Boomilever B/C

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TheSquaad
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Re: Boomilever B/C

Postby TheSquaad » January 5th, 2019, 8:56 am

Vstorm34 wrote:
Cow481 wrote:Wouldn’t it be easier and more effective to just drill a hole and gorilla glue the tension pieces to the dowel rod?


If the tension is a square piece of wood and not round then using a drilled hole will reduce the surface area of the joint. A notch will a allow for more coverage since the flat edges will have more contact with the wood.


What if you rounded the end of the tension member so it was flush with the drilled hole

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Re: Boomilever B/C

Postby Vstorm34 » January 5th, 2019, 12:05 pm

TheSquaad wrote:
Vstorm34 wrote:
Cow481 wrote:Wouldn’t it be easier and more effective to just drill a hole and gorilla glue the tension pieces to the dowel rod?


If the tension is a square piece of wood and not round then using a drilled hole will reduce the surface area of the joint. A notch will a allow for more coverage since the flat edges will have more contact with the wood.


What if you rounded the end of the tension member so it was flush with the drilled hole


That's definitely possible. Though depending on the starting thickness of the wood, sanding too much off to create a perfect circle might leave that end much more brittle than the rest of the piece. If that happens then the tension will just break instead of the joint failing.

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Re: Boomilever B/C

Postby FermiGod » January 9th, 2019, 7:36 am

out of curiosity, if a boomilever is built and ready to go but somehow the tension arm cracks and is wiggly what would be the best option? im wondering because i know in other balsa events people just bring extra wood and just pop it out but for boomilever you cant really take out the tension pieces. This is just an if scenario but im curious

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Re: Boomilever B/C

Postby TheSquaad » January 10th, 2019, 5:06 am

FermiGod wrote:out of curiosity, if a boomilever is built and ready to go but somehow the tension arm cracks and is wiggly what would be the best option? im wondering because i know in other balsa events people just bring extra wood and just pop it out but for boomilever you cant really take out the tension pieces. This is just an if scenario but im curious


If a tension member ever broke, I’d put balsa strips on all 4 sides of the break to re-straighten it, as though it were a cast.

A better solution for competitions is just bring 2 boomis.

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Re: Boomilever B/C

Postby dholdgreve » January 11th, 2019, 1:31 pm

FermiGod wrote:out of curiosity, if a boomilever is built and ready to go but somehow the tension arm cracks and is wiggly what would be the best option? im wondering because i know in other balsa events people just bring extra wood and just pop it out but for boomilever you cant really take out the tension pieces. This is just an if scenario but im curious


Boy, this is what I'd have to call a "Catastrophic Failure." If your tension rod goes on one side, I'm not even sure it could carry the 3kg to keep you in Tier 1. If it were broken at the competition I guess you'd have no choice but to patch as recommended by squaad... but if it happened before a competition, i'd be rebuilding from scratch.
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Re: Boomilever B/C

Postby Cow481 » January 11th, 2019, 4:52 pm

dholdgreve wrote:
FermiGod wrote:out of curiosity, if a boomilever is built and ready to go but somehow the tension arm cracks and is wiggly what would be the best option? im wondering because i know in other balsa events people just bring extra wood and just pop it out but for boomilever you cant really take out the tension pieces. This is just an if scenario but im curious


Boy, this is what I'd have to call a "Catastrophic Failure." If your tension rod goes on one side, I'm not even sure it could carry the 3kg to keep you in Tier 1. If it were broken at the competition I guess you'd have no choice but to patch as recommended by squaad... but if it happened before a competition, i'd be rebuilding from scratch.

Also a reson why backup boomilevers are important
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Re: Boomilever B/C

Postby DarthBuilder » January 12th, 2019, 2:33 pm

If you guys thought 3 minutes of sand loading is bad today at UChicago was 15 minutes for full load!
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Re: Boomilever B/C

Postby PM2017 » January 12th, 2019, 4:41 pm

DarthBuilder wrote:If you guys thought 3 minutes of sand loading is bad today at UChicago was 15 minutes for full load!

Rip stick-holders' knees.
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Re: Boomilever B/C

Postby MadCow2357 » January 12th, 2019, 7:08 pm

PM2017 wrote:
DarthBuilder wrote:If you guys thought 3 minutes of sand loading is bad today at UChicago was 15 minutes for full load!

Rip stick-holders' knees.

Yes big oof... Question: why didn't the Event Supervisors stop the teams from continuing to load?
Last edited by MadCow2357 on January 12th, 2019, 7:49 pm, edited 1 time in total.
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Re: Boomilever B/C

Postby DarthBuilder » January 12th, 2019, 7:31 pm

MadCow2357 wrote:
PM2017 wrote:
DarthBuilder wrote:If you guys thought 3 minutes of sand loading is bad today at UChicago was 15 minutes for full load!

Rip stick-holders' knees.

Yes big oof... Question: why didn't the Event Supervisors stopping the team from continuing to load?


While I was talking to the few supervisors during a time slot I believe it was the same reason as Centerville. They wanted to see how booms would last in a long period of time. So they removed the 6 minute rule but everything went smoothly and finished on time.
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Re: Boomilever B/C

Postby parikhy » January 13th, 2019, 11:38 am

Any feedback on our boomilever wood sizes?. We're thinking to use 1/8 for the main members and then 3/32 for the bracing. Will it be sturdy enough? We're using a compression boomilever.

If not, what wood should we buy? We are only using balsa right now but we could buy bass wood if it would help.

In division C, by the way.
Last edited by parikhy on January 13th, 2019, 11:50 am, edited 1 time in total.

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Re: Boomilever B/C

Postby TheChiScientist » January 13th, 2019, 11:50 am

MadCow2357 wrote:
PM2017 wrote:
DarthBuilder wrote:If you guys thought 3 minutes of sand loading is bad today at UChicago was 15 minutes for full load!

Rip stick-holders' knees.

Yes, big oof... Question: why didn't the Event Supervisors stop the teams from continuing to load?

Oh, the stick-holder wasn't nearly in as much pain as the person pushing down on the bootleg lever to release the sand at a rate of 1kg per minute...
Also sucked for our cameraman as he had to get a good angle to get us a 52 min slow-mo video after recording for 10 minutes straight. :lol:
Oh, also my boom held 10kg so my hands are still sore from holding down that lever for 10 minutes straight... :(
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Re: Boomilever B/C

Postby MadCow2357 » January 13th, 2019, 12:52 pm

parikhy wrote:Any feedback on our boomilever wood sizes?. We're thinking to use 1/8 for the main members and then 3/32 for the bracing. Will it be sturdy enough? We're using a compression boomilever.

If not, what wood should we buy? We are only using balsa right now but we could buy bass wood if it would help.

In division C, by the way.

It all depends on bracing, but in normal cases 1/8 square is definitely not enough. At least 1/4" by 1/8" is needed for the main compression beams. I wouldn't go over 1/16" square for bracing.
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Re: Boomilever B/C

Postby sciencecat42 » January 13th, 2019, 2:11 pm

MadCow2357 wrote:
parikhy wrote:Any feedback on our boomilever wood sizes?. We're thinking to use 1/8 for the main members and then 3/32 for the bracing. Will it be sturdy enough? We're using a compression boomilever.

If not, what wood should we buy? We are only using balsa right now but we could buy bass wood if it would help.

In division C, by the way.

It all depends on bracing, but in normal cases 1/8 square is definitely not enough. At least 1/4" by 1/8" is needed for the main compression beams. I wouldn't go over 1/16" square for bracing.


Depends on design. If you are only using 2 main compression sticks, 1/8" is not enough. However for box designs (4 sticks), it is sufficient.

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Re: Boomilever B/C

Postby TheChiScientist » January 13th, 2019, 4:46 pm

Is there a rule against a Boomilever being tiered due to it being over 45cm?????? I received a tier for this yet as I review the construction parameters there is no such rule! Only Section 3 Subsection C states "The Boomilever must support the Loading Assembly (5.b.) at the loading point which must be between 40 cm and 45 cm from the testing wall (4.Part II.e.ii.)." but my Boomilever was in compliance with this rule! :evil: Am I missing something!! Please help! :cry:
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