Excentric to system-axis, within the cylinder a round empty space will be, which is called excentric wall (EW). Center of the excentric wall will be called excenter-axis (black small circle).

Alongside the excentric wall a mass (MP, part of excentric-sickle (ES)) will be moved at circle track.

A rotor-arm (RT) will turn by constant speed around the system-axis. At the rotor-arm, the mass is mounted at a rotor-bearing (RL) that kind, the mass is movable in radial direction.

The rotor-arm is fix installed at a shaft, which will be input-device. At the cylinder resp. cylinder-shaft the output will be available.

Movements in principle
The mass, by rotor-arm turning within the excentric wall, will show differing angles-speeds (here e.g. 25 to 37 degrees).

Related to the system-axis, angles-speeds are nearby like these of rotor-arm (here e.g. 28 to 31 at 30 degrees in average).

Movement of mass will be done by different radius towards system-axis (here e.g. 24 to 36).

Correspondingly, (absolute) speed will differ. Nearby the system-axis, mass will show minimum speed, at its outmost track point maximum speed will be. Thus the mass will be accelerated and decelerated.

The highest inertia-forces outside, will make the cylinder co-turning. Then the mass-point will move at a longstretched spiral track out- and inwards. By overlay of both turning motions, differing angles-speeds above will result.

Power-effects in principle
Even the rotor-arm turns with steady angles-speed, there must be power input at acceleration phase, in order to move masses with higher speed at larger lever arm. At deceleration-phase, inertia will effect corresponding power towards the rotor-arm by thrust momentum. Thus, maintaining motions at a whole won´t cost energy, but naturally to compensate friction.

Centrifugal forces of mass will effect pressure towards the excentric wall. At the outward-phase, the wall will show an ´opening´ spiral track, so the pressure will be reduced. Above this, here the mass will be accelerated by the rotor-arm, i.e. mass will be pulled off that wall, thus this pressure again will be reduced.

At inward-phase, mass all times will be too fast versus the rotor-arm, as radius becoming shorter and shorter. Thrust towards rotor-arm thus will result, as mentioned above. The excentric wall, here towards the mass will show like an inward bended surface. This ´wedge´ will effect centripedal stroke in radial direction. Un-evitable however, there will also result a tangential power-component. This force will result acceleration resp. a turning momentum towards the cylinder. Thus the cylinder will also turn, probably about ten percent of rotor-arm´s speed.

Asymmetric forces
At a rotating system like this, forces not at all will be symmetric. At acceleration-phase e.g., rotor-arm has to bring but few power, in order to keep mass at same angles-speed, however at essentially larger lever arm. Cause right-angles towards this input-power, centrifugal forces will work. Resulting ´diagonal´ line of this power-triagle resp. this ´sling-curve´ will be longer than basic speed plus acceleration. By a minimum of input, essentially higher kinetic energy will be achieved. This surplus of energy, here ´sling-effect´ is called - and men know since thousands of years, slinging is more effective than throwing.

Opposite, the mass by high kinetic energy will ´crash´ onto that wedge of inward bended half of excentric wall. Deceleration here will correspond with acceleration above. By radial stroke however, additional thrust will result, corresponding to additional kinetic energy above. That surplus of energy, at the cylinder will be available for output.

Similar effects
By lots of experiments, Felix Würth did show similar effects and did approve over-unit-effects clearly. At homepage of J.L. Naudin, divers experiments and test-results of similar maschines for inertial propulsion are shown. At a gravity-generator of Werner Bierganns, an ´excentric wall´ also decisive element is. Last but not least, Pavel Imris at a patent-description of ´Double-Sling´ did show by formulas and test-results too, turning momentum will be constant, however energy won´t be constant.

Double-sling
At this Double-Sling-Maschine (EVGM 41) mass (MP) will turn at a long lever arm (R1) around system-axis (SA). Suddenly a barrier (H) will be brought in, which will stop the rotor-arm immediately and same time un-lock a bearing within the rotor-arm. Mass then will turn at a small radius (R2) around the barrier, much faster naturally.

Some questions will result: What´s the turning momentum / kinetic energy before / after the barrier is brought in? Which power towards the barrier will effect? Will the barrier insert power into the system? Or opposite, instead of this, can the power towards the barrier be taken off the system?

Realisation
At my systems here, mass will also be moved at differing radius. However, there is no abrupt change from one to an other radius, but mass is moved contiuously at outward- and inward-bended spiral tracks. Above this, mass here is accelerated and decelerated.

Instead of that barrier above, at my designs excentric walls are used. On the one hand, this wedge will effect radial stoke motions (reducing the radius) and at the other hand pressure will exist towards that wall - part of will show free available output-power.

Swivel-arm-maschine (EVGM 21) a simple gear will show, in order to effect stroke motions. A rotor-arm (RT) is turned around system-axis (SA). At the rotor-arm, turnable mounted a swivel-arm (SH) will be. At its outer end, effective mass is mounted at a bearing (RL).

Mass (ES) will be sickle-shaped. That sickle will be longer than 180 degrees, so it will glide all times within the excentric wall (EW, concentric to excenter-axis (EA)), part of cylinder (ZY, turnable around system-axis).

At the acceleration phase, the rotor-arm will pull mass towards inside, at deceleration phase mass will effect thrust towards the rotor-arm. Above this, asymmetry of pressures towards excentric wall will effect co-turning of cylinder, thus a surplus momentum at the output will exist.

At Excenter-Swing-Maschine (EVGM 22), effective mass again will be sickle-shaped (S). At the center, rotor-arm (RT) is installed, practically a crank-shaft. An excentric ring (R) does show swinging motions (see animation right side), thus allowing different radius. Power-effects analogly are.

At Inertia - Motor (EVGM 32), above constructional elements serveral times are included, one within the other. Input (AN) will be done by the system-shaft (SW) resp. crank-shaft (KW). Around this, excentric rings (R1 and R2) and excentric sickles (S1 and S2) are arranged. These elements, by asymmetric pressure toward each excentric wall, will effect turning of cylinder (ZY), thus a momentum at the output (AB, here by a hollow shaft).

Shafts naturally are mounted within the housing (GE). Several of modules like this may build a compact, totally balanced engine.

By this design, a crank-shaft of special kind is integrated: instead of a crank-rod here both bearings (at the end of normal connecting rods) are included one within the other, several times by these excentric rings and sickles.

By counter-turning swing-motions of elements (within general turning), thus stroke motions and same time relative acceleration and deceleration of mass will be achieved.

Elements of effective mass, thus can relatively free move, up to chaotic motions. However there are two ´bottle-neck-situations´, which are factors of order. On the other hand, even stronger, changing inertia forces automatically will guarantee most effective procedure of movements.

So, at outwards motions, elements can take optimal sling-curve track, thus sling-effect will exist. On the other hand, at deceleration phase, elements will transfere maximum kinetic energy at large lever arm to excentric wall.

These constructional elements here are included several times. To each inner element, neighbouring outer element practically an excentric wall will be. All elements will turn, by variing speed, in principle inner elements faster than outside elements.

Inertia forces inside will be drive input to outer elements. At this motor, practically and really, inertia will be re-inforced by several steps.

That cross-sectional view of inertia-motor, totally is conform to crop circle picture ´Threefold Halfmoon´. It would be of extreme importance, when this interpretation here would come true.

Urgent appeal
It´s common knowledge, perpetuum mobiles can´t exist. Thus my claims above, can´t be true. However, my suggestions not totally trivial are - see energy-constance-problems above, well researched and documented by different explorers - and many inexplicable physical phaenomenas exist, some new detected e.g. by Felix Würth and other inventors as well.

Thus I do hope, these ideas here will seriously be checked by experts, in order to solve theoretical this problem, to design formulas and calculate optimums. On the other hand, modells should be constructed, in order to approve practically effects predicted. These maschines should easy be constructed by well known techniques, as exclusively circle-round or plan surfaces are used.

Workout
At following chapters and sections, these conciderations here are described in detail. By diverse concepts and designs developement of these ideas is shown. For intensive studies, preferably the download-files may be used.