My Invention

[zoelra]

I see what you are saying about the force being less because of the angle.  In one of my ealier posts, I suggested a higher drop position because the force would be less near the top (also because of the angle).  Same idea as your suggestion, except the weight would have to be "pushed up" rather than "pulled up".  I like higher drop points because I want greater CF at the bottom of the swing, hopefully to do more work.

Mounting on a wall does have it's advantages.

[johnny874]

I see what you are saying about the force being less because of the angle.  In one of my ealier posts, I suggested a higher drop position because the force would be less near the top (also because of the angle).  Same idea as your suggestion, except the weight would have to be "pushed up" rather than "pulled up".  I like higher drop points because I want greater CF at the bottom of the swing, hopefully to do more work.

Mounting on a wall does have it's advantages.

  Once you get to know me, you'll find sometimes I can just enjoy doing the math. I am hoping this weekend to build a test fixture.
One thing about lift is once the angle goes over 45 degrees, the amount of work is greater than the cf it would generate. An example of this is a 1 lb. weight could lift a 2 lb. weight to 45 degrees. And if 2 one lb. weights are used, it should lift the pendulum a little higher.
That's when they ( a 2 lb. and a 1 lb. weight) would be in equilibrium. And if you look at the shift in balance, going with 45 degrees, if the bob is 10 in. from it's fulcrum, it would shift 14 inches.
How they translates into useable force, not really sure. But what is known is that once the weight is beneath it's fulcrum, it would have shifted 7 inches. That would mean the counter weight could possibly be in closer about 3 1/2 inches.
What I like about your set up is that it can probably give a good idea if it's worth pursuing. I think it can test most of the parameters to see if the potential for maintaining a single oscillation pendulum is possible.

edited to add; @All, i have asked Stefan to change the name of this thread to single oscillation pendulum.

[johnny874]

  one thing I figured out is a 10 lb. weight would have about 12 ounces of cf if it swung from a height of about 12 inches.
If the pendulum is 12 incnes long, a 30 swing equals 6 inches. If the pendulum is 18 inches from center, it lessens the force of the weight by about 1/3rd. This is where tbe most potential might be able to be realized.

[johnny874]

  zoelra,
to try for a perpetual pendulum, what needs to be known is how much motion it loses swinging from one side to the other and back again. then the question would be when the cross beam tilts to the cw side, can it lift the pendulum sufficiently to compensate for it's entropy.
if the pendulum is pulled up from a 45 degree angle, the hoist can probably be over driven with a 1.5:1 ratio.
the pendulum can be caught at it's inner most swing limiting how much the cross beam would need to tilt.
will be relaxing so I'll be ready to go this weekend.
of course, some would say God gave this to me because it's what I need when what I wanted was a family.

edited to add, zoelra, here is a video of a weight swinging with little resistance. as one person mentioned, can't tell angles without calculus. wish I would have known that sooner.


http://www.youtube.com/watch?v=iFS1so_sccI&feature=youtu.be

edited to add; maybe tinselkoala can do some calculus to mark the swing from one side to the next and back again to find it's entropy. as he said, it's over my head. And if you pull the pendulum's weight from an angle of 45 degrees, it can move the weight 1 1/2 times more than the cw while the cw weighs half as much. I'm sure somewhere they can say a book says that but it would have to be in other terms like w=md, but then, how is that in literal mechanical motion or application ?
love it when someone links all sorts of material but is vague as to what it says and where it says it. means they didn't read the book they're quoting, only heard of it.
         any way, do need to take a break. my medical situation is my life. it's better than trying to work around idiots who are to lazy to consider something. seems then it's more of a control issue. you know, someone is doing something and they aren't the lead dog. then again, I thought that was why Stefan started this forum, so people would have a place to discuss idea's that might not be main stream.

[zoelra]

The attached video shows the results of running the cord along a 45 degree path to the pendulum bob.  The counter weight raises instead of falling which says there are other forces in play.  My guess is this is due to a portion of the weight of the bob still being applied to the pendulum shaft and then the mail lever.