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by JZhang1
December 7th, 2019, 6:19 pm
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 232
Views: 19574

Re: Boomilever B/C

Where do y'all buy basswood for tension members?
by JZhang1
November 30th, 2019, 10:06 am
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 232
Views: 19574

Re: Boomilever B/C

https://www.desmos.com/calculator/efiabgnr7l Here are some equations I made that model the efficiency vs number of bracings for trapezoidal prism shaped box boomilevers with X bracings and 1/8th square balsa columns. Green uses linear regression for the relationship of balsa critical load vs mass. B...
by JZhang1
November 24th, 2019, 3:19 pm
Forum: Boomilever B/C
Topic: Balsa Wood Database??
Replies: 0
Views: 394

Balsa Wood Database??

So basically I wanted to compile a database of the Critical Load - Mass relationship of all kinds of balsa sticks. It would probably be helpful to lots of people for reasons I don't know yet. Personally, I wanted to use the data to make a mathematical model for the ideal bracing/stiffness combinatio...
by JZhang1
November 20th, 2019, 11:08 am
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 232
Views: 19574

Re: Boomilever B/C

I suppose there are ways of getting really scientific and testing the tensile strength of bass, but the problem comes in actually attaching a quantifying device such as luggage scale. With 1/16" material this can very difficult without either mashing or bending the piece which adds shear forces to ...
by JZhang1
November 17th, 2019, 6:19 pm
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 232
Views: 19574

Re: Boomilever B/C

The 1/16 square basswood tension members I use can never seem to get full load. What density tension members have you guys seen get full load consistently? Also I remember reading something about using a luggage scale to test the tensile strength of tension members. Does anyone have any specifics on...
by JZhang1
June 4th, 2019, 2:48 pm
Forum: Boomilever B/C
Topic: PICTURES, SCORES, VIDEOS!!
Replies: 189
Views: 29177

Re: PICTURES, SCORES, VIDEOS!!

Medalling efficiency for div. C was 1942. To me it seemed like the testing device at nationals was on the slower and bendier side so it would make sense for the scores to be a bit lower. either way everyone shouldve been affected pretty much equally. It was definitely slower. Although, I like it a ...
by JZhang1
June 4th, 2019, 2:42 pm
Forum: Boomilever B/C
Topic: PICTURES, SCORES, VIDEOS!!
Replies: 189
Views: 29177

Re: PICTURES, SCORES, VIDEOS!!

Medalling efficiency for div. C was 1942. To me it seemed like the testing device at nationals was on the slower and bendier side so it would make sense for the scores to be a bit lower. either way everyone shouldve been affected pretty much equally. I agree that it was definitely slower - sand was...
by JZhang1
June 4th, 2019, 2:10 pm
Forum: Boomilever B/C
Topic: PICTURES, SCORES, VIDEOS!!
Replies: 189
Views: 29177

Re: PICTURES, SCORES, VIDEOS!!

Medalling efficiency for div. C was 1942. To me it seemed like the testing device at nationals was on the slower and bendier side so it would make sense for the scores to be a bit lower. either way everyone shouldve been affected pretty much equally.
by JZhang1
May 22nd, 2017, 7:43 am
Forum: 2017 Nationals
Topic: Raw Scores Collection (chalker)
Replies: 20
Views: 3831

Re: Raw Scores Collection (chalker)

Hey Chalker,
could you post the difference between..
4th and 1st in Meteorology,
2nd and 1st in Towers,
3rd and 1st for Roller Coaster,
14th and 6th in Road Scholar,
and between 23rd and 6th for Mission Possible?

Thanks
by JZhang1
May 20th, 2017, 9:22 pm
Forum: Towers B/C
Topic: National Tower Scores?
Replies: 40
Views: 6730

Re: National Tower Scores?

I know 5th place (Tower Heights) held 12.08kg and weighed 4.08 (2960). Not me by the way. I got 20th (Wydown) held 9.9kg (with bonus) and weighed 7.01 (1697) And I've heard a rumor Gelinas got around 3400 (disappointed cuz they were expecting 3900 More or less true, but very happy with the placing.

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