Not the thing you're talking about, but I remember having a lot of fun with these: https://instructional-resources.physics.uiowa.edu/demos/10c1020-propeller-st

Not the thing you're talking about, but I remember having a lot of fun with these: https://instructional-resources.physics.uiowa.edu/demos/10c1020-propeller-stick-hand-helicopter https://instructional-resources.physics.uiowa.edu/demos/10c1... Just a stick with a 2-blade prop on the end. You spin the stick between your hands and see how high it'll go. But that got boring real quick! The real fun was trying to shred your friends' faces with it at 10 paces away.