Search found 47 matches

by JZhang1
February 4th, 2020, 12:53 pm
Forum: 2020 Invitationals
Topic: Science Olympiad at MIT Invitational 2020
Replies: 132
Views: 30049

Re: Science Olympiad at MIT Invitational 2020

Anybody know how I can contact the ES for Machines? Or have the raw scores.
by JZhang1
February 2nd, 2020, 9:39 am
Forum: Boomilever B/C
Topic: Wood Sources
Replies: 3
Views: 827

Re: Wood Sources

Yes. I get basswood from Balsa USA tho.
by JZhang1
December 7th, 2019, 6:19 pm
Forum: Boomilever B/C
Topic: Boomilever B/C
Replies: 357
Views: 46626

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: 357
Views: 46626

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: 846

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: 357
Views: 46626

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: 357
Views: 46626

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: 37544

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: 37544

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: 37544

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.

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