Ongoing Contest(Scores)

iwonder
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Ongoing Contest(Scores)

Postby iwonder » September 1st, 2012, 2:55 pm

Just to not clutter up the other topic, lets post the mass and mass held of booms that get tested over here, kinda like a little contest that we could keep going on through the season, maybe everyone can get an idea of what to expect score wise since this event hasn't been done in a while. Plus it'll be fun :D (I know we have a score tracker, but I've never seen it used much...)

I'll be testing some this weekend(hopefully) and will post up what I get later. Good luck!
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Re: Ongoing Contest(Scores)

Postby thsom » September 2nd, 2012, 6:39 am

Do you by chance know the rules for the boomilever this year? I'm just wondering about the basics like the dimensions, prohibited materials, etc. If I were to wait for the rules from my coach I'd get them in like 1 and a half months...

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Re: Ongoing Contest(Scores)

Postby iwonder » September 2nd, 2012, 7:36 am

Not yet, right now I'm building to a 40cm x 15cm boom dimension and the standard loading block/weight procedure, I'm also using a 1/4-20 hex head bolt without a washer. 1.5 months to get the rules! I'd die...

I suppose I should post the horrid result here... There's an account of the failure in the other topic, anyways, it weight 11.14g and held 4.17kg. :o

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Re: Ongoing Contest(Scores)

Postby juicemanman » October 1st, 2012, 2:53 pm

I did get the rules. Would you like for me to post them?
You can't read this. You mad bro?

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Re: Ongoing Contest(Scores)

Postby iwonder » October 1st, 2012, 3:04 pm

No... they're copyrighted, plus most of us have already received rules :)
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Re: Ongoing Contest(Scores)

Postby benklee127 » October 22nd, 2012, 4:22 pm

I tested 4 so far and they improved dramatically each time :D
Testing is good!
Boomi #1:
Mass: 9.40
Held: 1405
eff:149

Boomi #2
Mass: 5.51
Held: 1410
eff: 256

Boomi #3
Mass: 8.82
held: 4092
eff: 464

Boomi #4 ( i accitidentally hit this during the loading process so i didn't get to see what the max was :/)
Mass: 9.81
Held: 7014
eff: 715

I cant find much to compare my scores to online :P
Test lots guy and post your results!
Thanks

~Benjamin Lee

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Re: Ongoing Contest(Scores)

Postby juicemanman » October 22nd, 2012, 4:31 pm

Well, I built a 7.8g boomlever, but I haven't tested it yet. Looks pretty stable, but the test tells all.
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Re: Ongoing Contest(Scores)

Postby benklee127 » October 22nd, 2012, 5:38 pm

test test test test test test test test test test
reply
:D
Edit: oh wait your div. B and your rules are diffrent :P ah well
~Benjamin Lee

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Re: Ongoing Contest(Scores)

Postby benklee127 » October 22nd, 2012, 6:15 pm

Did some research
apparently my scores suck :D

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Re: Ongoing Contest(Scores)

Postby fishman100 » October 22nd, 2012, 6:28 pm

To make you all feel better about your scores, here's my first boom of the year:

Mass: 5.97 g
Mass held: 120 g

Efficiency: 26.80 :P
(Broke when I put the bucket on, so I recorded the mass of the loading block)


Second boom:

Mass: 6.62 g
Mass held: 1.77 kg

Efficiency: 267.37

Still need a lot of improvement, but it's early in the season, so...
Langley HS Science Olympiad '15

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Re: Ongoing Contest(Scores)

Postby benklee127 » October 22nd, 2012, 9:32 pm

Does anyone know the specs from 2008?
apparently the best efficiency was around 2500 o.o
I just cant imagine that happening
its too awesome xD

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Re: Ongoing Contest(Scores)

Postby juicemanman » October 24th, 2012, 2:45 pm

Hey, just a suggestion: Build a heavy boomilever that can hold 15kg, then whittle down the parts you don't need instead of building a light boomilever that can't hold anything and then making it better. Makes you feel better about yourself :D
You can't read this. You mad bro?

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Re: Ongoing Contest(Scores)

Postby juicemanman » October 24th, 2012, 3:41 pm

test test test test test test test test test test
reply
:D
Edit: oh wait your div. B and your rules are diffrent :P ah well
~Benjamin Lee
Erm, what's different? The 15 v. 20 cm height? I built mine with 12 cm, anyways.
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Re: Ongoing Contest(Scores)

Postby Balsa Man » October 24th, 2012, 7:32 pm

Does anyone know the specs from 2008?
apparently the best efficiency was around 2500 o.o
I just cant imagine that happening
its too awesome xD
Specs for 2008 are discussed in the boom thread- for C-Div they are the the same as this year. The B-Div specs are different only by the height (20cm- 5 cm higher than C-Div).
test test test test test test test test test test
reply
:D
Edit: oh wait your div. B and your rules are diffrent :P ah well
~Benjamin Lee
Erm, what's different? The 15 v. 20 cm height? I built mine with 12 cm, anyways.
There is a reason B-Div height is more than C-Div; the smaller the height, the smaller the angle at the tip end; the smaller the angle, the greater the forces on the tension and compression members. Posted the basic forces numbers earlier; in B-Div, forces are about 3/4 what you have in C. At the full 15 kg load, 44kg tension & 40kg compression in a C, vs 34T & 30C in a B. By building to a 12cm height, you are badly shooting yourself in the foot; without running the numbers, at a 15kg load, tension will be well over 50kg; pushing 55, w/ compression well over 45kg, probably approaching 50. So, if your "build" (tensile strength of the tension member(s) & compression/column strength of the boom arm) could carry the forces generated by a 15kg load (if it were configured with a 20cm height), with a 12cm height, it would only be able to carry...8 or 9kg. Oops, not good.....
Before settling in on a design, you really need to understand the basic science at work- the physics/forces that are going on. You want every little bit of height you can get. The forces generated in a boom are a LOT higher than in towers from last year......
Len Joeris
Fort Collins, CO

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Re: Ongoing Contest(Scores)

Postby juicemanman » October 27th, 2012, 8:53 am

I guess... if after I test it and it doesn't do well, I could make it higher. But wouldn't it add a lot more mass?
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