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Boomilever B/C: Teams will design and build a Boomilever meeting requirements specified in the rules supporting a minimum load and to achieve the highest structural efficiency.

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Past Threads: 2013, 2014

What would be specified as the loading point, the middle, front, or end of the loading block?

Cow481 wrote:What would be specified as the loading point, the middle, front, or end of the loading block?

The centerline of the chain, as per Section 4, part II, rule e.ii.

The Boomilever rules are 3 pages long! Crazy.

Also, they tried to eliminate "ultralight" structures that were present in towers last year by tiering anything below 3000g. This seems odd to me though, considering there is no bonus like there was last year. The mathematical advantage of the bonus was a much greater contributor to the presence of "ultralights" than any sort of mechanical advantage, if I understand correctly.

That's correct, but it is also much easier to build a light boomilever than light tower.

Took me a while to process them but I like how it will pan out. My only confusion is how the J-hook will work...

Yeah, it's totally going to mess up my triangular design.

TheChiScientist wrote:Took me a while to process them but I like how it will pan out. My only confusion is how the J-hook will work...

Check out the 2014 forum discussions on Boomilever. I believe they have found a good way to do this.

I saw this design called a "compression beam" on the scioly wiki where it is basically 2 tension sticks attached to a hollow cylinder of balsa wood instead of your standard compression member. The wiki also said that it can be very competitive. I was wondering how you would go about constructing this, and whether or not it would be effective. Working with a drill on a boomilever seems a little... overpowered. Also, what are the estimated competitive weights this ear? For towers the competitive ones were ~ 6-7 g, but it seems like you could make a very light boomilever.

Sciencer101 wrote:I saw this design called a "compression beam" on the scioly wiki where it is basically 2 tension sticks attached to a hollow cylinder of balsa wood instead of your standard compression member. The wiki also said that it can be very competitive. I was wondering how you would go about constructing this, and whether or not it would be effective. Working with a drill on a boomilever seems a little... overpowered. Also, what are the estimated competitive weights this ear? For towers the competitive ones were ~ 6-7 g, but it seems like you could make a very light boomilever.

The cylinder would be made by taking a sheet and rolling it (there's a process involving soaking it in warm water/steam, although I don't know the details). It's quite difficult, both because the construction takes a long time and is very delicate, and it's quite a challenge to find a uniform sheet that's strong enough.

Boomilever scores tend to be lower. As a general rule of thumb, I would take Towers scores from last year and divide them by 2 to get roughly equivalent boomilever scores.