Bungee Drop C

iwonder
Admin Emeritus
Admin Emeritus
Posts: 1106
Joined: May 10th, 2011, 8:25 pm
Division: Grad
State: TX

Re: Bungee Drop C

Postby iwonder » November 1st, 2013, 7:13 pm

I'm planning on holding the bungee at different lengths in order to change how far it goes. It seems like this is the intent since the rules refer to marking lengths on the cord, I believe.
'If you're the smartest person in the room, you're in the wrong room' - Unknown

mwloveslm
Member
Member
Posts: 60
Joined: October 30th, 2012, 6:31 pm
Division: C
State: CA
Location: MLHS from WCMS

Re: Bungee Drop C

Postby mwloveslm » November 2nd, 2013, 5:42 pm

Can anyone post a picture of the testing device?
Livin' the Cali Lyfe (:
CHURCHILL MS
Build Events <3 <3

User avatar
The Architect
Member
Member
Posts: 42
Joined: February 15th, 2011, 3:03 pm
Division: C
State: VT

Re: Bungee Drop C

Postby The Architect » November 3rd, 2013, 7:15 am

What are people interpreting a "Self-limiting-brake" to be? Would this consider things such as parachutes to be brakes?
Science, yeah!

Made a new team. 7th place at NH states. Officially the champions of Vermont.

2015-2016 Events:
Air Trajectory, It's About Time, EXPD, and WIDI.

asdfqwerzzz2
Member
Member
Posts: 35
Joined: June 12th, 2013, 7:57 pm
Division: C
State: -

Re: Bungee Drop C

Postby asdfqwerzzz2 » November 3rd, 2013, 7:26 am

The Architect wrote:What are people interpreting a "Self-limiting-brake" to be? Would this consider things such as parachutes to be brakes?


I believe it's saying that the elastic has to brake itself and go back to its original position by itself. This would include parachutes.

number_cruncher
Member
Member
Posts: 28
Joined: April 15th, 2012, 8:59 am
Division: C
State: MO

Re: Bungee Drop C

Postby number_cruncher » November 4th, 2013, 10:18 am

Non-elastic Tethers would be another self-limiting brake. I imagine sheaths that cover the elastic would also be considered a brake.

number_cruncher
Member
Member
Posts: 28
Joined: April 15th, 2012, 8:59 am
Division: C
State: MO

Re: Bungee Drop C

Postby number_cruncher » November 4th, 2013, 10:20 am

mwloveslm wrote:Can anyone post a picture of the testing device?



For our invitational, I am using a 3/4" dowel rod with a spring-loaded clothes pin zip-tied to the end. The dowel will secure the bungee, and the clothes pin is used to release the mass. Had to drill a hole in the end of the dowel to accomodate the zip tie. Then used electrical tape to keep the zip tie from interfering with the bungee.

It is portable; the dowel rod can be zip tied or taped to the desired height from the surface plane for testing different heights as well.

asdfqwerzzz2
Member
Member
Posts: 35
Joined: June 12th, 2013, 7:57 pm
Division: C
State: -

Re: Bungee Drop C

Postby asdfqwerzzz2 » November 4th, 2013, 4:49 pm

number_cruncher wrote:
mwloveslm wrote:Can anyone post a picture of the testing device?



For our invitational, I am using a 3/4" dowel rod with a spring-loaded clothes pin zip-tied to the end. The dowel will secure the bungee, and the clothes pin is used to release the mass. Had to drill a hole in the end of the dowel to accomodate the zip tie. Then used electrical tape to keep the zip tie from interfering with the bungee.

It is portable; the dowel rod can be zip tied or taped to the desired height from the surface plane for testing different heights as well.

Is it possible to post a picture of this?

Mathc314
Member
Member
Posts: 17
Joined: March 18th, 2012, 4:15 pm
Division: C
State: -
Location: Someplace in the USA

Re: Bungee Drop C

Postby Mathc314 » November 7th, 2013, 12:45 pm

Is this device the means by which you are testing this to model the actual tournament scenario or is this a permanent attachment to your bungee cord?
"The philosophy of the school room in one generation will be the philosophy of government in the next." -Abe Lincoln

Mathc314
Member
Member
Posts: 17
Joined: March 18th, 2012, 4:15 pm
Division: C
State: -
Location: Someplace in the USA

Re: Bungee Drop C

Postby Mathc314 » November 7th, 2013, 4:30 pm

If possible, a picture would help clarify what you mean. Thanks!!!
"The philosophy of the school room in one generation will be the philosophy of government in the next." -Abe Lincoln

Cougars
Member
Member
Posts: 8
Joined: October 29th, 2013, 6:13 pm
Division: C
State: MN

Re: Bungee Drop C

Postby Cougars » November 7th, 2013, 5:20 pm

Rule 2b states: "Supervisors will supply a drop mass (50-300 grams) that will be placed in a 500-591 ml plastic bottle..."
So am I to understand that a mass of 50 - 300 g (25 g increments for regionals) will be placed in the bottle and the total mass will be the "added mass", plus the bottle and any carabiner/clasp used?
With 50 g of mass in our bottle, the whole mass was about 87g. So when we get to the competition, although we can measure the mass before we drop it, we can 't actually prepare for a given mass, as the mass of the bottle/carabiner will be different depending on what the event judge brings?
Last edited by Cougars on November 10th, 2013, 4:21 pm, edited 1 time in total.

wlsguy
Member
Member
Posts: 366
Joined: March 23rd, 2009, 9:08 am
Division: Grad
State: OH
Location: Ohio

Re: Bungee Drop C

Postby wlsguy » November 8th, 2013, 4:00 am

Cougars wrote:Rule 2b states: "Supervisors will supply a drop mass (50-300 grams) that will be placed in a 500-591 ml plastic bottle..."
So am I to understand that a mass of 50 - 300 g (25 g increments for regionals) will be placed in the bottle and the total mass will be the "added mass", plus the bottle and any carabiner/clasp used?
With 50 g of mass in our bottle, the whole mass was about 87g. So when we get to the competition, although we can measure the mass before we drop it, we can 't actually prepare or a given mass, as the mass of the bottle/carabiner will be different depending on what the event judge brings?


I agree with your interpretation that the drop mass is not the total mass of the bottle + attachment.
It looks like the writers tried to make it easier by specifying the drop mass will be in 25g increments for regionals and 10g for states but this was made effectively useless when the unknown variable of the bottle and attachment method was added. The last line specifies the total mass including attachment mechanism will be posted after impound.

If I were you I would submit a clarification.

Maybe the rules writers will realize the (possibly unintended) difficulty with having the attachment variable and change the wording such that the total mass will be between 50 ~300g and will be in in 25g increments for regionals and 10g for states. Since I would expect most supervisors to use a plastic bag full of sand for the drop mass amount, it can easily be changed to compensate for any attachment and get a nice even number for regionals and state.

number_cruncher
Member
Member
Posts: 28
Joined: April 15th, 2012, 8:59 am
Division: C
State: MO

Re: Bungee Drop C

Postby number_cruncher » November 8th, 2013, 11:01 am

Mathc314 wrote:If possible, a picture would help clarify what you mean. Thanks!!!


I apologize - I'm not ignoring your request, but can't get the image to upload.


The dowel rod & clothes pin is simply what I'm using as an event supervisor. What other event supervisors use could vary.

Also, in addressing the mass added to the bottle, I am picking a mass between 50-300 grams + 38 grams for the 591 ml bottle & attachment carabiner. I will post the mass this way

Example
200g mass

38g bottle & attachment

238g total mass

I am also going to "assume" any height between 2 and 5 meters, since the rules do not specify exact increments.

Cougars
Member
Member
Posts: 8
Joined: October 29th, 2013, 6:13 pm
Division: C
State: MN

Re: Bungee Drop C

Postby Cougars » November 10th, 2013, 4:39 pm

I submitted the question about the mass if it includes the bottle and attachments or not. I don't think it does and hence it makes this event that much harder!

number_cruncher
Member
Member
Posts: 28
Joined: April 15th, 2012, 8:59 am
Division: C
State: MO

Re: Bungee Drop C

Postby number_cruncher » November 11th, 2013, 7:07 am

We ran bungee drop this past Saturday for an invitational with excellent results. The mass was announced at 300 g with 38g for the bottle and attachment. No team had any problems with this.

One issue that did come up is in regards to teams bringing their own bottle & attachment. We did not allow the teams to use their own bottles, and all teams were able to use the provided bottle (coke zero bottle with BB's and the lid had an eye bolt & carabiner).

The release mechanism & dowel rod posed few problems. Duct tape was provided if teams needed to use it. Since the rules do not make any specifications for the release mechanism & attachment, our judges chose to be permissive. Also, in the case of the key ring attachment, the rules use the word "approximate" so we did too. 1" key rings are actually 1 1/4" across with the heavy gauge metal.

We used a plasic shoe box filled with foam padding as the surface plane - the top was covered in a single layer of tissue paper, and held in place with a rubber band. It worked perfectly.

We had 5 in Tier 1 (in specs with no touches), 3 in Tier 2 (in specs with 1 touch), 2 in Tier 3 (in specs with 2 touches), 2 in Tier 4 (no impound - no touches) and 1 in Tier 5 (no impound 1 touch).

I highly recommend using the "Coach's View" app on IPad for judging. This gave us precise measurements. Video the drop, then view the results frame by frame with a measuring device in view behind the drop area. There was no disputing the results!

mwloveslm
Member
Member
Posts: 60
Joined: October 30th, 2012, 6:31 pm
Division: C
State: CA
Location: MLHS from WCMS

Re: Bungee Drop C

Postby mwloveslm » November 13th, 2013, 6:54 pm

These might seem a little stupid, but i have a few questions. About how tall approx. are your guys' bungees? like from bottom to top when fully stretched and not stretched? (so i get a general idea about how to make mine).....also, for the "top end", what are you guys using? We have to provide our own, right? I think i got confused because i think it was written somewhere that the judges provided the attachment for the top block....if we dont have to provide our own, then how will the judges determine what to use that can accomodate everyone's bungee?
Livin' the Cali Lyfe (:
CHURCHILL MS
Build Events <3 <3


Return to “2014 Build Events”

Who is online

Users browsing this forum: No registered users and 1 guest