 224
Views: 18470

Re: Boomilever B/C

We are doing Boomilever for the first time and not sure of couple of rules. 1. Do we need to prepare/submit log book for competition? 2. How do we submit the Estimated Loading Supported to the officials at the event? Is it verbal or do we need to write it down as in log? No log is actually "require...
by dholdgreve
January 14th, 2020, 11:56 am
Forum: Regionals & States
Topic: Indiana 2020
Replies: 219
Views: 18490

Re: Indiana 2020

Yeah, we aren't going to that. I asked our coach if she accidentally signed us up, but she didn't so someone must have done it as a joke or something. Our other coach accidentally signed us up :lol: We are still not going though Hope you aren't being counted on to do anything <awkward> We are plann...
by dholdgreve
January 14th, 2020, 7:00 am
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 224
Views: 18470

Re: Boomilever B/C

Not sure if I already asked this question (please excuse my bad memory if so), but does SPFD decrease the strength of the member tested? Also, from skimming over the previous few posts, is the verdict that buckling strength and tensile strength have no relationship whatsoever? Think about it this w...
by dholdgreve
January 13th, 2020, 10:50 am
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 224
Views: 18470

Re: Boomilever B/C

As everyone is familiar with the "one finger buckling test", by Balsa Man himself, in order to categorize compression members, the general trend (or at least in my case) is that buckling strength is directly proportional to weight: a heavier stick would more or less have a greater buckling strength...
by dholdgreve
December 30th, 2019, 11:13 am
Forum: Lab Events
Topic: Food Science B
Replies: 55
Views: 7288

Re: Food Science B

I apologize if this question has already been answered-- In terms of the salinometer build for Food Science, is it permitted to build an Arduino or Raspberry Pi electric salinometer? It is rather unclear in the rules if this is allowed. Thanks for your time! Of course this is not the forum for Offi...
by dholdgreve
December 30th, 2019, 11:01 am
Forum: Lab Events
Topic: Crime Busters B
Replies: 19
Views: 2669

Re: Crime Busters B

Hi all, I'm a coach purchasing chemicals for my students and we've run across an issue. According to the resources on the Sci Oly site, Calcium Carbonate reacts with HCl, and Calcium Sulfate (Gypsum) does not. I purchased Calcium Carbonate and Calcium Sulfate both from Ward Science. My students wer...
by dholdgreve
December 16th, 2019, 12:21 pm
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 224
Views: 18470

Re: Boomilever B/C

I'm sure this has been answered at some point previously in time, but is there a place where I can buy the testing apparatus seen at most competitions? If no, are there plans or guides for how to build one? The SOINC page and event supervisor guidelines outline the testing apparatus and a general g...
by dholdgreve
December 13th, 2019, 5:14 am
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 224
Views: 18470

Re: Boomilever B/C

wait last year at nats did most people use the standard boomi design or did they use a tower chimney Again, different strokes for different folks, but I'm a firm believer that the more joints a boom has, the more opportunity there is for failure. Wood, especially balsa wood is anything but homogene...
by dholdgreve
December 12th, 2019, 6:43 am
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 224
Views: 18470

Re: Boomilever B/C

Not sure about booms, but I bake my turkey at 350 degrees for 20 minutes per pound!... Seriously, I'd worry more about the damage to the glue more than the brittleness of the wood. In northern colder climates, there is not much ambient moisture in the wintertime. As spring rolls around there may be ...

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