Roll on the 20th June

[DarkStar_DS9]

Archer's last post (on www.surphzup.com) was the following:

... so will this rock back and forwards forever? ...

If I didn't miss something: no, it won't. Because the tube won't sit on one end and wait until the foam went up as far as it can - it will start to move as soon as the foam passes the center and begins to shift the weight to the other side. Therefore the foam will never reach the tag and the whole thing will balance after a few swings.

Thats assuming that the foam will actually move in the right direction, which I am not sure it does in the first place.

At least that's my best guess, let me know if I got something wrong.

[oak]

Respectfully, Archer, I do not think the banana-tube device will rock back and forth, but for a reason different than DarkStar gave.

If the foam is sufficient to float the rod-weights-foam assembly toward the raised side of the tube, then the rod-weights-foam assembly is, taken as a whole, lighter in weight than the water it displaces.  Once the assembly rises, water will have filled the lowered end of the tube.  Since water is heavier than the rod-weights-foam assembly (cubic inch per cubic inch), the lower end of the tube will remain heavier than the raised end, and everything will just sit there without moving further.  If I?m wrong, I?m happy to be corrected.

[Rolo]

Respectfully, Archer, I do not think the banana-tube device will rock back and forth, but for a reason different than DarkStar gave.

If the foam is sufficient to float the rod-weights-foam assembly toward the raised side of the tube, then the rod-weights-foam assembly is, taken as a whole, lighter in weight than the water it displaces.  Once the assembly rises, water will have filled the lowered end of the tube.  Since water is heavier than the rod-weights-foam assembly (cubic inch per cubic inch), the lower end will remain heavier than the raised end, and everything will just sit there without moving further.  If I?m wrong, I?m happy to be corrected.

You're ignoring the weight of the tube.  Once it's rolled onto one end, there's more of the tube on the raised side of the equation and if the tube is heavier than water this could offset the weight of water in the lower end.
Or not.
Rolo

[spinner]

Eskimo Quinn said:
"you build it!!! that is a complete description, no such thing as perpetual motion?? oh fucking please, i said six ways from sunday, that is 3 mr newton.

Bet no newtonian on earth can even give you a math reason it wont rock!!! Fucking energy shares?? what are they worth again?? batteries charged to run electric or browns gas cars? what is oil worth again??"

Nice... A "perpetually resting banana". And that was the 3rd of your perpetual motion devices?
Ah, so many ideas, and so little time...

[The Eskimo Quinn]

The error was mine, i did leave out that it needs a crawler, the is the inside of the bottom of the tube must have cog serations and there must be two cog wheels one on each end, what you missed was the inner rod and outer tube were not connected, the outer tube is simply lighter than the rod.

Newtonian math says that any perfectlty formed item that has equal balancing halfs will balance on a fulcrum, yet even in a vacum this is not true, for physics defies the math in real life, even if this item were machined by god himself to be perfect it would still not balance? what is it?

Two circles can never balance on each other, you can remove the top half of the circle to get your semishpere or banana, but even though in this case i agree the math says two equal halves hsould balance, not even NASA can do it, and when the flcrum circle is smaller it gets even worse, the point where maths and physics do not work, and again so much for math.

and yes you forget the tubes are longer and there is no weight fo water on one side as it always finds level.

Try again

Sorry bout the site, it seems to be toast at the moment.