Re: Boomilever B/C
Posted: March 7th, 2013, 7:51 pm
No offense, but I don't believe you.mrburrito wrote:No actually, it is less than five grams, and doesn't hold all fifteen kilograms.
Page 54 of 63
Re: Boomilever B/C
Posted: March 8th, 2013, 6:41 am
Yup, I'm going to call "bull."soccerkid812 wrote:No offense, but I don't believe you.mrburrito wrote:No actually, it is less than five grams, and doesn't hold all fifteen kilograms.
Anybody who has actually built a 1,000 point+ boom has some feel for what it would take to more than triple the efficiency
Re: Boomilever B/C
Posted: March 8th, 2013, 8:58 am
I highly doubt that a div. b boom actually could get that. Even if it could hold all of that weight, it seems pretty ridiculous. 100% agree with Balsa Man
Re: Boomilever B/C
Posted: March 8th, 2013, 11:10 am
3000+ seems unattainable, but the last cycle at national, people got to 2500+ with very similar rules. It probably comes down to a very simple design and very well selected pieces for the main beam. And in theory, b div boom should be able to do better than c when building skill is not taken into account.
Re: Boomilever B/C
Posted: March 8th, 2013, 12:00 pm
OK, let's compartmentalize... the mounting block will be 1.0 gram +/-, the compressive members, be it box beam, trussed beams, or solid beams, will weigh 3.5 grams +/-, the tensile members will weigh 2.0 grams +/-... now add any type of bracing in the Y axis, another 1.0 grams for both sides?... That's 7.5 grams, and I can't see it being any lighter and standing any chance of carrying the full load... That would pretty much set the max at 2,000 points... hard to imagine anything higher than that!
Re: Boomilever B/C
Posted: March 8th, 2013, 3:49 pm
Bases can be less than half that weight, and no compression is needed in the y direction, which makes it 6g, still not 5...
Re: Boomilever B/C
Posted: March 8th, 2013, 4:58 pm
Okay, okay all tall tales or not so tall tales, I have a serious question/concern. When building the compression, how stiff should compression cross X bracings be? I finally got my shipment of 1/16 x 1/16 balsa (36 pack- free wood anyone 
?) and I found the lightest pieces, but my concern is how flimsy they are. They are about .3 grams and their buckling load is like less than three grams. Should I use denser wood or keep these?
?) and I found the lightest pieces, but my concern is how flimsy they are. They are about .3 grams and their buckling load is like less than three grams. Should I use denser wood or keep these?Re: Boomilever B/C
Posted: March 8th, 2013, 6:29 pm
The bracing can be hard to model, my theory is that you should just try it and find out, but .3g is in the range of stuff I've been using and it works fine 
Re: Boomilever B/C
Posted: March 8th, 2013, 7:24 pm
Thanks... Our States are on Tuesday...(NJ Ftw ) so I don't really have much time to test if you know what I mean. Now, I am just making my backup and main. Pretty nervous 
) so I don't really have much time to test if you know what I mean. Now, I am just making my backup and main. Pretty nervous Re: Boomilever B/C
Posted: March 8th, 2013, 7:40 pm
Bases less than 0.5g? Is this using Aia's method?iwonder wrote:Bases can be less than half that weight, and no compression is needed in the y direction, which makes it 6g, still not 5...
Mine is 1.0+g.