Efficiencies

Re: Efficiencies

Postby lllazar on Fri Nov 26, 2010 10:37 pm

Im pretty sure he/she means the base of the tower.
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Re: Efficiencies

Postby sciolyswizzle16 on Sun Nov 28, 2010 7:54 pm

i meant the efficiency of the tower as a whole
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Re: Efficiencies

Postby Littleboy on Sun Nov 28, 2010 8:02 pm

sciolyswizzle16 wrote:What are some of the best efficiencies you guys are getting?
And if our base keeps breaking, what would be a good way to fix it?


They were talking about your second question.
As to your first, 40 should be very competitive.
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Re: Efficiencies

Postby iYOA on Sun Nov 28, 2010 8:26 pm

sciolyswizzle16 wrote:And if our base keeps breaking, what would be a good way to fix it?


we have the exact same problem. in general we are trying to make our top lighter because if the base breaks first, it means we have unneeded weight at the top(so ideally, a tower should have the base and the top simultaneously break?)

to make the base stronger, you might want to add one more truss on each face of the base, or make the main sticks on the base less slanted. You can do this by making the 4 main sticks on the top slightly slanted, and changing up your dimensions. That way, the top will have slanted sticks and the base will have slanted stick but the sticks on the base will be less slanted.
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Re: Efficiencies

Postby SO4L on Sun Dec 05, 2010 11:47 pm

I just tested my first 2 towers of the season at an invitational and they both held 15kg. The efficiencies were 14.5 million and 15.2 million. I think i have my design down, now I just need to experiment with different types and dimensions of wood.
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Re: Efficiencies

Postby lllazar on Mon Dec 06, 2010 2:01 am

SO4L wrote:I just tested my first 2 towers of the season at an invitational and they both held 15kg. The efficiencies were 14.5 million and 15.2 million. I think i have my design down, now I just need to experiment with different types and dimensions of wood.


Competition for state :) But just out of curiosity, what dimensions of wood did you use for the base legs? I use 1/8 squared.
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Helicopter (Regionals -3rd gahhh) (State ~5th)
Wind Power (Regionals ~1st) (State ~3rd TIERED!)

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Re: Efficiencies

Postby SO4L on Thu Dec 09, 2010 9:59 pm

But just out of curiosity, what dimensions of wood did you use for the base legs? I use 1/8 squared.


I use 1/8 as well
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Re: Efficiencies

Postby Arthur on Sat Dec 11, 2010 2:29 pm

what efficiency do you think would be needed to medal at states in pa?
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Re: Efficiencies

Postby eta150 on Sun Dec 12, 2010 6:26 pm

Arthur wrote:what efficiency do you think would be needed to medal at states in pa?

Both divisions should have medaling begin at ~20 g/kg^2. The rules are tougher for C, but there are also usually better builders.
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Re: Efficiencies

Postby lllazar on Mon Dec 13, 2010 12:02 am

Yes that sounds about right. With practice and good jig designs (and that is crucial) as well as good wood, whether it be balsa or bass, state medals should start around there. By that u mean top 4 i suppose?
2011 Season Events~

Fossils (Regionals ~1st) (State ~6th)
Towers (Regionals ~1st) (State ~3rd)
Helicopter (Regionals -3rd gahhh) (State ~5th)
Wind Power (Regionals ~1st) (State ~3rd TIERED!)

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Re: Efficiencies

Postby AlphaTauri on Mon Dec 13, 2010 4:38 pm

PA gives out medals to Top 5 (and I assume most other states do the same thing).
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Re: Efficiencies

Postby Littleboy on Mon Dec 13, 2010 4:56 pm

Top six in Michigan state gets medals.
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Re: Efficiencies

Postby fizwiz on Tue Dec 14, 2010 5:08 pm

Top 6 in NY also.
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Re: Efficiencies

Postby phillies413 on Tue Dec 14, 2010 8:06 pm

top 10 in delaware!

The irony, I know.
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Re: Efficiencies

Postby bmbw123 on Tue Dec 14, 2010 8:31 pm

I'm sure this is a relatively stupid/simple question, but is there a certain way you all pour in the sand. If a lever system is used to let the sand fall in, would you want to go slow, then faster, then switch back to slow? Letting the sand in slow seems like it would make your tower sustain the weight for longer times, but faster streams seems a bit all of a sudden.

And if there is a manual sand system, then I would assume you would try to pour the sand around the bucket evenly, so there are no mounds, and try to do it as quick as possible?
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