hey dude , there is a new throw. Have you tried it ? Not yet, how does it play? More stable than xxx.(usually a yoyo come out not long before that) or fantastic feeling(about finish or shape) or great for speed with a so reasonable price.
I am bored with this. Because every time I try , I got disappointed. Nothing greatly has changed, still about 1 min effective spin time, still the H shape that like yoyorecreation, even worse people in my country became silver addicted… I am not rich since I am being a student, but if there is a throw really works, I would try my best to get it. So what is a revolutionary change for a yoyo? Like Tom Kuhn use ball bearing, Hspin made H-shape ,kind of this change really works.
You can’t define any yo that change as I mentioned before. You may say a clyw chief is amazing throw, but not epic, in fact it may be inferior to Sleipnir a throw originally made in 2008. Although we need to consider factor like price or appearance, but too many yoyos with no improvement…
Then how to make a revolutionary throw? I think the community is waiting for a great mechanist who gets yoyo addicted. A cad paper doesn’t work, you need real theory to get it right. I have heard that yyf is using a wind hole to test their prototype for right aerodynamics expression? That may be an active change. I am not a pro in mechanics, but I just want to show something after a lot of researching on it I have done.
Firstly is the bearing changing: a normal bearing is tightly sticked to the body of yoyo that will cause more friction, why not using a magnetic bearing, and we can put magnetic material in both of the yoyo body to make the bearing just in the right place.
Second is the axle changing: a normal axle’s screw thread may cause more friction ,why not move the axle’s center part screw thread? I don’t know exactly if the axle can works if applying this change…
Third is the shape: all the yoyo currently made reminds me of the alphabet “x”. so the “x” is just so great that people can not drop it ? I think it’s time to make shape like this! yeah a spintop like shape! So you may ask why this ? just be bored with “x”? not yet. I am trying to challenge the aerodynamics… which lead to a longer spinning time for horizontal throw!
Above is the shape i am chasing…
Below is a java applet from nasa’s free tutorial about aerodynamics which tell us something related to lift.
So it’s easy to see that a more angle degrees make more lift! So what happened when we throw horizontal skill ? it will tilt a bit like the picture showed below. Then you will see the top is more angular while the bottom is plain by this spintop like design which will make more lift. And we need this lift to make our baby glide for longer.
You may see the strange hole-like thing near the a-zone right? That’s another fantastic thinking! Imagining when we throw horizontal, the air behind the yoyo will be blow out in a short time, and there is a pressure difference . if we get some hole , will it achieve some kind of jet effect and give more lift? And for sure it will cut more contact area between string and yoyo which will reduce a lot of friction!
The last is something related to theory: what should be done for a more advance yoyo? I think we should consider the precession. Here is the definition of precession given by howstuffworks
if we can slow down the angular velocity of precession, it’s sure that we can have a longer spin time when doing horizontal tricks. You can easily understand how to get it from wikipedia：
So r is the key to it , reduce the radius will work. We can increase the weight in the middle area of yoyo. Some people may think, oh no , yoyo will spin shorter if the weight is centered. So the wide spin top like shape will help again to solve this problem!
P.S. :there may be some picture display problem you can go to my flicker to see the original pic.