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by baker
January 12th, 2017, 4:53 pm
Forum: Towers B/C
Topic: Towers B/C
Replies: 745
Views: 93839

Re: Towers B/C

I use 1/8*1/16 for some braces and 1/16*1/16 for some braces but I've changed to a new tower design with 1/16*1/16 that performed better than my 1/8*1/16. All the 1/8*1/16 will bassically go to waste and as I am low on 1/16*1/16 is it a bad idea to litterally strip off 1/16*1/16 from the 1/8*1/16 s...
by baker
January 10th, 2017, 12:39 pm
Forum: Towers B/C
Topic: Pictures, Videos, and Scores
Replies: 142
Views: 24463

Re: Pictures, Videos, and Scores

[quote="Balsa ManNo pics at this point, but a quick set of numbers to consider, and check your numbers against: From design calcs- for a tower weight of just over 8gr; legs fm 1.45 gr/36" at 3.26gr; ladders (using 1/4 bracing interval - 0.9gr/36" for lowest ladder, 0.8gr/36 for ones above it) at 1....
by baker
January 10th, 2017, 7:24 am
Forum: Towers B/C
Topic: Pictures, Videos, and Scores
Replies: 142
Views: 24463

Re: Pictures, Videos, and Scores

[quote="Balsa ManNo pics at this point, but a quick set of numbers to consider, and check your numbers against: From design calcs- for a tower weight of just over 8gr; legs fm 1.45 gr/36" at 3.26gr; ladders (using 1/4 bracing interval - 0.9gr/36" for lowest ladder, 0.8gr/36 for ones above it) at 1.7...
by baker
January 8th, 2017, 12:35 pm
Forum: Towers B/C
Topic: Towers B/C
Replies: 745
Views: 93839

Re: Towers B/C

I use 1/8*1/16 for some braces and 1/16*1/16 for some braces but I've changed to a new tower design with 1/16*1/16 that performed better than my 1/8*1/16. All the 1/8*1/16 will bassically go to waste and as I am low on 1/16*1/16 is it a bad idea to litterally strip off 1/16*1/16 from the 1/8*1/16 s...
by baker
December 24th, 2016, 2:43 pm
Forum: Towers B/C
Topic: Towers B/C
Replies: 745
Views: 93839

Re: Towers B/C

Balsa Man, thanks for your data. What glue are you using? We've been using Titebond II yellow wood glue. Students apply it with a tooth pick to both pieces to be joined and remove excess. It really soaks into the fiber of the wood and when there is a failure it rips the wood. But I wonder if it migh...
by baker
December 24th, 2016, 8:19 am
Forum: Towers B/C
Topic: Towers B/C
Replies: 745
Views: 93839

Re: Towers B/C

Balsa Man, Sorry for the mis-leading info on the leg weights. The 1.2 to 1.5 gm was the cut length of the legs, 60.5 cm long. The 36 inch weights varied from 1.7 to 2.3 grams. The heavier one was the one that was 1.52 gm cut to 60.5 cm. Cut lengths of legs were 1.20, 1.27, 1.23, 1.51 grams. Like I s...
by baker
December 23rd, 2016, 1:03 pm
Forum: Towers B/C
Topic: Towers B/C
Replies: 745
Views: 93839

Re: Towers B/C

Time for a Balsa Man reality check.... Built for bonus, 5 cm square at the top and 22 cm square at base Legs -1/8 x 1/8 inch, 12#/cf balsa, 1.27 to 1.51 grams / leg (yeah, one was stripped a little heavier) Ladders - 1/8 x 1/8 inch, 7#/cf balsa, 0.73 to 0.90 grams / side X bracing - 1/64 x 1/16 inc...
by baker
December 22nd, 2016, 1:01 pm
Forum: Towers B/C
Topic: Towers B/C
Replies: 745
Views: 93839

Re: Towers B/C

Balsa Man... I hope people appreciate the work you do! Your research shows hours of testing, stuff I always wanted to do but never had time to. Sometimes hard to follow but I love the conclusion. Because of years of hands on building with different sets of students I can see your data follows our e...
by baker
December 19th, 2016, 6:25 pm
Forum: Towers B/C
Topic: Towers B/C
Replies: 745
Views: 93839

Re: Towers B/C

Llamastwaimzjf wrote:Ohhhh true. What design would you recommend on braces? I mean if you have to many braces that is a lot of unnecessary weight, but if no braces at all then weaker tower.
See pages 10 and 17.
by baker
November 16th, 2016, 12:54 pm
Forum: Towers B/C
Topic: Towers B/C
Replies: 745
Views: 93839

Re: Towers B/C

X's and ladders are what we used in 2012 to counter what we found was a twisting action that would occur when loading. We wanted to try "V" bracing (figure 1) on our first tower to see if it works and if it saves any weight that X bracing might have.

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