Electric Hula Hoop

RE: Electric Hula Hoop

Andrew J — Wed, 13 Jan 2021 14:54:27 GMT

The great thing about lockdown is that people have plenty of time on their hands and come up with wacky, brilliant ideas such as this. Awesome.

RE: Electric Hula Hoop

Workshopshed — Tue, 13 Oct 2020 06:40:17 GMT

What a great project, love the smoothness of the motion.

RE: Electric Hula Hoop

navadeepganeshu — Mon, 17 Aug 2020 14:58:02 GMT

Very creative project and well-explained concepts!

It's interesting. Thanks.

RE: Electric Hula Hoop

kk99 — Sun, 02 Aug 2020 13:36:53 GMT

Awesome project and explanation. Great work.

RE: Electric Hula Hoop

jw0752 — Sat, 01 Aug 2020 20:21:27 GMT

Hi Doug,

Excellent demonstration and the design and preparation was awesome. This would make a great demo apparatus for a physics class as it covers several important principals. As usual you are the Master!

John

RE: Electric Hula Hoop

BigG — Sat, 01 Aug 2020 20:07:57 GMT

Brilliantly simple and nicely explained.

So how many failures did you encounter before you got it right (you hinted in the video)... Hopefully it wasn't at the James Dyson end of the scale (who is famous for the Dyson cyclonic vacuum cleaner and the fact that it took him 5,126 design failures before he was satisfied with the result).

RE: Electric Hula Hoop

DAB — Thu, 30 Jul 2020 17:59:01 GMT

Great build Douglas.

DAB

RE: Electric Hula Hoop

genebren — Thu, 30 Jul 2020 16:59:56 GMT

Great project and explanation. Well done!

RE: Electric Hula Hoop

beacon_dave — Thu, 30 Jul 2020 15:02:54 GMT

Lots of interesting engineering topics there rolled into a fun project.

With body hooping I tend to find it's more of a forward / backward pulsing motion that keeps the hoop in rotation as opposed to a rotary motion. As the hoop touches the side of the waist you pulse forward and then as it touches the opposite side you pulse back. I use a 2kg weighted hoop though which can give a bit of a sideways pull as it goes around though giving the illusion of sideways motion. I think this is probably why some people find it very hard to get started as they assume that it is more of a rotary motion than a linear one. You also need to get the timing of the pulses right with the position of the hoop in order to drive it sufficiently to keep it rotating.

To get the hoop to climb then introducing a sideways pulse tends to do the trick, however don't overdo is as getting smacked in the face with a weighted hoop isn't exactly much fun. [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-f36fd65d-f9a0-4725-855a-f7c887d2c3ed/contentimage_5F00_4751.png:16:16]

Just need the LEDs now...

Amazing Hula Hoop Dancer Lisa Lottie Spins 6 Phoenix Hoops

https://www.youtube.com/watch?v=tEnhhhWqnWQ

RE: Electric Hula Hoop

michaelkellett — Thu, 30 Jul 2020 08:56:14 GMT

That's great Doug, however, I remember girls at school (never boys, it was 1960) hula hooping with circular cross section hoops.

They could start with it round their ankles and spin it up to waist level, but it certainly didn't use aerodynamics.

There's a not bad article about it here:

https://people.howstuffworks.com/hula-hoop.htm#pt1

I seem to recall a fake (possibly not malicious) anti gravity machine that worked on a similar principle:

The climbing thing went up a thin metal rod which was vibrated - I believe that the combination of rocking motion of the climber

and its friction against the rod resulted in a vertical force. The "inventor" hadn't worked this out.

Perhaps you should market yours as an "Amazing anti-gravity device", and keep quiet about how it really works.

Thanks for posting - nice start to the morning.

RE: Electric Hula Hoop

fmilburn — Thu, 30 Jul 2020 06:08:04 GMT

Hi Doug,

Great project - original, very entertaining, educational, and overall well done.

Frank

RE: Electric Hula Hoop

balearicdynamics — Thu, 30 Jul 2020 06:01:05 GMT

Incredible video. A great demonstration Doug!

Enrico