iTopSpin

Please login or register.

Login with username, password and session length
Advanced search  

News:

Author Topic: Online contest: Fastest boomerang?  (Read 757 times)

ta0

  • Administrator
  • Olympus member
  • *****
  • Posts: 14284
    • www.ta0.com
Re: Online contest: Fastest boomerang?
« Reply #15 on: March 02, 2024, 01:38:31 PM »

Tried again this morning with the Love. Normal throw, as hard as I can while keeping control: the best I'm getting is about 8400 RPM max, so extrapolated to zero a little higher, but lower than 9000. I did get a few higher values displayed but those were measuring errors as the values were jumping around. I generally get very smooth decay measurements starting from the first value.
Logged

ortwin

  • ITSA
  • Hyperhero member
  • ********
  • Posts: 1477
Re: Online contest: Fastest boomerang?
« Reply #16 on: March 02, 2024, 03:14:40 PM »

Tried again this morning with the Love. Normal throw, as hard as I can while keeping control: the best I'm getting is about 8400 RPM max, so extrapolated to zero a little higher, but lower than 9000. I did get a few higher values displayed but those were measuring errors as the values were jumping around. I generally get very smooth decay measurements starting from the first value.


Hmmm, I wonder what is going on there!
This what my Love looks like before a throw:





The string is 140 cm long and 2 mm thick. You can see the wrap height. I use this type of string with most of my tops up to the size of Augusta.
I have to hold it tip pointing downwards. I only learned to throw a top with tip downward this year in Marines, and that was with  a Sweetle with a far longer string that I am usually using for that. Anyways, I found I can only throw Love well with tip down and it felt awkward at the beginning. The motion of my throw can be seen in that video above. After the last set of strong throws (only about five or so) where my last spin decay curve comes from, I really felt my arm, that kind of surprised me.
How does your spin down curve compare to mine where they should be about the same? Are the spin times you get from 8000 down to zero comparable to mine in that range? - Of course the state of the bearings can make a huge difference here.

I thought about the possibility of analyzing the speed of a top by filming it in slow motion. I estimate that you need at  a camera/cell phone with at least 500 fps (frames per second) to measure a speed of 10000 RPM.

« Last Edit: March 02, 2024, 03:23:40 PM by ortwin »
Logged

In the broader world of tops, nothing's everything!  —  Jeremy McCreary
Pages: « 1 2  All   Go Up