Scioly.org

https://scioly.org/wiki/index.php/Boomilever
Here is a good place to start.

pajobubo wrote:I’m confused about how we have to build the boomilever so it can attach to the wall. Or I guess what the little piece to attach to wall looks like. Can we just google the rules from past or do you guys just have them?

As of the 2014 switch to a hook rather than a bolt, the top part is typically a rod parallel to the wall which just hangs onto the hook. The bottom part rests against the wall freely.

So what type of wood are you guys going to use for your mounting pieces?

MadCow2357 wrote:So what type of wood are you guys going to use for your mounting pieces?

I think that will totally depend on what they come up with as a means of attachment. In years past, we have done both laminated flat bases that bolt to the vertical wall, and non-laminated dowels that hook behind the eye hook. In both cases, we used medium to dense balsa.

dholdgreve wrote:

MadCow2357 wrote:So what type of wood are you guys going to use for your mounting pieces?

I think that will totally depend on what they come up with as a means of attachment. In years past, we have done both laminated flat bases that bolt to the vertical wall, and non-laminated dowels that hook behind the eye hook. In both cases, we used medium to dense balsa.

I agree. Balsa will be my first try but I'll most likely go bass.

Note that heavy balsa and basswood have about the same tensile strength. Quality of the wood will be a major difference. All balsa and all basswood have won in the past.

I have started (and possibly finished) two boomilever prototypes (ie ones that may not exactly fit length reqs by maybe 2 cm.) Do u think it is better to go with the simple, basic design, or the triangular pyramid design? I think the latter of my two is much lighter+stronger.
As for wood, i guess u could say im in the 'elite', 'cause i use both woods.

What are you calling a simple basic design and what are you calling a pyramid design. PM me a sketch with dimensions of both and I will put it on my 3D computer program. Also wood weights per CF of each. prefer lb/cf

I will get back to u on that, just give me a few. As for the simple design, just look at the wiki. Mine is basically that, but with very thick compression and thinner basswood tension pieces. For the triangular pyramid, it's literally a triangular pyramid with two right triangle faces, one acute/isoceles face. My cross bracing is INCREDIBLY complicated and i dont want to draw it. its summer vacation. If u don't know what one of those looks like, i can't help u. look it up. Also, i am informally building, so i haven't actually drawn these designs up. i have not checked my wood weights, as it is not reg. season and im not actually using these in comp. im only div. B dude.



On a different note, it weighs a bit north of nine grams, and should get an efficiency of ~1200???? Haven't tested.

What do u guys thing a winner would look like??? What would its score be?

triangulator wrote: What do u guys thing a winner would look like??? What would its score be?

Looking at 2014 Nationals scores for Boomilever:
1: 2322
6: 1469
10: 1294
Obviously the rules are different, but you can probably get an idea by looking at the 2014 rules parameters/dimensions and predicting if you think efficiencies will be higher or lower. I don't personally have much experience with Balsa so I won't try to make any predictions, but I'd be interested to hear someone who does have experience try to make a prediction.