Comments on: Going Yo-Yo Over the iPhone

By: Yo-Yo para cargar la bateria de tu iPhone | iPhone Gurues

Yo-Yo para cargar la bateria de tu iPhone | iPhone Gurues — Tue, 14 Oct 2008 12:46:53 +0000

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By: Mr. Glitters

Mr. Glitters — Thu, 02 Oct 2008 18:42:17 +0000

I would love to get that iYo!

By: Recarga el iPhone con un yoyó. - Fuera de cobertura - Teléfonos móviles y actualidad

Wed, 01 Oct 2008 07:34:07 +0000

[...] Vía | Yanko Design [...]

By: Selección Digital» tuexperto.com » iYo, un yoyó para recargar el iPhone

Sat, 27 Sep 2008 00:21:42 +0000

[...] Vía: Yanko Design [...]

By: Έξυπνος φορτιστης για iPhone | akouseto.gr - το καλύτερο ελληνικό blog, όπως όλα τ'αλλα...

Thu, 25 Sep 2008 18:04:06 +0000

[...] [via] Tags: charger, iPhone, yo-yo, φορτιστης iphone [...]

By: Nicholas Sherlock

Nicholas Sherlock — Wed, 24 Sep 2008 08:01:15 +0000

An iPhone battery stores about 20,000 joules of energy. If you pedal on a stationary bike, you can generate power at about 100 watts, that’s 100 joules of energy per second. So, you could charge your iPhone battery up with 200 seconds (over 3 minutes) of pedalling on a stationary bike.

I have a very hard time believing that you could generate the same amount of energy by throwing a yo-yo 30 times!

By: iPhone Charger | Student Tech News

iPhone Charger | Student Tech News — Wed, 24 Sep 2008 07:08:39 +0000

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By: iPhoneをヨーヨーで充電！？『Yo-yo powered cell phones』｜デジタルマガジン

iPhoneをヨーヨーで充電！？『Yo-yo powered cell phones』｜デジタルマガジン — Wed, 24 Sep 2008 05:00:31 +0000

[...] via Yanko Design [...]

By: Dr. YoHair

Dr. YoHair — Tue, 23 Sep 2008 23:44:54 +0000

When you toss a yoyo down, you often put *much* more rotational energy into it than required to just get it to come back up. Modern yoyos have been known to sleep for as long as 18 minutes. Even with great bearings and good balance, that takes a pretty serious throw (>90MPH).
See Don “Captain Yo” Watson’s “Yoyo Physics” pamphlets for this stuff in great detail.

And as long as it still sleeps (even with the drag) for more than 15 or so seconds, you can still throw “old school” string tricks on it (say, “Split the Atom”).

To really acquire some current, though, I suspect he’d be better off balancing it for “looping” rather than sleeping; if you check out “2A” yoyo players, they’ll keep the thing in motion for a long time without catching and have a lot of fun with it.

By: Michael Wendell

Michael Wendell — Tue, 23 Sep 2008 16:23:13 +0000

This doesn’t make sense to me. When you toss a yoyo down, you give it jst enough energy and spin to make it climb back up to you. If we were to place a parasitic drag on it, through the use of a motor/generator, wouldn’t the yoyo itself stop yoyo-ing?

I guess you could throw a lot more power into it when you tossed it downward, but there are probably better way to use your own energy to generate electricity. Take look at the OLPC pull-cord generator concepts for example.