Towers B/C

dholdgreve
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Re: Towers B/C

Postby dholdgreve » September 8th, 2016, 5:29 am

What is minimum height this year?
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Re: Towers B/C

Postby bearasmith » September 8th, 2016, 11:57 am

50cm for div. B and 60cm for div. C
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retired1
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Re: Towers B/C

Postby retired1 » September 8th, 2016, 6:33 pm

I do not have my copy of the rules yet, but those sound like the height for maximum points, not minimums.

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Re: Towers B/C

Postby bernard » September 8th, 2016, 11:20 pm

I do not have my copy of the rules yet, but those sound like the height for maximum points, not minimums.
They are minimums, outlined in rule 3.c., and there is no maximum height.
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Re: Towers B/C

Postby dholdgreve » September 9th, 2016, 6:13 am

so... the angle of the columns is actually greater for B than C... interesting.
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Re: Towers B/C

Postby retired1 » September 9th, 2016, 4:00 pm

True, but remember that this person is measuring the angle from the "table" to the leg. So, It has to be more vertical.

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Re: Towers B/C

Postby slowpoke » September 9th, 2016, 5:30 pm

so... the angle of the columns is actually greater for B than C... interesting.
Isn't this true for bridge also? Though there is no height limitation, a B bridge's compression will have a larger angle relative to the table than a C bridge with the same height.
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Re: Towers B/C

Postby bernard » September 9th, 2016, 9:51 pm

so... the angle of the columns is actually greater for B than C... interesting.
Isn't this true for bridge also? Though there is no height limitation, a B bridge's compression will have a larger angle relative to the table than a C bridge with the same height.
A longer bridge has a greater moment. Only the component of force normal to the radius affects the moment. The angles the main structural components make with ground in bridges are typically very different from those for towers.
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slowpoke
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Re: Towers B/C

Postby slowpoke » September 10th, 2016, 9:47 am

so... the angle of the columns is actually greater for B than C... interesting.
Isn't this true for bridge also? Though there is no height limitation, a B bridge's compression will have a larger angle relative to the table than a C bridge with the same height.
A longer bridge has a greater moment. Only the component of force normal to the radius affects the moment. The angles the main structural components make with ground in bridges are typically very different from those for towers.
Hmm..I was just saying that they were similar in that B division bridges would have a larger angle than C division bridges just as in towers. But now that I think about it, how are the angles in towers B greater than C? I'm confused, maybe just about which angles we're talking about...
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Re: Towers B/C

Postby retired1 » September 10th, 2016, 4:12 pm

The angle is measured at the table. The narrower the leg spacing, the greater the angle.
I do not see how this has anything to do with bridges since it is not an event this year.
That said, the more vertical a leg is, the less bracing it requires for most tower construction. Past towers had a wide base with a rather sharp angle to the top "chimney" portion. Because this was a shallower angle it required more bracing.
Not so this year.


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