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Re: Boomilever B/C
Posted: February 25th, 2014, 4:12 am
by UQOnyx
whoa what!? nxtscholar, how would you make one yourself!?
Re: Boomilever B/C
Posted: February 25th, 2014, 5:05 pm
by sjwon3789
GeorgeInNePa wrote:
1) See the hole in the tube at the distal end? The loading block eye-bolt goes through there.
2) The tube is hollow. It's 1/16" balsa, soaked in water and "wrapped" around a piece of 1/2" copper water pipe.
3) The tension member goes through the tube and is glued into a wooden "plug", coincidentally, the loading block also bears on the same block.
4) We've had good luck with 1/16" balsa. The finished booms usually weigh 10.5g to 11.5g, depending on the sheet density. I want to test some 1/32" this year.
We will be testing a tube at the Rustin Invitational tomorrow. It's heavy, over 13g...
This is kinda old but information pertaining to the tube booms, isn't copper water pipe banned...? And how would you "wrap" around the wood..
Re: Boomilever B/C
Posted: February 25th, 2014, 5:59 pm
by chinesesushi
sjwon3789 wrote:GeorgeInNePa wrote:
1) See the hole in the tube at the distal end? The loading block eye-bolt goes through there.
2) The tube is hollow. It's 1/16" balsa, soaked in water and "wrapped" around a piece of 1/2" copper water pipe.
3) The tension member goes through the tube and is glued into a wooden "plug", coincidentally, the loading block also bears on the same block.
4) We've had good luck with 1/16" balsa. The finished booms usually weigh 10.5g to 11.5g, depending on the sheet density. I want to test some 1/32" this year.
We will be testing a tube at the Rustin Invitational tomorrow. It's heavy, over 13g...
This is kinda old but information pertaining to the tube booms, isn't copper water pipe banned...? And how would you "wrap" around the wood..
You remove the copper thing to make a hollow tube. And you soak it so you can wrap it around. GeorgeInPA or anyone else, how long do you soak in the water for?
Re: Boomilever B/C
Posted: February 25th, 2014, 9:05 pm
by DoctaDave
xchampkevin wrote:1st Mesa Robles, 2nd Chapparal, 3rd (us) Suzanne
Do you remember what kind of boomilever Mesa Roble used? (Box, tube, normal etc.)
Re: Boomilever B/C
Posted: February 26th, 2014, 11:33 am
by xchampkevin
I think it was a box, held all the weight.
Re: Boomilever B/C
Posted: February 26th, 2014, 3:24 pm
by embokim
What is a goid score,
Re: Boomilever B/C
Posted: February 26th, 2014, 4:21 pm
by chinesesushi
embokim wrote:What is a goid score,
depends on region. usually >1000 pretty much guarantees a place. anything >1500 is probably top 1 or 2 in state/regional.
Re: Boomilever B/C
Posted: February 26th, 2014, 8:43 pm
by xAkali
xchampkevin wrote:I think it was a box, held all the weight.
and it got a score of 1800? that's ridiculous. Was it just a simple box?
Re: Boomilever B/C
Posted: February 27th, 2014, 9:44 am
by UQOnyx
He means a box beam boomilever, depending on how it's made, an extremely efficient design.
Re: Boomilever B/C
Posted: February 27th, 2014, 11:42 am
by Can_Of_Tuna
Would a boomilever with a triangular compression box be a good idea?
Also, I realized the problem with my elliptical boomilever. I cut the bent pieces too short, and thus they simply sat there instead of actively pushing against the ends of the boom.
The proctor also had the mounting hooks two inches out, instead of the correct one. My teammates and I only realized this after the competition, though.