>> ♪ We've got two days to get this straight ♪ We got a challenge just won't wait our eyes are on the prize ♪ An engineer just set the date ♪ We got this client can't be late oh, no, it's go time ♪ Build it, test, fix it debug now and kick it ♪ Got to get it off the ground yeah ♪ Stick around and you'll see what teamwork's supposed to mean ♪ It's so key Design Squad Design Squad!

♪ >> Game on!

Watch the shins.

Purple Team scores!

Game on.

Green Team scores!

One more.

Back in.

>> Car!

>> All right, Design Squads, we've got a break in the action.

Bring it in.

Come on.

Wait until you see what today's client wants you to do.

>> Oh, my goodness.

>> That's the Bruins.

>> Hi, I'm Matt Lashoff from the Boston Bruins.

To play in the NHL today you need to be able to skate, pass, and especially shoot.

You need to have quick reflexes and be very accurate.

Here's where you come in, Design Squads.

I need you to build me a target for shooting practice.

But here's the catch-- it needs to be a moving target, it needs to be easily attached to a hockey net, and it needs to be durable.

Because pucks nowadays can travel over 100 miles an hour.

I'll test both targets at practice.

Good luck, Design Squads.

Don't blow it.

>> You guys get all that?

>> Yeah.

>> You're building a target for the Bruins to shoot at.

Now, it's got to be durable, because the pucks are going to be going at it at 100 miles per hour.

And it has to be easy to attach and detach from the net.

Any questions?

Start brainstorming.

>> They're pistons that can attach to our shock air system.

>> Engines.

>> I don't know what half this stuff is.

>> Have you seen a hockey game before?

>> Yes.

>> Yeah.

>> Where are, like, the key areas that the players, like, aim for?

>> Probably the corners.

>> You know what I was thinking?

Like, something that would just keep rotating around, like, the whole area.

>> So the bullseye would just be on, like, a track, and it would just sort of go around.

It would be great if we had, you know, something where you've got your goal, and you've got one track that sort of goes like that, and another one that goes like that, and you've got your target there, so as it moves across it can also be moving up and down.

But, I mean, that means that as soon as it hits here, it's got to go back the other direction, and as soon as it's here it's got to go back the other direction.

Same with here and here.

And that's a lot of switches, and a lot of wiring.

>> Yeah.

>> And there's a lot of places for that to go wrong.

>> So if this is the net... >> Very artistic.

>> Thank you.

>> It doesn't look like a... it looks like a... >> Do you want my design?

Then we have, like two wheels, and then we have the duck.

Everyone likes to shoot the duck.

And this can just keep on going up and down.

>> Let's recap.

As of now, we have our pulleys with our steel cable... >> Allow me to interrupt and ask what you're doing.

>> Well, we were just talking about that, actually.

>> The basic idea is to have a pulley system run by a motor.

And one of the arms is attached to here so it moves across and up and down at the same time.

And there is a target attached to it that is shaped like a duck.

>> Like a shooting gallery duck.

>> Cool.

So you've got an idea already that you've completely honed in on, and you are now making a two-axis moving target.

>> You think we should brainstorm a couple more ideas before we hone in?

>> I do.

>> Can we do multiple targets?

>> Yeah, yeah.

I like that.

Think about what he's trying to accomplish when he's training.

He wants to get the puck in the net.

The goalie's jumping back and forth, and these spaces are opening up above and below and to the side really quickly.

So they're not interested in some kind of thing that's going to be slowly moving around, right?

>> Yeah, because with the track they know where it's going.

>> You want accuracy with quick reactions.

That's exactly what hockey's about.

>> So our target for the target is the four corners.

>> Hey, Nate.

>> How's it going?

>> Not bad.

>> So what are you guys brainstorming?

I see a target, a bullseye that's moving around the outside.

>> Yeah.

>> Deysi's idea.

>> What other ideas have you had?

>> The only other thing I thought is we have a track up there and a track down there that's going side to side and up and down.

>> Hockey players are going to be shooting at it every couple of seconds, if not faster.

So if you've got a moving target, you want it to move quickly.

In both of these I take it you're talking about a moving target that you're shooting at.

Flip it around.

Make it a hole.

Think about multiple targets, right?

When the goalie's standing there he's got multiple spots in the net above and below him, to his left and right, that are opening up and closing at all times.

So you don't have to have something that's moving physically around the net.

Any other questions?

All right.

Let's do it.

Game on.

>> So instead of hitting at a target, give them an area that they have to shoot through?

And we have, like, the piston- type things.

Pistons work real fast.

That's the one thing that's great about them, is they can get something out really quick and retract it really fast.

>> Dewey wants to use double- acting pneumatic cylinders to open and close their target doors.

Here's how they work.

When high pressure air enters through a port into the cylinder, the air pushes on the piston, extending the piston rod, or actuator.

Air entering through a second port pushes the piston from the opposite side, retracting the piston rod.

>> You can just have this guy covering that hole right there, and then as it comes back in, it pulls the door open, and now they shoot for it.

And then it closes as soon as they... after a certain amount of time.

And then another one opens.

You can open two at once, stuff like that.

So this hunk of wood will help represent a door.

>> We have a covering that goes over the net, and then have, like, trap doors.

I don't know where that hinge is going to be.

>> Yeah, I was thinking the same way.

So at most we're going to have three flaps opening at once, right?

>> Yeah.

>> Now, if all the flaps are connected by a rod, all we would need would be... here's a block with the pneumatic arm onto it.

So the pneumatic arm just flips it up.

>> Just like Purple Team, Green Team wants to use pneumatic cylinders to power their doors.

But here's the difference.

Purple Team's design has a traditional target layout with doors at the four corners and between the goalie's legs.

And their puck door openings are large.

Green Team's design has columns of smaller doors that open together so the hockey player can decide whether to shoot low, high, or in the middle.

>> Hey, you guys.

Nice.

Is that heavy?

>> Can I get inside and trace?

All right.

>> I feel like we should just clamp this in place and leave her.

>> I've got a whole stack of plates so we can lay them out.

And we just put it on the table and start cutting.

>> How's it going over there, Leah?

>> Good.

I'm going to try and work out how to make the pistons be operated by switches.

The way we're going to control when it opens and closes is through these solenoid valves.

>> A solenoid is an electric coil.

When a battery is connected to the coil, a magnetic field is created and pulls a plunger or armature back.

This opens a valve, allowing high pressure air to flow into the pneumatic cylinder.

When the battery is disconnected, the plunger is pushed back, closing the valve, and blocking the flow of high pressure air, while letting air flow out of the cylinder.

Purple Team will need to use two solenoid valves for each pneumatic cylinder.

One solenoid valve will be used to extend the piston rod, and another will be used to retract it.

A programmable timer will be used to automatically switch the valves on and off.

>> And that way we can hook the solenoid valve to a timer so there's, like, a different configuration of trap doors opening at different times, so the hockey player never knows where exactly he's going to have to shoot to.

>> This button right here is going to extend our actuator, and then this button over here is going to retract the actuator.

>> Do you want to test it?

>> Yeah, go for it.

>> Okay.

>> Hey, guys, you want to bring your door over here to try it?

>> Good job.

>> Retract.

>> Whoa.

>> Whoa, there.

>> It's kind of funny.

You're just playing with me now, aren't you?

>> Don't get your hands near.

I cannot stress that enough.

>> Oh, there we go.

>> There we go.

>> Hey, guys, do you want to see a test?

>> Yes.

>> Well, good work so far.

>> So Nick and I made a mockup of what our flaps are going to be working like.

>> Oh, great.

>> So Nick, do you want to test it out?

>> I'd love to.

>> And show Leah her victory and triumph?

>> Yeah, I'm really excited.

>> So it will pull the arm forward and lift up.

>> Nice.

That looks really good.

>> Crazy, isn't it?

>> Add that looks also pretty simple.

>> Do that again.

What kind of metal are you using for the flaps?

>> Steel, probably, so we can weld it.

>> We need people cutting and welding.

So who wants to do what?

>> I'll weld.

>> Great.

Nick is welding.

I'll cut these pieces.

>> And this, right?

>> Do you want to take care of that, Tomas?

>> Oh, sure.

>> All right.

Are we ready to rock and roll?

>> Yeah.

>> All right, let's do it.

>> What you're going to do is you're going to weld it like this, okay?

>> Cool.

>> In my country we don't really play hockey.

We usually play other sports like soccer and others, like basketball, volleyball.

Hockey, I think it's an American thing and a Canadian thing.

I will get on a pair of skates for my first time in my life.

That should be interesting.

>> Tomas!

>> What?

>> Take a break.

You don't know what you're doing.

>> Why would you say such a bad thing, man?

>> Because the position of the holes is really critical to our whole project.

So we have to lay out everything before we can get the position.

>> Before you start drilling.

>> All right.

>> This is one of the steel flaps that is going to basically act as a trap door for our holes.

>> I have to be really precise, otherwise Nick will do something crazy.

No eyeballing for this one.

>> This thing's a monster.

But it'll stand up to 100-mile- an-hour hockey pucks.

>> Got to go here, here, there, there, and right there.

>> Are you sure you guys want to make the holes that small?

>> That's why they're professionals.

>> Today was a good day.

We got our mockup done.

We're ready to build tomorrow.

Am I right?

>> Yeah.

>> Yeah.

>> All right.

Yep.

>> Nice job.

>> Game off, Design Squads.

That's the end of day one.

>> Uh, guys... >> Day two.

>> All right, what do we need to do?

>> Build the doors.

And the rest of the device, for that matter.

>> We have our first door right here.

>> We need to mount two hinges on here so this thing can pivot.

>> The most recent modification was the decision to make the fifth hole that's right in the bottom, the center, we just have to make that a little larger.

It was a little small.

There's really no way they're going to be able to hit that hole, realistically.

So we decided to enlarge that, and that'll make it a little easier for us to work with, one, and two, for someone to actually hit it.

>> I'm going to weld the bracket for the bar that's going to flip open the flaps.

I'm going to put a tack weld on each side, just so it stays in place.

>> You finished?

>> Yeah.

>> Cool.

>> Hey, that looks good.

>> Nick's finished welding the piece, and I'm trying to figure out how we're going to weld the pneumatic arm to the rod.

This pneumatic arm is going to open these doors over here, one, two, three.

>> We could just mount this piece right here.

>> You saved our day, my friend.

>> Thank you.

>> Let me mount the piston here, and we're ready to go.

>> This is the...

I've got to move.

Oh, it's working now.

For some reason it's working.

>> It takes a lot to break polycarbonate.

>> If they shoot at the door and the door closes before they can get it through, and we don't want to, like, crack that thing open... >> So we have to cut a piece of polycarbonate that's that big.

>> Yep.

>> It works.

At least it goes quickly.

>> Do you guys want to test it in the net?

>> Sure.

>> Oh, man.

Oh, good.

So this goes here.

Okay, that's it.

>> Perfect.

There we go.

Rather alarming.

It's like this medieval torture device.

>> Game on!

Ready to test?

>> Yeah.

>> All right.

>> Those are really tiny.

>> It'll make you better.

>> Is it fun?

>> Oh, yeah, it's fun.

So how are you guys going to attach it to the net?

>> We have the U-bolts that we were talking about, right?

>> Yeah.

>> Think about ways that are easy.

Because in my opinion, U-bolts, I mean, they'll hold it really securely, but they're not that easy to use.

You've got to stick it through a couple of holes and then reach around something to try and screw the nuts on.

>> Maybe just a hook on the top that comes around.

>> Now we're talking.

That's a little bit simpler.

And then maybe something at the bottom to hold it securely.

All right, Leah, I'll leave you to figure out how to get out of there with people keeping you trapped.

>> You'll stay there for the rest of your life.

>> Oh!

>> No, I'm just playing.

>> Guys, this one works perfectly.

>> These two actuators are very close to each other, but they should be out of each other's way.

But then again, crossing your fingers and praying to God doesn't hurt.

>> Careful.

>> Go on home, Deysi.

>> We may have to shave that off.

>> It's so close to the edge.

>> It's the polycarb.

There's a little piece of it sticking up.

>> This one we need to shave down some more.

>> Does the bottom one open right?

>> Yeah.

>> Oh!

>> Kim and I are just cutting off our piece of polycarbonate to make a covering for the front of our contraption.

It'll stop the wood from getting splintered or crunched.

>> It's actually the way they make the sides of the hockey rink.

>> You guys know what time it is?

>> We have, like, 20 minutes, maybe.

>> Trying to stay in the lead.

Leah's right behind me, so if their team pulls this off, the two of us will be neck and neck and we head into the final stretch here.

If I can take this and stay in the lead I'll feel a lot better about my chances overall.

I think that's finally starting to get to me.

>> Is this supposed to be attached in here?

>> Watch your hand.

>> All right, Purple Team.

Let's see how this thing works.

I want to see that top one open.

Not that I can hit it.

>> Some of the doors get stuck and won't open inward.

>> Are you going to fix the jams before you're done?

>> Yeah.

We have a few more finishing touches we have to do on the entire thing.

>> Who's going to fall down first?

>> Don't open your legs!

Close them.

>> Nate told me he'd teach me.

He left me stranded.

>> Help me!

I'm sorry.

Thank you for holding me.

I think I can make the Albanian national hockey team.

>> If I win, then I'm tied with Dewey.

>> Oh, wow.

>> There's only one more challenge left.

And I realized I had so much adrenaline running through me, because I know that this is, like, really critical.

Really critical.

>> Watch out!

>> Get you guys next time.

>> If I win this one, that means that Jason and Leah are tied, so I think I'd probably... between the two of them I think I'll have a better chance if I was facing off against Jason.

>> Game on.

>> Yeah, game on.

>> I'm watching you.

>> Here he comes.

>> Sorry to break it to you, Nate, but I think he's better looking than you.

>> Come on, guys.

It's the challenge.

Come on.

>> What's up, Matt?

>> What's going on?

>> Design Squads, this is your client, Matt, from the Boston Bruins.

>> Hi.

>> Hi, guys.

>> Matt, ready for some shooting practice?

>> I am.

>> The Purple Team's target has five doors.

They represent the five typical openings around the goalie.

So it's kind of like a moving target, but you shoot into whichever is open.

>> Sounds good.

>> Oh, nice.

That was awesome.

>> Better than Nate.

Better than Nate.

>> Well, it's definitely better than what's at the NHL All Star Game Skills Competition for sure, because you never know what's coming next.

>> So Green Team did a sort of similar contraption to what Purple Team did in that we have numerous trap doors opening through a system of pneumatic pistons all at a random time scale.

One thing that we did differently, though, was that we made lots more doors, and we made them slightly smaller.

>> Sounds good.

Let's see what we can do here.

>> Hey!

It went in, it went in, it went in.

>> What did you think, Matt?

>> I think this is good, too.

I mean, you guys got a lot of differences and similarities in both of them.

So, I mean, the main thing here is these are a lot smaller, so it makes you kind of try to focus a little bit more on it.

And they're moving quick, too, so... >> All right, Matt, you ready to huddle up and decide the winner?

>> Let's do it.

>> Design Squads, on the bench.

So between the two, which one's going to help you out the most as a player?

>> You know, it's going to be a tough decision all the way down to it.

The Purple one, I like how you don't know which one's coming.

The holes are bigger.

You can kind of hit it off the post and in, like you could in the game.

Green, though, I think might have a little bit of the edge, just because they're smaller, it's quicker, you have to be a lot more accurate.

>> All right.

So I guess we'll go tell the kids.

>> Let's do it.

>> Here he comes.

>> This really wasn't an easy decision.

The Purple Team did an unbelievable job.

The Green Team, the squares were a little bit smaller, they moved a little bit quicker.

>> So now, the winner of the Tiger Practice Challenge is... >> The Green Team.

>> Finals.

>> Honestly I can say that I do feel a little ripped off.

I did think our goal system was better than the Green Team's, mainly because I was part of building it.

>> Now, if you have a choice to go and help either Leah or Dewey win, whose team would you like to be on?

>> Oh, Dewey's extremely smart.

I mean, he has just as much of a shot as Leah does.

But personally I would root for Leah.

I really thought that I had a shot of getting at least second place.

It just wasn't meant to be.

So I'll take my time and lick my wounds, I guess.

>> And that means it's Dewey versus Leah in a face-off for the college scholarship.

>> Hey, have you checked our Web site?

>> Yeah, it's pretty cool.

You can build projects on your own or with your friends, and you can win cool stuff.

>> Oh, check it out.

Go to pbskidgo.org.

>> Next time on Design Squad... >> Oh, nice.

>> Start your engines!

>> This is awesome.

This thing is going to rock on race day.