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GeorgeInNePa wrote:

Balsa Man wrote:Thanks.
"The numbers" definately indicate a tube at 1/16th wall, at that weight, could hold all, w/ a significant safety factor.
Hope that score holds up for a medal.

We'll do some experimenting over the Summer for next year. We need to perfect our mount and work on a jig for aligning the holes.

I heard Shady Side just went over 1600 in the second time-slot...

Im not sure if it was 1600 or not... According to the mass they told me it held, it got a 1600, but as I was walking out they were saing something about it being 1770. If the mass they told me was strictly sand, and they added the bucket mass after than 1770 would fit. Also, when i was watching a boomilever it held total 15kg, but there was still a little sand left, so i a mnot sure.

GeorgeInNePa wrote:

Balsa Man wrote:Thanks.
"The numbers" definately indicate a tube at 1/16th wall, at that weight, could hold all, w/ a significant safety factor.
Hope that score holds up for a medal.

We'll do some experimenting over the Summer for next year. We need to perfect our mount and work on a jig for aligning the holes.

I heard Shady Side just went over 1600 in the second time-slot...

ETA:
Ours was good for for 3rd, behind Shady Side and Strath Haven (13xx)...

Yeah, we (Strath Haven) got a 1,320. If it had held the full bucket, it would have gotten just below 1600. It broke right at the point where the compression piece touches the wall, so stronger bracings there will be necessary for Nationals.

Anyway, I purposefully overbuilt it to hold the full load (with a couple of extra bracings I think it could have..), but at Nationals I'll be going all out .

And Shady Side, from what I heard, you guys got a 1600

ckssv07 wrote:

GeorgeInNePa wrote:

Balsa Man wrote:Thanks.
"The numbers" definately indicate a tube at 1/16th wall, at that weight, could hold all, w/ a significant safety factor.
Hope that score holds up for a medal.

We'll do some experimenting over the Summer for next year. We need to perfect our mount and work on a jig for aligning the holes.

I heard Shady Side just went over 1600 in the second time-slot...

Im not sure if it was 1600 or not... According to the mass they told me it held, it got a 1600, but as I was walking out they were saing something about it being 1770. If the mass they told me was strictly sand, and they added the bucket mass after than 1770 would fit. Also, when i was watching a boomilever it held total 15kg, but there was still a little sand left, so i a mnot sure.

I'm pretty sure there is actually more than a total of 15kg in weight for the bucket, chain/block/etc, and sand. But you only get credit for 15kg.

We held 10.77kg, i just need to glue the compression joints a bit better because thats the only thing that broke.
It should also work a lot better if tested with an autotester, so i want to see if i can get a 2000.

can anyone explain a tube boom to me?

First, thanks (havneguy, ckssv07, and george) for sharing the....competitive landscape in PA. For sure a notch above what it is in CO. Congrats to all the medalists. Getting above 1200 is a real accomplishment. It'll be really interesting to see what kind of numbers come in from OH today.

Wish I could make it to Nats to see and meet, but that isn't going to happen. I am, however, looking forward to working with Preston MS, from here in Fort Collins to see how far... the tube can be taken.

Balsa, when you ask for a tube boom to be "explained", I'm not sure what you mean.....
There's now a picture that explains - shows what one looks like; there is a lot of discussion explaining underlying concept, theoretical advantages, ways of building, design variations that are appearing; its pretty much all here. Something specific you were wondering about?

For the state competition in Pennsylvania in division C the winning efficiency was around the mid 1200's, and that was by Harriton, It held somewhere near 11kg and in the mid to high 9 gram range. Sorry I don’t remember the exact specifics just wanted to share what general score was for division C.

Balsa Man wrote:First, thanks (havneguy, ckssv07, and george) for sharing the....competitive landscape in PA. For sure a notch above what it is in CO. Congrats to all the medalists. Getting above 1200 is a real accomplishment. It'll be really interesting to see what kind of numbers come in from OH today.

Wish I could make it to Nats to see and meet, but that isn't going to happen. I am, however, looking forward to working with Preston MS, from here in Fort Collins to see how far... the tube can be taken.

Balsa, when you ask for a tube boom to be "explained", I'm not sure what you mean.....
There's now a picture that explains - shows what one looks like; there is a lot of discussion explaining underlying concept, theoretical advantages, ways of building, design variations that are appearing; its pretty much all here. Something specific you were wondering about?

what do you mean when you refer to "wall tube"?

Um, I made references to tube wall- as in wall thickness- talking about the thickness of the material forming the tube- as in outside diameter minus inside diameter. I talked about we're using 1/32nd; George said they were using 1/16th....

Does anyone know the scores from ohio