Testing Apparatus

soccerkid812
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Re: Testing Apparatus

Post by soccerkid812 »

MrsKingCMS wrote:When looking at the rules, it mentions that a 8 cm diameter circular opening is required above 30.0 cm of Division B tower. How is a 5 cm x 5 cm block going to be supported by an 8 cm diameter hole?

Please clarify...
the testing block that sits on top of the tower is a 5x5 block

above 30cm for division C, the tower must fit INSIDE a 8cm diameter circle, its an imaginary circle
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Re: Testing Apparatus

Post by eta150 »

soccerkid812 wrote:
MrsKingCMS wrote:When looking at the rules, it mentions that a 8 cm diameter circular opening is required above 30.0 cm of Division B tower. How is a 5 cm x 5 cm block going to be supported by an 8 cm diameter hole?

Please clarify...
the testing block that sits on top of the tower is a 5x5 block

above 30cm for division C, the tower must fit INSIDE a 8cm diameter circle, its an imaginary circle
Are you sure it's not under 35? Or are you talking about div. B?
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soccerkid812
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Re: Testing Apparatus

Post by soccerkid812 »

eta150 wrote:
soccerkid812 wrote:
MrsKingCMS wrote:When looking at the rules, it mentions that a 8 cm diameter circular opening is required above 30.0 cm of Division B tower. How is a 5 cm x 5 cm block going to be supported by an 8 cm diameter hole?

Please clarify...
the testing block that sits on top of the tower is a 5x5 block

above 30cm for division C, the tower must fit INSIDE a 8cm diameter circle, its an imaginary circle
Are you sure it's not under 35? Or are you talking about div. B?
oh yea, ur right, my fault

division C: base of 15cm, 35cm chimney
division B: base of 30cm, 20cm chimney
50cm min for both towers
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Re: Testing Apparatus

Post by deezee »

above 30 cm of the tower, the supervisors will probably place a tube with a diameter of 8 cm over your tower. the loading block is 5x5, but you can make the tower up to 5.6x5.6 cm
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Re: Testing Apparatus

Post by soccerkid812 »

i build my towers in 2 parts, the base and the top
when testing it, would each part have to hold all 15kg, or would the weight be distributed, for example, 7.5 in the top, 7.5 at the bottom?
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Re: Testing Apparatus

Post by yousef213 »

Well, unless you have a very unusual design, the force will go theough the 4 legs of your chimney, each holding about 3.75 kg (assuming you hold all the weight) then all the weight will be Transferred to the base, then to the ground.

So if your chimney if weak it wont get to the base, and if the base is weak, it wont be transferred to the ground.

Either case will result in premature failure.

So, the answer is BOTH THE CHIMNEY ANDTHE BASE NEED TO SUPPORT 15 KG ON THEIR OWN

That is one possible reason of why the chimney may feel very solid alone, but when attached, the structure itself feels weaker.
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Re: Testing Apparatus

Post by TYG »

Anyone know which states use BBs for tower testing? Also, why are BBs used instead of sand in some regional/state competitions?
Shouldn't the material they use to load the tower be kept constant, especially if sand is being used at the National tournament? In the rules for towers, it states,
The Event Supervisor provides the assessment devices, testing apparatus, hardware, and clean, dry sand or similar dry, free-flowing material (referred to subsequently as "sand").
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Re: Testing Apparatus

Post by smartkid222 »

Image 2008 NY BLG Champ
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Re: Testing Apparatus

Post by rjm »

The wording in the rules was carefully chosen to permit use of various materials of loading structures, including BBs, sand, anything which is reasonably fine and flows smoothly without clumping or delivering noticeable impact loading to the structure. We call it all "sand" to make the rules read easily. The smooth, steady addition of load to the structure is more important than the particular material used.

At Nationals, we use Lake Michigan beach sand from a sand mine near Grand Haven, which has been cleaned, dried, sieved, and processed to remove carbonates and dust (it's processed to be foundry sand). We will not be using BBs. We think the sand flows smoothly and provides a steady-state load after the flow has begun, plus it's easy to clean up if someone kicks a bucket over.

Bob Monetza
Grand Haven, MI
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Re: Testing Apparatus

Post by TYG »

Okay, thank you for your explanation.

Also, is steadying the bucket allowed when testing the tower? Last year, two fingers (or something like that) were allowed, but I don't think it is stated anywhere in the rules.
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