Boomilever B/C

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knightmoves
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Re: Procedural question related to 4.2.d dealing with adjustments to the boomilever

Post by knightmoves »

saracupp wrote: February 1st, 2020, 1:57 pm When they completed these steps they were instructed to declare "ready to load". At that point a volunteer would check the competition parameters for chain center line between 40 and 45cm and no contact between the boomilever and the testing wall within the contact width lines or below the contact depth line. If a violation was found, the boomilever was ruled to be Tier 2 and the participants were not allowed to make further adjustments.

Restricting further adjustment of the loading assembly or the boomilever's position on the testing wall after speaking the words "ready to load" seems to contradict 4.2.d (below):
The participants will be allowed to adjust the boomilever until they start loading sand. Once loading of sand has begun , the boomilever must not be further adjusted.
Let's examine the possibilities. The ES is required to verify that the boomilever doesn't touch below the depth line or inside the width line, and verify the 40-45cm load point. This has to happen before loading sand, because the boom won't exist afterwards.

This gives us two possibilities: either the ES measures the device, declares it out of bounds, and it's automatically tier 2 (which is what you say happened) or the ES measures the device and then the participants have the opportunity to adjust it until the ES declares it within limits, and they only get tiered if they are unable to adjust their device to fit.

You are wanting to use 4.2.d to claim that the second possibility is the only legal one. I don't think the rules require that - I think a reasonable interpretation is that the "ready to load" declaration is the start of the sand-loading process - but I'd think there's some uncertainty here, so it would be worth submitting a FAQ to get an official clarification.
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Re: Boomilever B/C

Post by newflight »

anyone knows what are those top scores at Solon invitational for division C? or what needs to be in order to get into top 6?
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Re: Boomilever B/C

Post by MadCow2357 »

newflight wrote: February 2nd, 2020, 6:26 pm anyone knows what are those top scores at Solon invitational for division C? or what needs to be in order to get into top 6?
First was 2080 iirc. That's all I know lol
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Re: Boomilever B/C

Post by Tall »

Not sure, if it was asked earlier, how do we build the testing assembly, especially the closing lever mechanism for the sand?
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Re: Boomilever B/C

Post by nnaya »

I am a bit new to the event although I have done towers before. I would appreciate your insight.
I have a problem with my compression segment always breaking. I'm not able to get beyond 9-10kg. It usually just seems to bend and break at different points somewhere between middle and base. I've tried going thicker on the main compression segments as well. My tension segments are basswood strips and seem to be able to hold more weight. How do you guys construct your boom? Maybe I am missing something basic! :oops:
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Re: Boomilever B/C

Post by MadCow2357 »

nnaya wrote: February 4th, 2020, 6:10 pm I am a bit new to the event although I have done towers before. I would appreciate your insight.
I have a problem with my compression segment always breaking. I'm not able to get beyond 9-10kg. It usually just seems to bend and break at different points somewhere between middle and base. I've tried going thicker on the main compression segments as well. My tension segments are basswood strips and seem to be able to hold more weight. How do you guys construct your boom? Maybe I am missing something basic! :oops:
Can you give more information on your boomilever (what type of design, what sizes of wood, etc.)? That'll be essential for diagnosing your problem
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Re: Boomilever B/C

Post by nnaya »

Thank you Mad cow!
It's a box beam design with 1/8 x 1/4 pieces with 1/16 x 1/16 cross bracing for the compression segment.
I was trying 1/8 x 1/8 with 1/16 bracing initially and then upgraded to 1/8 x 1/4 but still had failure around the same weight :(
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Re: Boomilever B/C

Post by MadCow2357 »

nnaya wrote: February 5th, 2020, 4:22 am Thank you Mad cow!
It's a box beam design with 1/8 x 1/4 pieces with 1/16 x 1/16 cross bracing for the compression segment.
I was trying 1/8 x 1/8 with 1/16 bracing initially and then upgraded to 1/8 x 1/4 but still had failure around the same weight :(
I assume you mean tower chimney, right? Or do you mean literal box beam (hollow compression beams)? 1/4 by 1/8 shouldn't be needed if you are using tower chimney (which has 4 main compression beams). Full weight can be achieved with less. What are your bracing intervals?
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Re: Boomilever B/C

Post by nnaya »

Yes 4 main segments with cross bracing. Top and bottom of the tower when the boom is hanging on the hook, are parallel to each other, as well as to the floor. Left and Right are angled from base to the loading block like a tower. Is that called a tower chimney? :?:
Bracing on sides and top are about 2 cm apart. I build it on a jig. Thank you.
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Re: Boomilever B/C

Post by Chameleon02 »

So I have a question for you guys, if you wouldn't mind sharing. I have been achieving moderate success with the tower chimney or box beam design and plan on pursuing it for the rest of the season. However, I had a question about the height of the box beam. I have tried various heights, from 2-3cm, but have yet to hold full. How tall are you guys making the chimneys (looking at it from the side view when attached to the wall). I would love some feedback or even a range. I have been using four 3/32x pieces for my box beam, and brace it at eight intervals. The weight is usually around 12-14 grams. Capped at 13kg for loading, which is frustrating me. It always fails from the beam buckling or collapsing, and I do not think I need any more bracing intervals. Tension pieces are strong.
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