Big try at gravity wheel

[fletcher]

A thoughtful post by MrVibrating at BW.com re observations on the RAR concept - includes a simple sim.

http://www.besslerwheel.com/forum/viewtopic.php?p=118005#118005

[minnie]

Hi,
   I've been looking at the Roverbial balance and irrespective of where you position
the weights on the trays the work done is the same so there is no means of obtaining
any gain.
    The machine in question is quite tiny when considering using gravity as a power
source. Fletcher pointed this out to me when we were discussing using pressure and
fluids. Even if something worked the operating speed would have to be kept so low that
the useful output would be minimal.
                        John

[Red_Sunset]

Red .. here is a simple sim of a Roberval system, with lever arm & mass replacing one horizontal member - the lever arm can be latched [square pin joint] to either the vertical strut of the pantograph or the tilting arm to get up & down motion thru imbalance of forces - that is not & has never been in dispute AFAIK - run the sim to see the potential problem - I watch this RAR attempt with interest to see if they have a creative answer to the dilemma.

Gents,
Hi Fletcher, good to hear from you. I spent some (too much) time today creating some pictures to clarify previous postings on the workings of Renato Ribeiro gravity system. Do keep in mind that the drawings only demonstrate the principle to OU used in the invention, NOT the workings of the whole machine as shown in the pictures. When it comes to the whole machine and the modifications done to it, I have also many questions. For example, why is the weight bar hinged and other trip assemblies....ect.
The drawings used are as close as possible to scale to the actual machine build, I overlayed one of the drawings to get the size proportions correct.

In the attached pdf,

Page1: Picture of the limit stops on the center flange (vertical vs crankshaft push rod)
Page2:  Picture of the end stop to fixate the crankshaft push rod to the triangle that holds the weight.
The weight loading creates the lever connection between the crankshaft and the weight.  In this position, the roberval has no other function other than a positioning guide for crankshaft push rod.
Page 3:  Picture of the stop that initiates the working of the roberval, this engages the triangle with the roberval (the lower lever endstop would be disengaged at this point). 
The alignments are made possible by the positioning of the crankshaft, crankshaft push rod and the arc stopper. The weight will always apply a counter clockwise pull on the setup.
Page 4: The model drawing pulled from the official drawing
Page 5:  Five positions are shown during one cycle of the system.
The first 3 show the down ½ cycle and the next 2 show the up cycle.,  shown is also how the system switches from lever mode to roverval mode. There should be enough detail on the pictures and associated text to make it self explanatory.
The approx. OU advantage is the horizontal length of the triangle

Regards, Red_Sunset

[Red_Sunset]

Gents,

In an attempt to expand on my previous 5 step process sequence, by adding elementary force vectors to it, I am starting to doubt my initial understanding of work and rotation done here.
Can someone enter this into a simulator to calculate relative force and direction.  The rotational crankshaft seems to change the picture pretty drastically.
Attached is a relative force direction drawing in pdf format

Regards, Red_Sunset

[Red_Sunset]

Roberval functionality in RAR

My deduction is changing rapidly on the workings of this gravity engine.
Maybe there is some information missing, but with the info currently information seen, the roberval does not have the functionality initially thought off.
The only function it serves is to allow the triangular extender truss to remain near vertical at all times.
The force generation appears to be by weight, not by lever, so this working concept needs to be re-evaluated
Back to the drawing board.

Regards, Red_Sunset