Balsa Wood Bridge: 202 Pounds

  Рет қаралды 197,863

dm__

dm__

Күн бұрын

This is a bridge that Michael and I built and tested in our high school engineering class. Overall it had a mass of 85 grams (0.19 lbs) and held 202 lbs. We used wood glue to connect the pieces of balsa wood.
Restrictions:
- No more than two pieces of balsa wood could be laminated together with wood glue
Thanks to Chris for filming!
Tested on 12.13.2010

Пікірлер: 66
@jjsrt8
@jjsrt8 11 жыл бұрын
After unloading the platform and reloading it you had already stressed the wood. So it probably could have held more
@fischer1672
@fischer1672 6 жыл бұрын
My popsicle stick bridge in middle school weighed 146 grams (0.32 lbs) and used 98 popsicle sticks. It was held by just normal Elmer's School Glue. It held 200 pounds for 5 minutes and didn't break. It was tested 3 times and got over 200 lbs each time, but we didn't have any more weights so we had to call it at 200. (We stacked 50 textbooks which each weighed exactly 4 lbs so that was 200 lbs.) It had a span length of 457.2 millimeters (18 inches) and had 76.2 millimeters (3 inches) of the bridge resting on the test tables on each side.
@hopeandsad872
@hopeandsad872 Жыл бұрын
Please share me your project.
@michaelrouse7959
@michaelrouse7959 9 жыл бұрын
I few weeks ago in my PLTW high school engineering class I made a truss out of balsam wood that weighed .0088 grams and held 350 lbs.
@kika7995
@kika7995 11 жыл бұрын
We made a balsa wood bridge in school. Ours weighed 16 grams and held 960 pounds. This bridge looks alot cooler than ours did.
@jasonoverstreet6270
@jasonoverstreet6270 7 жыл бұрын
You can't just put weights anywhere like they did. That's not an accurate test. Bridges aren't designed or intended to have mass load on top of the truss like that. The criteria should have been laid out from the beginning so the design could take into account where loads would be placed.
@vladislavsbudovskis4846
@vladislavsbudovskis4846 5 жыл бұрын
The issue of this bridge is that the load is in upper side of the bridge which means it can take more than usual bridge construction. So if you normally put loads where they use to be, on drive way, I think you will have max one third of your result.
@brianhymer3427
@brianhymer3427 8 жыл бұрын
Bridge efficiency is 1,078... That's Pretty good, but I hear some balsa bridges in Science Olympiad last year got scores of 1,500 to 3,400 (!). My bet is you could have held a lot more weight if you were using sand (thus gradually adding weight) instead of heavy Dumbbells. Still, that was wayyyyy cool, thanks for sharing!
@grimmtrotzits
@grimmtrotzits 11 жыл бұрын
I did this in middle school! Ohhh I want to make balsa wood bridge again!!
@mlist09
@mlist09 13 жыл бұрын
5:39 was the best part :D
@Good13055Productions
@Good13055Productions 11 жыл бұрын
My bridge held 55 punds balsa wood 3/32x3/32 squar root wood with 10 inches long 6 inches heigh and 3 inches with and it weight 4.2 grams
@carmelpule6954
@carmelpule6954 6 жыл бұрын
The success of this loading was due to the fact that the suspension point was right on top of the bridge where the joints were in compression and the only tensioned joints were the horizontal lowest part. If the suspension point was on the lower horizontal part so that it was pulling rather than pushing on the bridge, this bridge would have failed before. Students should consider carefully whether to load the bridge by pushing on it at the highest points or pulling on it from the lowest point as it does make a difference.
@badw01f23
@badw01f23 8 жыл бұрын
that is amazing. just wow
@stephenimsong3462
@stephenimsong3462 9 жыл бұрын
Not bad, I expected a truss that big would take a larger load honestly.
@Infipark
@Infipark 8 жыл бұрын
amazing architecture.
@rishapkumar5039
@rishapkumar5039 7 жыл бұрын
the bridge i made held up till 467 lb total weight of bridge was 170 grams efficiency 2457.9
@JacobEllinger
@JacobEllinger 7 жыл бұрын
if the wight is not on the expansion then it's not a very good bridge test.
@outdoormike0505
@outdoormike0505 11 жыл бұрын
the teacher took photos and video. I'll probably upload it when I get it. The bridge had much different dimensions though. it was 10.5"x4"x3.5"
@markbroadwaywms1927
@markbroadwaywms1927 2 жыл бұрын
What was the overall length of the bridge?
@pranavhegde98
@pranavhegde98 9 жыл бұрын
That is frickin awesome
@fordaiffa6022
@fordaiffa6022 Жыл бұрын
Very nice What was the balsa wood specifications n size Surely the fiber stress was below critical Great project though !
@fudge817
@fudge817 11 жыл бұрын
Did the bridge have the requirement that no two touching pieces could be parallel?
@STAxTartaglia
@STAxTartaglia 10 ай бұрын
Any details on the dimension?
@skyecleckler6380
@skyecleckler6380 9 жыл бұрын
I have to make a finished balsa wood bridge by January 24 for science Olympiad with an eighth grader
@katepurrkins6672
@katepurrkins6672 11 жыл бұрын
This is so amazing! :o
@outdoormike0505
@outdoormike0505 11 жыл бұрын
I just made a similar one that i tested today! I have the school record at 435 lbs
@MyNameIsBob212
@MyNameIsBob212 11 жыл бұрын
1 kg = ~2.2 pounds. So 202/2.2= 91.8, about 91.8 kg, Meaning it was able to support about 1080 times its own weight.
@maitreyeerele
@maitreyeerele 10 жыл бұрын
That was amazing! xD
@andrewroesch26
@andrewroesch26 10 жыл бұрын
I built one that weighed point 88 oz. And held 450lbs
@nurshuhadarazali
@nurshuhadarazali 11 жыл бұрын
how long do u take to make this bridge?
@wenzhig4242
@wenzhig4242 7 жыл бұрын
光考虑承载力和自重没有意义,还需要考虑宽度限制,高度限制,动载还是静载。我的1.2m长,10cm宽,10cm高,能承受至少40kg静载,5kg的边载(同时支座有175Hz的1cm振幅震动)荷载不会掉下去。自重186g It is no sence only consider the resistence and selfweight, width limit, height limit, dynamic load or static load also make influnce . mine is 1.2m long, 10cm wide, 10cm high, can hold at least 40kg static load, 5kg dynamic load (while the bearing has a 1cm amplitude vibration175Hz)and load will not fall off . weight 186g
@fspwork
@fspwork 12 жыл бұрын
what size of that balsa wood?
@MargaritaInclanRobredoXD_IXXI
@MargaritaInclanRobredoXD_IXXI 10 жыл бұрын
Awesome
@dicey78
@dicey78 10 жыл бұрын
"what was that" lol
@BAMBAMJROCK123
@BAMBAMJROCK123 12 жыл бұрын
wats the name of the song at the end
@travisclampittpanell2235
@travisclampittpanell2235 2 жыл бұрын
Im not the only one who realizes they were at 95lbs going 5 additional lbs at a time, why they didnt just go for 3 25lbs weights and then add another.. wouldve followed or at least picked up the progression better...
@mohdshukur8701
@mohdshukur8701 10 жыл бұрын
when the load impose at the top the member of compression and tension difference figure already that not exact correct way to impose the load to this test.
@lordpickle1935
@lordpickle1935 7 жыл бұрын
Ok so can you make an open file in the program ModelSmart3D pls like in 2 to10 Days
@Rose-the-protogen
@Rose-the-protogen Жыл бұрын
this is very hard to lift
@JakeyMeisty
@JakeyMeisty 8 жыл бұрын
What was the overall efficiency score?
@alissazhao9808
@alissazhao9808 8 жыл бұрын
+dm__ this bridge was only .19 grams heavy? thats would be insane
@drpwn100
@drpwn100 11 жыл бұрын
There is no way that only weighed 85 g
@phoebeats
@phoebeats 9 жыл бұрын
cool to bad I don't have enough time in my class to do that
@papasmurf7668
@papasmurf7668 11 жыл бұрын
U just wanna see it break!
@Charix460
@Charix460 2 жыл бұрын
nuts'
@cristopherraljevic4754
@cristopherraljevic4754 5 жыл бұрын
you spelled my name wrong its Cris not Chris
@donnisonable
@donnisonable 11 жыл бұрын
Hackers...
@keira.8400
@keira.8400 2 жыл бұрын
What type of bridge design did you use? I’m making a bridge for my science class and want to hold a lot of wait:)
@fluffy_noelle
@fluffy_noelle 7 жыл бұрын
1 dab 0n th3 h8rz. H0w ab0ut y0u?
@fluffy_noelle
@fluffy_noelle 7 жыл бұрын
lol sorry my pet lama walked on the keyboard XD
@RomeoB1999
@RomeoB1999 9 жыл бұрын
daniel . is it possible you could give me the blueprints to how you did this? or where you got it from ? this could be our best bet of winning our competion for school
@RomeoB1999
@RomeoB1999 9 жыл бұрын
well thank you anyways it helps
@ckozan
@ckozan 3 жыл бұрын
Kinda defeats the whole purpose of a "bridge" when there is a giant column in the center (eye bolt) .. Can't use the bridge if the road is blocked!
@potatohamlin5242
@potatohamlin5242 4 жыл бұрын
It holds 5 pounds I’m happy... 5 seconds latter ITS HOLDING MORE THAN 9000 POUNDS
@qurilishmexanikasi3013
@qurilishmexanikasi3013 2 жыл бұрын
Prosta klasss
@Space_Cat969
@Space_Cat969 7 жыл бұрын
I live being a virgin
@Thrallsm8
@Thrallsm8 11 жыл бұрын
i put thick cement and it held a ton :P
@wingedfury1000
@wingedfury1000 11 жыл бұрын
it held 202 pounds.
@Mike-cp7zf
@Mike-cp7zf 9 жыл бұрын
that was amazing! how did you guys build that?
@JakeyMeisty
@JakeyMeisty 8 жыл бұрын
Its just 1x1 inch strips of balsa would glued with wood glue
@Good13055Productions
@Good13055Productions 11 жыл бұрын
and im 13
@tylerdurden629
@tylerdurden629 3 жыл бұрын
Now you are 20
@freddy7694
@freddy7694 2 жыл бұрын
@@tylerdurden629 you mean 21
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