Scrambler B

[Ppika]

First time doing scrambler this year. Need help on release mechanism. I am using pulley launcher with two pulleys(left and right) on the top of the launcher and two on the front. How do you connect the strings to ETV? How does the string push the ETV and releases it.
Another problem is how to use the eyebolt release mechanism for the weight?

[bernard]

First time doing scrambler this year. Need help on release mechanism. I am using pulley launcher with two pulleys(left and right) on the top of the launcher and two on the front. How do you connect the strings to ETV? How does the string push the ETV and releases it.
Another problem is how to use the eyebolt release mechanism for the weight?

I'd imagine if you do it like most teams, you'd have your line pulled, so the ETV would be pulled forward. You can attach the strings to your ETV at the back on hooks/sticks. You'd probably want the connection as far back as possible so it can experience the pull force as long as possible. You'd want the string not to lift up your vehicle at any point because that would cause it to jerk and jump. So you'd probably want your string to be level with the ground.

I'm multitasking too much now to answer your second question but I've got an answer to it with possibly photos.

[Ppika]

Thank you so much! Will hooks work? Do they come off easily? I used L bracket attached to the back of the Etv. But it keeps falling off.

Diagrams would definitely help. We are thinking of using eye bolt for the release mechanism but don't know how it would work.

[InfiniCuber]

Thank you so much! Will hooks work? Do they come off easily? I used L bracket attached to the back of the Etv. But it keeps falling off.

Diagrams would definitely help. We are thinking of using eye bolt for the release mechanism but don't know how it would work.

I used eye hooks on my launchers in place of pulleys in general on my launcher last year.

An L bracket seems rather heavy, doesn't it? use a dowel rod inserted into your car, hot glue it, drill a hole for it, whatever. It should hold and be fine:)

For your release mechanism, I HIGHLY recommend that you look into archery triggers. Go to your local sports or outdoor supply store and ask for them. Find the cheaper ones, they will do just fine. All you have to do is attach it to the launcher and make a loop on your string to go on the trigger, and BAM! Perfect launch mechanism.They should look like this (I used this style for mine) or this (Other people on my team used this and it works just as well, you just have to take everything else off except the trigger itself. Hope this helps a bit!

[bernard]

Thank you so much! Will hooks work? Do they come off easily? I used L bracket attached to the back of the Etv. But it keeps falling off.

Diagrams would definitely help. We are thinking of using eye bolt for the release mechanism but don't know how it would work.

I used eye hooks on my launchers in place of pulleys in general on my launcher last year.

An L bracket seems rather heavy, doesn't it? use a dowel rod inserted into your car, hot glue it, drill a hole for it, whatever. It should hold and be fine:)

For your release mechanism, I HIGHLY recommend that you look into archery triggers. Go to your local sports or outdoor supply store and ask for them. Find the cheaper ones, they will do just fine. All you have to do is attach it to the launcher and make a loop on your string to go on the trigger, and BAM! Perfect launch mechanism.They should look like this (I used this style for mine) or this (Other people on my team used this and it works just as well, you just have to take everything else off except the trigger itself. Hope this helps a bit!

FYI--I'm just remembering that some things InfiniCuber and I say about design will match--that's because we approached the event in a similar way last season. If you've got the Scrambler CD from the Science Olympiad Store, it looks like the device of Solon Middle School.

[Ppika]

Thank you Bernard and infinicuber! I tried cotton pin to release the mass yesterday. I had to remove the cotton pin with the pencil. Does anyone know it is allowed to take off anything from the device? If it doesn't work I am going to the store to look for archery triggers.

[InfiniCuber]

Thank you Bernard and infinicuber! I tried cotton pin to release the mass yesterday. I had to remove the cotton pin with the pencil. Does anyone know it is allowed to take off anything from the device? If it doesn't work I am going to the store to look for archery triggers.

What do you mean by take off anything? During competition, during a run? and the device being the launcher or the car? If you are worried that the cotton pin will touch the ground, attach a piece of string to one end and tie or glue the other end of the string to somewhere nearby so it doesn't fall off the launcher!

[Ppika]

Thank you infinicuber. I already tried it and it is working fine.

[dragonfruit35]

Oh! Do you mean removing the cotton pin completely from the device? You should probably build a ledge directly under it to catch it- I'm not sure they'd allow you to take off the pin so that it was no longer touching the device.

[seadog]

Hi guys,

In the push rod launcher model, where there is the arm that pushes the vehicle and does not touch the ground at the end, does the arm along with the masses be impounded so that they can be measured for the total mass. Meaning, the arm needs to be detached from the device at impound?

If the answer is yes, that the arm also needs to be detached at impound, has any one been able to build this kind successfully? Which is the easiest type to build among all of the options?

Your help is highly appreciated! Thanks!