嗨 大家好 这里是后院科学家
Hey guys, backyard scientist here and-
today we’re gonna be making a fidget spinner.
NO, wait. come back. come back.
It’s gonna be a BIG fidget spinner.
oh man, uhh, it’s gonna be made out of aluminum!
uh, and rockets!
Man, you guys had me worried for a second.
So thank you! I’ll also throw in a cat.
And a plasma cutter.
[noisy compressed air sound]
The first thing I did was
cut out the shape of spinner in a piece of plywood.
I’m using it as a template to cut the aluminum, using a plasma cutter.
I used a 2-inch hole saw to make the holes in the fidget spinner,
and that perfectly matches the outside dimension of the bearing.
I made supports to hold the bearing in place.
I used a 3-inch and 1 and 3/4-inch hole saw.
That should keep the bearing centered and keep it from falling out.
I’m using commercially available E-size rocket engines-
-and pipe strapping to hold it to the fidget spinner.
Okay, we got the fidget spinner all wired up.
I have sandbags to hold the base down,
Because even though i tried to make sure it’s super balanced,
It still might go a little crazy, and who knows what will happen.
So, this should hold it down.
Everything looks good to go.
Are you ready?
I don’t think that’s the best spot.
Maybe hide behind your car. I don’t know why you…
I don’t know why she parked her car so close. [hmm..] huh
[loud rocket propulsion sound]
[sound of metal clash and clank]
oh, I forgot to trigger it!
好吧 各位 我一定是完全疯了
Alright, guys. I was totally nuts.
Like, there was so much stuff happening at the same time,
I couldn’t even really tell what was happening.
So, I have to go back and rewatch the footage. And-
-Well, Let’s have a quick recap.
First of all, you’ll notice there’s only two rockets left on the fidget spinner.
The first rocket broke free and made a beeline right towards my car.
It hit the wheel and then started to pingpong-ing around on the inside of the wheel well.
And it’s pretty ironic,
because I was giving Sandra a hard time about parking so close to the rocket setup.
The next rocket works fine.
And it was actually the only rocket that was powering it.
Because the third rocket exploded instantly as soon as I lit it.
and unfortunately it was pointed at Sandra, and
it shot like a piece of gunpowder right through the plastic table,
and it ended up under her ankle and she was sitting cross legged, so
She’s totally fine, she just doesn’t want to play with the rockets any more,
and I totally understand that. I mean,
迄今为止 风火轮得两分 后院科学家得零分
so far it’s fidget spinner 2, backyard scientist ZERO.
Because that’s burned Sandra, it burned me …
the thing is a death trap.
Let’s put some more rockets and try again.
好啦 各位 我要开始啦 在此之前
Alright guys, here I go, before I go-
-I want you to comment how long you think it will spin for, alright?
好啦 开始 3 2 1
Alright here we go… 3, 2, 1.
[loud rocket propulsion sounds]
[sounds of metal clash and clank, and noise]
I was filming at 1500 FPS and I counted 17 frames per revolution.
That means it was going around 88 times per second or 5,294 times per minute.
好了 到时候见分晓 看看谁答对了
Alright, I’ll see you that time and I’ll see who got that right.
I’m just so happy that this paid off in the end.
You know, I think I know what one of the problems was.
This thing was spinning around so fast,
the gun powder in it was being like forced out the back or something.
You can tell that-
-on the high speed camera you just see these random showers of sparks shooting out of the thing.
And I think that was
you know, a structural failure inside of the rocket engine.
That’s probably what all these holes are,
On the side of the rocket engine like this.
When it was spinning around, the gunpowder-
the burning gunpowder was being pressed up against the wall, and…
eventually flung out.
I think that that’s probably…uhh…
nothing that I can do any better. That’ll just…
that’s the results that we got.
I’d like to give a shout out to Stephen Sharer.
He’s the one that gave me the idea for the video.
He originally tried it on his channel and…
he had his own set of difficulties you know…
just like I did but… you know.
He’s got a pretty cool channel,
a lot of fidget spinner, a lot of nerf stuff.
I met him at Playlist Live,
he’s a super cool guy, so.
I’ll see you guys next video.
[birds chirping, rushing air]
嗨 大家好 这里是后院科学家