Thank you for the suggestion, so how should i improve the horizontal spin?
to shorten the string or tie a pipe-like thing to change the position of fulcrum and shorten the "r" in the equation?
to reduce the area of the wall which would cause friction? (like the gear-kind thing near the...
modern metal yoyo with ball bearing works totally different with the old. it can spin about 5mins within one throw for some reason. and can it spin about 1min if I throw it horizontally? you may wonder about what is a horizontal throw. then see the video post below.
https://vimeo.com/39247415...