Boomilever B/C

[knightmoves]

When we run a competition the estimated load held is given verbally to the check-in specialists. This may vary by competition.

I wonder if anyone has ever seen the estimated load actually used? It's there as a tiebreaker only, and the odds of getting the same answer for the ratio of mass held to mass of boomi for two different devices are rather slim.

[donutsandcupcakes]

We are doing Boomilever for the first time and not sure of couple of rules.
1. Do we need to prepare/submit log book for competition?
2. How do we submit the Estimated Loading Supported to the officials at the event? Is it verbal or do we need to write it down as in log?

No log is actually "required" by national rules in Boomilevers, but if you are not keeping one, you are really doing yourself a disservice.
When we run a competition the estimated load held is given verbally to the check-in specialists. This may vary by competition.

1.Like @dholdgreve said, logbook isn't required, but it helps you keep track of what you are using and just basic information you might want to remember while building your next boomilever.
2.For the estimated load score, in our tournaments they give us a sheet(which is also our score sheet) on which we just write down how much weight we think we will hold. In short, they let us write our estimated load score.

Hope that helps,
donutsandcupcakes

[geedee]

How are scores looking so far? I'm kinda stuck at 1000 but I'm trimming the mass down.

I've heard reports of someone breaking 2.7k

Can confirm.

Was this Div B or Div C?
Saw one that broke 2.7k (Div B) but was tier 2 because ES measured barely less than 40cm with a wooden yardstick to which was loosely taped IKEA paper measuring tape that didn't start zero at the wall, but 2 mm out.

But it held full load, very interesting design.

[ryanscioly]

Hey everyone, I just tested my first ever boomi and it held the max 15 kg no problem and it weighted 20g . I made everything on it a little big, so I was wondering what sized wood I should use on my next boomi to make it lighter. I’m using a tower chimney design with 3/16” square balsa sticks for the main beams, 1/8” x 3/32” sticks for the bracing between the beams (shaped like “IXI”), and 1/8” square bass sticks for the tension pieces. Which pieces should I make smaller without compromising overall strength? Thanks for any help in advance!

[RobertYL]

I've heard reports of someone breaking 2.7k

Can confirm.

Was this Div B or Div C?

Division C.

Which pieces should I make smaller without compromising overall strength?

You can definitely lower the dimensions of the bracings (1/32" thickness) and of the tensions (at least by half, in terms of the cross-sectional area). There are two ways you can go with bracing, either a few, heavy pieces or many, lighter pieces. I am generally a proponent of a lot of smaller bracings as balsa density/strength is highly variable.

[PayalParikh]

Hey everyone, I just tested my first ever boomi and it held the max 15 kg no problem and it weighted 20g . I made everything on it a little big, so I was wondering what sized wood I should use on my next boomi to make it lighter. I’m using a tower chimney design with 3/16” square balsa sticks for the main beams, 1/8” x 3/32” sticks for the bracing between the beams (shaped like “IXI”), and 1/8” square bass sticks for the tension pieces. Which pieces should I make smaller without compromising overall strength? Thanks for any help in advance!

Can you please let us know what glue you used?

[ryanscioly]

Hey everyone, I just tested my first ever boomi and it held the max 15 kg no problem and it weighted 20g . I made everything on it a little big, so I was wondering what sized wood I should use on my next boomi to make it lighter. I’m using a tower chimney design with 3/16” square balsa sticks for the main beams, 1/8” x 3/32” sticks for the bracing between the beams (shaped like “IXI”), and 1/8” square bass sticks for the tension pieces. Which pieces should I make smaller without compromising overall strength? Thanks for any help in advance!

Can you please let us know what glue you used?

I only used medium and thin ca glue. You can learn more about types of glue here: https://scioly.org/wiki/index.php/Aia%2 ... Guide#Glue

[jgrischow1]

I'm sure this has been asked before but I can't readily find it. What's the best use of a tested boom that held the whole load? My kids are a little unsure of some of the dimensions so we are thinking about just taking it apart and weighing/reweighing sfpding/re-sfpding each piece and using that info to figure out how to get lighter. Anything else? Use it as a backup? Keep adding sand til it breaks? Put it in the trophy case? Burn it?

[Anonymous15]

Hey everyone,
Does anybody know how viable 1/16 square tension members are for Division C this year? I'm using 3/32 square tension members this year, but I'd like to reduce as much as I can. Thanks!

[Anonymous15]

I'm sure this has been asked before but I can't readily find it. What's the best use of a tested boom that held the whole load? My kids are a little unsure of some of the dimensions so we are thinking about just taking it apart and weighing/reweighing sfpding/re-sfpding each piece and using that info to figure out how to get lighter. Anything else? Use it as a backup? Keep adding sand til it breaks? Put it in the trophy case? Burn it?

I usually use mine as backups if I don't have time to build fresh backups for competition. Otherwise, all boomis are probably useful to analyze failure points post-testing (or just for general reference). That being said, I'm sure others here can give a more detailed answer lol. Hope this helps!