 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is the Straw Propeller Air Motor. As always, adult supervision is required. What you need for this experiment is two straws, tape, a ruler, scissors, and adult supervision. To set up this experiment you need two straws. One I cut at a four inch length and so once you get that you're gonna fold it in half which if I have to do the simple math for you that's two inches. Once you get that folded in half there you're going to just cut off the corners of each one just like this so get a pair of scissors and just cut a little nick each. You see the blue lines there I kind of just want writes the blue lines a little bit more on this corner here and then you're set you open it up and you can see you have a hole in the straw right there kind of a little diamond shape. Once you get that done then you're gonna take a couple pieces of tape. I took blue electrical tape it could be any kind of tape and you're gonna pinch down the end and put the tape over the ends and hold it pinch down so the air can't get out and seal that tightly. It doesn't matter if it goes over the extra to the side because we will trim that. Then do the same thing on the other end where you take the tape push down very hard so it's squeezed and now we're going to cut off the excess tape on the straw. You don't want to cut the straw itself yet you just want to get the tape itself cut off so just go ahead and trim that tape off there and once you get all four corners of the tape trimmed then we are going to a little little problems there there we go make sure the tapes secure and then we're gonna cut off two different ends here of the straw so we'll take the end of the straw here and just cut a tad off we just want a little bit of the hole opening just like this doesn't have to be a large just enough for the air to get out then we're gonna do the opposite end to the bottom down here where we do the top and the other one same cut so now we got to cut a little hole on each side but opposite ends so one's facing up and one's facing down that piece is done now we're going to take a second straw but we're not cutting in half we just want to cut a little dentation out of it about inch and a half down off this we're just trying to cut a little groove out of the straw here so the other straw can rest into that little niche there so about halfway down a little just the same size of the straw and then you're gonna take the other straw and slide it in see how it fits right like that so you might have to go back and cut it a little bit but you want the other straw to fit right into that niche right there now we're gonna do the same thing we do on the sides we're gonna put tape on the top piece so we're gonna go ahead take a piece of tape and pinch down on the straw and fold it back over the top and press down so it seals it off and then we're gonna cut off the excess tape there on the straw so it just flush with the straw right there this time we are not not going to cut anything out you can see it spins around but it's a little little tight what I did here is I added a little blue line so you can see the propeller spinning around you can use different colors it'll kind of give it a nice little effect so and here's a side look on it so when you put your mouth on it and you blow here I'm just playing around with this showing it it does spin not very good now when you blow on it you have an air propeller right air propeller engine right there so it's blown away the faster you blow the faster propeller goes so this is a real easy and fun experiment to set up and the kids really love doing it especially if you start doing a little bit of design on your propeller like I have blue you get really tricky and start doing a lot of different colors on there I hope you enjoyed this video remember to click thumbs up and to subscribe as we do a new video every day thanks for watching