Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
Ambivalent? Are you sure?

idea: add, search, annotate, link, view, overview, recent, by name, random

meta: news, help, about, links, report a problem

account: browse anonymously, or get an account and write.




human yo-yo
(+1, -1)
  [vote for,

Dare-Yo-Slow-Mo is a cross between a yo-yo and a bungy jump. It's called Dare-Yo-Slow-Mo because only the most daring will submit to its subtle terror.

The apparatus involved is quite simple, and consists of a large yo-yo, with a place for locating a person in the central part of the "spool'. Naturally they are prevented from being flung out, as Dare-Yo-Slow-Mo descends and ascends on its relentless yo-yo journey.

A strong cable is wrapped many times around the inner spool containing the volunteer Dare-Yo-Slow-Mo participant. This cable terminates in a winding arm that allows the Dare-Yo-Slow-Mo to free-fall descend, but can also jerk it up and down to maintain the motion. A very tall platform acting as the launching pad completes the arrangement.

Now off you go! Try not to eat too much before your Dare-Yo-Slow-Mo session.

xenzag, Mar 06 2015


       Is your body wedged along the axis of spin, or is it spread-eagled across one of the disk faces?
pertinax, Mar 06 2015

       Spread out like an X. I was going to go for totally "loose" inside a cage, but I think that's too extreme, even for me.
xenzag, Mar 06 2015

       Someone needs to compute the max rate of spin at the bottom of the cable, and the G-forces experienced then. It might be too much for the body to tolerate.
Vernon, Mar 06 2015

       If the barrel is 1m in diameter, and is flung off a 20m bridge, it would reach a speed in the region of 40mph before reaching the 'apex'. If you assume no friction, and have the barrel spinning at 18.6m/s (roughly 40mph) then it must be spinning at 18.6/Pi = 5.9 revolutions per second - which is approx 360 rpm. The G forces experienced at the circumference at this point would be around 144G - trained fighter pilots tend to black-out and die around 9G. Suddenly reversing the direction of the spin in the opposite direction at the bottom of the jump should temporarily double these forces to 288G.   

       A typical bungee jump is around 75m.   

       Perhaps we should rebrand this as some form of cruel and unusual capital punishment?
zen_tom, Mar 06 2015

       Now you know why it's called a halfbaked idea. With a freely rotating centre, the person would stay in the same orientation, and only experience a type of slow motion bungee jump.
xenzag, Mar 06 2015

       The direction of spin does not reverse at the bottom. But the velocity of the device's centre of mass does reverse direction extremely suddenly, from +xmph to -xmph in the distance of the radius of the drum.   

       And it's not freefall since gravity has to accelerate the device rotationally as well as vertically, as the cable unspools.
pocmloc, Mar 06 2015

       name edit
xenzag, Mar 06 2015

       //If the barrel is 1m in diameter, and is flung off a 20m bridge, it would reach a speed in the region of 40mph before reaching the 'apex'.//   

       No. First of all, by "apex" you mean "nadir".   

       But even so, your calculations are wrong because they assume that the barrel has no angular momentum.   

       A barrel unwinding on a yo-yo rope will fall more slowly than a barrel just dropped. In the same way, a normal yo-yo does not descend at the same speed it would if it were just dropped.
MaxwellBuchanan, Mar 06 2015

       Exactly. Some of the gravitational force is bled off to spinning a body with some initial rotational inertia.
RayfordSteele, Mar 06 2015

       //subtle terror// nothing subtle about projectile vomiting.
FlyingToaster, Mar 06 2015

       Man that is a bad name.
tatterdemalion, Mar 06 2015

       I actually don't think this would be that bad. In fact it could be quite relaxing and not stomach churning at all. Drat!
xenzag, Mar 06 2015


back: main index

business  computer  culture  fashion  food  halfbakery  home  other  product  public  science  sport  vehicle