Boomilever B/C

TheSquaad
Member
Member
Posts: 57
Joined: March 18th, 2017, 5:14 pm
Division: C
State: MA
Contact:

Re: Boomilever B/C

Postby TheSquaad » December 5th, 2018, 6:49 am

Cow481 wrote:
TheSquaad wrote:
MadCow2357 wrote:Build as many booms as possible... build at least 1 every 2 weeks...


I’d even shoot for 1 or 2 a week if you’re really looking to make progress. And make sure that you’re modifying your design in stages. For example, if you had a compression failure, you shouldn’t strengthen your compression members and lighten up on your tensions because then you may get a tension failure and have to retest that compression modification.

Also slow mo all the testing and go frame by frame to see the exact point of failure


Get a galaxy s9 to record your boomi breaking in sweet 960fps

User avatar
BenW
Member
Member
Posts: 2
Joined: December 1st, 2018, 8:37 pm
Division: C
State: -
Contact:

Re: Boomilever B/C

Postby BenW » December 5th, 2018, 8:52 am

TheSquaad wrote:Get a galaxy s9 to record your boomi breaking in sweet 960fps


Or instead of getting a $1000+ phone, get a ~$250 digital camera that can do that.
Started in 2015, skipped 3 years, restarted in 2018. Hope I'll keep doing this until college! I hope my team does well. Remember: MEDALS FROM REGIONAL AND ABOVE CAN BE USED ON COLLEGE RESUMES FOR DIVISION C! Good luck!

nambui0701
Member
Member
Posts: 4
Joined: November 28th, 2017, 1:10 pm
State: -
Contact:

Re: Boomilever B/C

Postby nambui0701 » December 5th, 2018, 1:18 pm

Hey guys :) I am a new member of SO and Boomilever event. May I ask if there is any mathematical / engineering approach to building the Boomilever instead of just blindly building and testing?

Much appreciate any answer.

User avatar
klastyioer
Member
Member
Posts: 54
Joined: April 22nd, 2018, 4:46 pm
Division: C
State: PA
Contact:

Re: Boomilever B/C

Postby klastyioer » December 5th, 2018, 1:57 pm

nambui0701 wrote:Hey guys :) I am a new member of SO and Boomilever event. May I ask if there is any mathematical / engineering approach to building the Boomilever instead of just blindly building and testing?

Much appreciate any answer.


i mean yes there is a lot of math involved in boomilevers. in fact, if you are in high school and you take a mechanics course, that will help you a LOT in boomi. but blindly building isnt that bad. if you know how your device and you can find the greatest weakness spots on the device, you can get anywhere in this event. don't be afraid to experiment, especially with event. try different shapes, cross sections, wood, wood thickness/weights, glues, etc. always double check your measurements and be sure to be precise with each and every piece on there. oh and also dont use too much glue, the whole point of it is to be light but strong. let me know how it goes!
honestly, it's not about the medals. go out there and have fun. make progress, learn a few things, have one heck of a time, because that's all that matters.

TheSquaad
Member
Member
Posts: 57
Joined: March 18th, 2017, 5:14 pm
Division: C
State: MA
Contact:

Re: Boomilever B/C

Postby TheSquaad » December 5th, 2018, 3:31 pm

klastyioer wrote:
nambui0701 wrote:Hey guys :) I am a new member of SO and Boomilever event. May I ask if there is any mathematical / engineering approach to building the Boomilever instead of just blindly building and testing?

Much appreciate any answer.


i mean yes there is a lot of math involved in boomilevers. in fact, if you are in high school and you take a mechanics course, that will help you a LOT in boomi. but blindly building isnt that bad. if you know how your device and you can find the greatest weakness spots on the device, you can get anywhere in this event. don't be afraid to experiment, especially with event. try different shapes, cross sections, wood, wood thickness/weights, glues, etc. always double check your measurements and be sure to be precise with each and every piece on there. oh and also dont use too much glue, the whole point of it is to be light but strong. let me know how it goes!

User avatar
MadCow2357
Member
Member
Posts: 257
Joined: November 19th, 2017, 9:09 am
Division: B
State: RI
Location: Stark Industries Internship
Contact:

Re: Boomilever B/C

Postby MadCow2357 » December 5th, 2018, 3:35 pm

TheSquaad wrote:
klastyioer wrote:
nambui0701 wrote:Hey guys :) I am a new member of SO and Boomilever event. May I ask if there is any mathematical / engineering approach to building the Boomilever instead of just blindly building and testing?

Much appreciate any answer.


i mean yes there is a lot of math involved in boomilevers. in fact, if you are in high school and you take a mechanics course, that will help you a LOT in boomi. but blindly building isnt that bad. if you know how your device and you can find the greatest weakness spots on the device, you can get anywhere in this event. don't be afraid to experiment, especially with event. try different shapes, cross sections, wood, wood thickness/weights, glues, etc. always double check your measurements and be sure to be precise with each and every piece on there. oh and also dont use too much glue, the whole point of it is to be light but strong. let me know how it goes!

Squad was your post intended to agree with klastyioer or something? :?:
MadCow2357's Userpage
2019 Events: Battery Buggy, Boomilever, Fossils, Thermodynamics
"Son, if you really want something in this life, you have to work for it. Now quiet! They're about to announce the lottery numbers." - Homer Simpson
Rest in peace Balsa Man. You were a great man. :cry:

User avatar
klastyioer
Member
Member
Posts: 54
Joined: April 22nd, 2018, 4:46 pm
Division: C
State: PA
Contact:

Re: Boomilever B/C

Postby klastyioer » December 5th, 2018, 3:44 pm

MadCow2357 wrote:
TheSquaad wrote:
klastyioer wrote:
i mean yes there is a lot of math involved in boomilevers. in fact, if you are in high school and you take a mechanics course, that will help you a LOT in boomi. but blindly building isnt that bad. if you know how your device and you can find the greatest weakness spots on the device, you can get anywhere in this event. don't be afraid to experiment, especially with event. try different shapes, cross sections, wood, wood thickness/weights, glues, etc. always double check your measurements and be sure to be precise with each and every piece on there. oh and also dont use too much glue, the whole point of it is to be light but strong. let me know how it goes!

Squad was your post intended to agree with klastyioer or something? :?:


lol yeah im confused...
honestly, it's not about the medals. go out there and have fun. make progress, learn a few things, have one heck of a time, because that's all that matters.

TheSquaad
Member
Member
Posts: 57
Joined: March 18th, 2017, 5:14 pm
Division: C
State: MA
Contact:

Re: Boomilever B/C

Postby TheSquaad » December 6th, 2018, 5:33 am

klastyioer wrote:
MadCow2357 wrote:
TheSquaad wrote:

Squad was your post intended to agree with klastyioer or something? :?:


lol yeah im confused...


I think my message somehow got deleted before I posted lol.

I was going to suggest looking at Euler’s critical load. You don’t have to actually use the formula to calculate anything, but it’s principles can really help with your fundamental design.

Sciencer101
Member
Member
Posts: 14
Joined: September 5th, 2018, 6:58 am
State: -
Contact:

Re: Boomilever B/C

Postby Sciencer101 » December 6th, 2018, 5:32 pm

So do you guys think that rule 4.i. will actually be followed, especially at regionals? Specifically the second part, "Teams will be given a choice of which testing apparatus they will use," could potentially be helpful at regionals.
I imagine one tester being out of plumb, everybody wants to use the other one, but the officials say no, big hassle.
This is a bit unrealistic, I know, but I was curious to what you guys think. :D


- Sciencer

embokim
Member
Member
Posts: 108
Joined: October 24th, 2013, 3:17 am
Division: C
State: NY
Location: between weird and genius
Contact:

Re: Boomilever B/C

Postby embokim » December 9th, 2018, 7:56 am

Has anyone tried using dowels for tension members? Would they be inherently strong just because of the even and cylindrical design?

Thanks
in advance.
Happy to be here

Raleway
Exalted Member
Exalted Member
Posts: 190
Joined: March 12th, 2017, 7:19 pm
State: -
Contact:

Re: Boomilever B/C

Postby Raleway » December 9th, 2018, 2:53 pm

nambui0701 wrote:Hey guys :) I am a new member of SO and Boomilever event. May I ask if there is any mathematical / engineering approach to building the Boomilever instead of just blindly building and testing?

Much appreciate any answer.


I think balsaman would have loved to give the same exact answer like he did many times last and many seasons prior- run through old forums. All of the balsa events share the same design/physics/engineering concepts, just slightly modified based upon the design challenge. There are years worth of pages and information here ready to be dug up.

Side note: I will still be penning Len's name on my structures this year- I hope all those who have been helped by him will continue to do so. Wishing all the best to my fellow competitors and hope we can all learn from each other here!
Sleep is for the week; one only needs it once a week :!: :geek: :roll: :?: :idea:

God bless Len Joeris | Balsaman

User avatar
MadCow2357
Member
Member
Posts: 257
Joined: November 19th, 2017, 9:09 am
Division: B
State: RI
Location: Stark Industries Internship
Contact:

Re: Boomilever B/C

Postby MadCow2357 » December 9th, 2018, 3:00 pm

I will do the same thing, Raleway. Len Joeris was beacon for all of us who did Balsa events :cry: . I will never forget the impact he made on my life.
MadCow2357's Userpage
2019 Events: Battery Buggy, Boomilever, Fossils, Thermodynamics
"Son, if you really want something in this life, you have to work for it. Now quiet! They're about to announce the lottery numbers." - Homer Simpson
Rest in peace Balsa Man. You were a great man. :cry:

knightmoves
Member
Member
Posts: 54
Joined: April 26th, 2018, 6:40 pm
State: -
Contact:

Re: Boomilever B/C

Postby knightmoves » December 9th, 2018, 8:05 pm

embokim wrote:Has anyone tried using dowels for tension members? Would they be inherently strong just because of the even and cylindrical design?


Why do you think being round would help you in tension over some other shape? Also think about how you're going to attach your dowels to the rest of your boomilever - I think you might find that easier if you had flat surfaces to join.

knightmoves
Member
Member
Posts: 54
Joined: April 26th, 2018, 6:40 pm
State: -
Contact:

Re: Boomilever B/C

Postby knightmoves » December 9th, 2018, 8:13 pm

Sciencer101 wrote:So do you guys think that rule 4.i. will actually be followed, especially at regionals? Specifically the second part, "Teams will be given a choice of which testing apparatus they will use," could potentially be helpful at regionals.
I imagine one tester being out of plumb, everybody wants to use the other one, but the officials say no, big hassle.
This is a bit unrealistic, I know, but I was curious to what you guys think. :D


It would take a very large event to need two test stations on the go at once. You can schedule Boomilever tests every 7 minutes comfortably, so it's easy enough to accommodate 50 or 60 teams in a day. With two test stations and a joint B/C division regional, I'd use one test station for B and the other for C. So I don't see this rule coming in to play very often.

And you point out the problem with it - if an event does have two test stations, it's because it needs both stations in use to accommodate a large number of teams. In that case, having teams able to choose their test station might be problematic - if there's one obviously bad setup, everyone will choose the other and the scheduling breaks.

dholdgreve
Member
Member
Posts: 477
Joined: February 6th, 2006, 2:20 pm
Division: B
State: -
Contact:

Re: Boomilever B/C

Postby dholdgreve » December 11th, 2018, 1:19 pm

It looks like we will be running Boom Div B at the Centerville Ohio Invitational on January 12th. I'd think this will be possibly the single largest Invitational in the country this year, with 60 teams competing in both B and C Div... Ya... 120 teams in total!

We will be using (1) SDU (Sand Dispensing Unit ;) ) with 1 as a back-up in case of catastrophic failure of the first one (It is older than any Div C Competitors!). Although each team is allotted 6 minutes to test, the reality is that many will fail within 3 minutes. There are 10 slots per time period, 6 time periods, so that works out to an allowance of 5 minutes per team, including slack time between tests to weigh the loads, and explain the process to the next group... super tight, but "doable."

In past competitions we have offered teams the option of hand loading if they so choose, and roughly 10% choose to do so. Due to the extremely tight schedule at Centerville, we will only be testing with a loader to keep things on schedule so no one misses their next event.. I hope you guys understand.

Regarding the loader, a couple things to consider:
Start slow to settle the bucket, the gradually increase to WIDE OPEN over a period of 10 to 20 seconds. A structure like this will likely only carry the load for a finite amount of time. Best to get as much in as you can!
The loader we use comes equipped with a supervisor shut-off, so when the structure breaks, the supervisor can pull the release and the gate valve snaps shut. Their reaction time is probably pretty consistent, so theoretically, running it wide open will get a slight bit more sand in the hopper than if you were running it half speed.
Hang the buck high enough to not touch the floor if the bucket tips a little, but not so high that it touches the dispensing tube
The bucket tipping a bit DOES NOT create an imbalanced load... unless you are using more than one point of connection (i.e. 2 chains from opposite sides of the bucket.)
Using the stabilization sticks to push the bucket back and forth in an effort to disperse the sand evenly within the bucket DOES CREATE an imbalanced load. Don't do this!
Try to keep the load as static as you can. Do this by keeping the chain perfectly vertical. The more the bucket moves,the more dynamic the load becomes.
ALWAYS check the chain before you start loading to make sure there are no kinks in the links. If there are, they are likely to pull out when you start loading. This will cause the load to suddenly drop the length of chain link and in all likelihood cause the boom to go... well... you know... BOOM!
ALWAYS look at your boom from the distal end before you start loading, and check to see if your mounting is centered, your boom is vertical, your loading block is horizontal, and centered on your compression beams. Once you start loading you can no longer adjust it!
If one of you is going to stabilize the bucket, I highly recommend to SIT cross legged in front of the bucket, not kneeling or sitting on one cheek (you know what I mean!) This is the most comfortable for the long haul. In any other position you will likely need to shift around, pushing the bucket to one side or the other.
Keep in mind that when you are using the loader, and you choose to dispense very slowly, there is no catch-up. The loader, run wide open, will dispense 15 KG of sand in about 3 minutes. I've seen a number of kids realize too late that they misjudged their time, and with 30 seconds to go, open it wide open, but still run out of time without getting all the sand in the bucket. Far better to get all the sand dispensed in half the time, than half the sand in all the time.
Finally, if you do not understand the process or what is about to happen, please ask! We are here to help, and truly do want to see each and every team succeed. Sometimes we can tell by that look that you have a question, or don't understand, but some of you guys are really good at hiding your total confusion! If you ever are unsure, please ask for a clarification. We will be glad to take whatever time is needed.
Dan Holdgreve
Northmont Science Olympiad

Dedicated to the Memory of Len Joeris
"For the betterment of Science"


Return to “Boomilever B/C”

Who is online

Users browsing this forum: No registered users and 1 guest