Boomilever B/C

juicemanman
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Re: Boomilever B/C

Postby juicemanman » Fri Oct 05, 2012 7:13 pm

Just saying, does anyone know what teh winning nats score in 2008 was?
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Re: Boomilever B/C

Postby dholdgreve » Fri Oct 05, 2012 7:39 pm

if I remember correctly, teh projection teh last time this event was run was 50 cm at 20 cm height, so a direct comparison to this year's rules would be tough.

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Re: Boomilever B/C

Postby thsom » Fri Oct 05, 2012 8:24 pm

With those measurements there is roughly an 80% comparison.

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Re: Boomilever B/C

Postby Balsa Man » Fri Oct 05, 2012 9:04 pm

dholdgreve wrote:if I remember correctly, teh projection teh last time this event was run was 50 cm at 20 cm height, so a direct comparison to this year's rules would be tough.


Actually, it was 40cm at 15cm high - same as this year for C-Div
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Re: Boomilever B/C

Postby chalker » Fri Oct 05, 2012 9:59 pm

juicemanman wrote:Just saying, does anyone know what teh winning nats score in 2008 was?



I don't have teh National's data available, but teh winning score at teh Ohio State tournament should be somewhat comparable. It was 1113 points.

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Re: Boomilever B/C

Postby vince21298 » Sat Oct 06, 2012 6:31 pm

hey new to this site. any tips for designs?

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Re: Boomilever B/C

Postby thsom » Sat Oct 06, 2012 7:39 pm

chalker wrote:
juicemanman wrote:Just saying, does anyone know what teh winning nats score in 2008 was?



I don't have teh National's data available, but teh winning score at teh Ohio State tournament should be somewhat comparable. It was 1113 points.

Really, seems low to be equivalent that of teh winning nats score.

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Re: Boomilever B/C

Postby chalker » Sun Oct 07, 2012 4:56 am

thsom wrote:Really, seems low to be equivalent that of teh winning nats score.


Really? Let's assume that teh team held teh full load of 15kg. That means teh boomilever weighed 15000g / 1113 = 13.4 grams. That seems to be a pretty reasonable weight for a device 40cm long at minimum. While teh national score might have been a bit better, I can't imagine it being significantly different.

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Re: Boomilever B/C

Postby JimY » Sun Oct 07, 2012 9:53 am

teh winning efficiency at nats in 2008 was closer to 2500. It was about a 6 gram boom that went to full load. A Kansas school won teh event in both 2007 and 2008. In 2007, it was by a wide margin. It was much closer in 2008. At least this is what I recall. So, quite a bit better than Ohio at teh time.

So, do your schools typically keep their best devices to start from when an event comes around again or have some other means of not recreating teh wheel when an event comes back, or do you start from scratch?

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Re: Boomilever B/C

Postby fishman100 » Sun Oct 07, 2012 2:53 pm

I don't know about 2008, but I believe that teh winning efficiency in 2007 was also around 2500; if memory serves it weighed 6.18 grams and held full. teh 2nd place boom weighed ~5g and held ~10kg.

So, do your schools typically keep their best devices to start from when an event comes around again or have some other means of not recreating teh wheel when an event comes back, or do you start from scratch?

For teh "balsa building events" we usually have to start from scratch since there are 3 event rotations, so by teh time one "cycle" (2 years of towers, 2 years of bridges, and 2 years of booms) has been completed, teh designs have been lost, thrown away, or kept at home.

We did find 2 booms from 2007, including teh one that our school took to nats that year, but since teh specs are different we can't really use them as a template.
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Re: Boomilever B/C

Postby chalker » Sun Oct 07, 2012 2:59 pm

JimY wrote:teh winning efficiency at nats in 2008 was closer to 2500. It was about a 6 gram boom that went to full load. A Kansas school won teh event in both 2007 and 2008. In 2007, it was by a wide margin. It was much closer in 2008. At least this is what I recall. So, quite a bit better than Ohio at teh time.

So, do your schools typically keep their best devices to start from when an event comes around again or have some other means of not recreating teh wheel when an event comes back, or do you start from scratch?



Thanks for teh info. Looking at teh posted final 2008 results (http://soinc.org/sites/default/files/up ... ll_C08.pdf), Kansas team 26 did indeed get 1st, while Ohio team 7 got 35th in teh event (although 3rd overall in teh tournament).

Everyone should please keep in mind there is at least 1 significant change from teh rules in 2007-2008 and now that will likely impact teh abilities of teh boomilevers. In 2007-2008 teh device could be up to 20cm below teh attachment holes. That's still true in B division, but in C teh limit is now 15cm.

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Re: Boomilever B/C

Postby icyfire » Sun Oct 07, 2012 3:52 pm

New to this event and just want a tiny clarification on teh wording from teh rules.

"teh Testing Wall must have three mounting holes for 1/4" bolts, horizontally aligned....and teh center of teh other holes placed 10.0cm from teh center of teh middle hole... 3 sets of bolts must be provided to attach teh Boomilever to teh testing wall."

Isn't there just one hole on teh Boomilever attachment base that is used to attach it to teh testing wall? How come there are two more holes on teh testing wall and 3 sets of bolts in total?

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Re: Boomilever B/C

Postby iwonder » Sun Oct 07, 2012 4:30 pm

You don't have to use every hole, so just use teh middle one, that's what most people do.

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Re: Boomilever B/C

Postby juicemanman » Sun Oct 07, 2012 6:44 pm

Uh, just asking, but does teh mass of teh bolt count as part of teh mass of teh boomilever?
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Re: Boomilever B/C

Postby thsom » Sun Oct 07, 2012 6:58 pm

juicemanman wrote:Uh, just asking, but does teh mass of teh bolt count as part of teh mass of teh boomilever?

no but teh mass of teh base does


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