Grassroots Mechanic Movement

After the last on road test went poorly, I decided to go back to basics on the PIE 4.8. The Wheels are re-phased to “self-propulsion” and since I know how it acts with 4 gears turning and 4 weights moving, I thought it would be a good idea to see how it will work with just 2 weights total. I know that I misspoke on the video and said 2 gears per wheel, I meant to say 2 gears total.
I did install the 2 weights that are not being used for propulsion onto the wheels, but they are only there to balance the wheels a bit so that it does not shake itself so hard that something breaks.
This is a first step taken toward finding out which forces cancel each other out, and how to prevent the cancelling of forward thrust forces. Things “seem” to be going well with the cancellation of reversion forces, now the forward thrust needs to be made better.
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The micro switches on the SDC (Speed Differential Control) circuit were having problems with the roller wheels and levers. Tokio Muramatsu ( suggested using a “proximity sensor” instead of the mechanical micro switch, so I decided to try these simple non-contact magnetic switches. I am pleased so far and I will post the results using these on the next road test.
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Road Tests Continue
After a short delay, Road Tests Continue! The PIE 4.8 is in the truck and is rephased for hybrid use. The SDC switch broke when one of the actuators came loose and needs to be replaced, but I intend to road test “as is” since there have already been so many delays in getting this completed.
The video shows the vehicle “swaying” side-to-side due to alternate side thrusting, not "sideways thrusting". It will be interesting to see how this affects handling while driving at highway speed…
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Self-Propulsion Compilation.
This is a short video of successfully self-propelling Thornson and PIE inertial drives, the video was created for a portion of a presentation given on 6/26/2001 for the APEC conference.

Video Timeline From the Beginning to the PIE 4.8
This is a video Timeline of the PIE project from the first 2 gears through the PIE 4.8, the video was created for a portion of a presentation given on 6/26/2001 for the APEC conference.

The PIE 4.8 is ready for hybrid testing. After showing promising results in its first on road test set, it is time to get it adjusted properly and do some “serious” road testing! This video shows the initial re-phase. It is not adjusted properly yet, and you can see in the video the wheels are cross-thrusting, i.e., the LH wheel is pulling right, and the RH wheel is pulling left. I am also going to attempt to install more SDC actuators to accommodate the new phasing.

I had previously said I did not believe the swing test to be accurate, but there have been a lot of people asking for it. So I decided to go ahead and demonstrate how it passes this swinging test. I am also showing how and why it can fail the test.
Since I am not out to “prove” anything, just demonstrate the machinery I am working on (and with) this actually seemed like a good idea.
Here is the main point I want to make. ANY pulsating drive (mine or any other) will not show good results unless it is synchronized to the time-base set by the swing itself. The longer the swing, the slower the machine has to run otherwise it is just a vibrating mess!
This test had the PIE running VERY sow so that there was only about .5 KG of thrust, but it is a good demonstration of linear thrust either way.
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PIE 4.8 Being Fitted Into The Motor Vehicle For On Road Testing
This is a short (noisy & unplanned) video... The PIE 4.8 is ready for final hook ups to the pickup truck it will be tested in. In this video it is sitting directly on the steel bed of the truck running at 53 RPMs giving 106 pulses per minute, and the truck is inside a garage, so it is pretty loud on the video. I just need to make a new rain cover for it and hook up the wires for operating it from the cab (simple on/off for now).

The new frame is complete (I think) and about ready for testing. I may still put a bar across the axles to make it as stable as possible. I am reasonably certain that if it were turned properly on the cart (and fastened to it) the assembly would self-propel. Note the way it pulls the wheels off the ground!
Please excuse my dirty hands, I work for a living and dirt is a constant companion.
Thanks for watching. More to come soon.

This is the first test run of the PIE 4.8 with both wheels running on one drive motor. It is not complete, but the motion is reasonably good. There is one weight sticking a bit, and for whatever reason the video seems a little grainy (Very warm and humid, maybe better next time). I will be making the necessary improvements and completing the assembly ASAP so the on-road testing can begin.
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To answer the accusation and question many people have had, no, the PIE is not “pushing” on the surface of anything to make itself move. It is not a stick-slip drive in any way. I used just one half of the 4.8 to demonstrate this, and the setup was only quickly thrown together out of frustration.
Many have wanted to see it suspended by wires, while others have wanted to see it in a canoe on the water. I believe that those tests are too easy to fake, and I do not want to subject the PIE (and myself) to possible skeptical speculation. I saw another person (a Russian block physicist) do the same as he felt it would be the least possible way to fake anything, so this is what I have done.
I am sure that it could pass virtually any test, but I simply do not have time for that right now, so now the scheduled testing can resume.
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This is the first official test set of the PIE 4.8, not only confirming what does work but also confirming suspicions and theories about what will not work. Each individual unit (CW & CCW) will produce a bit more than 4lbs of thrust, and together there is more than 8lbs of thrust when synchronized. When “out of synch” the thrust is less than either of the two individuals, THAT is VERY important information!!! I will be posting test results on the blog, and I will be posting a link to it as soon as it is available. Go ahead and believe what you wish, but this is simple, functional and will be self-propelled when placed on a different trolley (cart). There is room for vast improvements and there “should” be hundreds of experiments to be performed by hundreds of people since this is so simple and inexpensive to produce!
Thanks for watching!!

As I am getting the weights changed to the PIE 4.8 design for the CW wheel, the CCW unit is still on my workbench so I decided to place a couple of pipes under it to check for forward propulsion and reversion. I am quite pleased, even at very low speeds the PIE 4.8 CCW wheel self-propels with almost no reversion! I am hoping to have the two halves working together in a few days for initial testing.
A lot of work has gone into the improvements made over the last year and a half, and it is great to see this hard work "paying off" by working as well as it does at this point in time!
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Bench testing the PIE 4.8 with the Speed Differential Control (SDC) installed. The redesigned outer stops bring the model number up to 4.8. I will be changing the stops on the CW unit to match before combining the CW & CCW units into a single PIE assembly.
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First test run of the PIE 4.7 CCW rotating wheel. SDC is not hooked up yet to the speed controller. Should be ready to place in tandem with the CW wheel very soon. Thanks for watching!

Assembling and adjusting the PIE 4.7 CCW wheel assembly. The weights going for their first "spin" without any stops or limiters in place.

A quick look at the "Halo Bracket" which attaches the weight(s) to the planet gears.

The PIE 4.7 project continues after some small delays. The new counter-rotating wheel, sun gear and planet gears are ready to have the weight mountings installed. This shows the smooth operation and one of the two dead-blow weights... along with dirty working-man's hand(s). Thanks for watching, more to come soon.

Here is my replicated Tolchin/Shipov Drive using a brake circuit on the motor to stop it from overshooting the 15 to 30 degree mark of "past center". It does work, and it does have forward propulsion, but the Trolley and framework is much too heavy to be propelled by this drive. Using a rubber band as a "tow strap" it will easily "tow" forward, but not backward. I am not taking the time right now to attempt to measure thrust, I am estimating around 4 to 8 oz of forward thrust with approximately 2 oz of reversion. More than adequate for a small "toy" inertial propulsion device (might be a market for that as an erector set kit) but not what I am after for the amount of electrical energy input and personal effort. If anyone wants more information on building one for yourself, feel free to email me [email protected] or message me directly from my website at and I'll get back to you as soon as I can. Consider this project "mothballed" as I am not planning on dismantling it unless I am desperate for parts, although the speed controller will definitely be repurposed. Now... Back to the PIE... Let's "Git 'Er Done" and Thanks For Watching!!!

This one is for those viewers who like to slow videos down, zoom in and really analyze the mechanicals. It is also beneficial to those have read the papers written on the testing done by Shipov concerning reactions and nullification of reversion. This particular video shows how the top hub is rotating with one of the weights, and how smooth the action of the rotating assembly is.

Here is the Shipov drive to compare with the Tolchin. This uses an electric motor, and sensors to adjust the speed up and down. It looks like the weights are reversing direction, but they are not. The weights pass very close to each other but they are making full revolutions. The disc on top is for the sensors, and I believe the miter gears are underneath the assembly with one axle passing through the other (one is hollow).

This is a clip of the original Tolchin drive. It uses a spring motor (wind-up) power source and appears to have an inner assembly and outer trolley. It looks like he was using rubber bands between them, and the inner assembly may have a slight downward slope to allow gravity to help. Those were eliminated in the Shipov version with an electric motor and controls. I will get a video of that posted here for comparison.

Testing the T/S drive with an extension on the switch, and on wheels. The motor drive is certainly not ideal, and the "slow-down" does not occur quickly enough to stop the reverse action (reversion). Next up will be the installation of a brake mechanism to control the slow down at the correct point in its rotation. I used my hand as a brake (not advisable - it hurt) at which point it demonstrated the necessary lack of reversion for self-propulsion.

This is a Tolchin/Shipov test setup, being built to measure some of the effects of this drive vs the PIE system. I am not abandoning the PIE project, rather I would like to see if additional tech such as the Tolchin/Shipov 4-D Gyro setup could enhance the PIE configuration. This id the first test run with an SDC controller (from the PIE) installed. I think the micro switch should probably be held down a bit longer, but overall, I am pleased with the test rig. I will be refining the build a bit before testing on wheels and testing it as an anti-reversion device for the PIE. For anyone interested, the swinging weights measure .580Kg each for a combined weight of 1.16Kg and are made from 1” round stock with a small center hole (about 5MM). The drive shafts are all 8mm plain rod and the drill was an obsolete 12V B&D 3/8” cordless.

I have had a lot of people contact me with the idea that the PIE should run at a higher RPM, and many cannot seem to understand why I choose to run at specific RPMs when logic says there would be more power generated at higher speeds. This was an impromptu experiment that visually demonstrates how finding the right harmonic for a specific design will generate a lot of power without destroying itself. Thanks for watching!


Created 1 year, 2 months ago.

75 videos

Category Science & Technology

Grassroots Mechanic Movement, a FREE and OPEN SOURCE project to promote collaboration & free information sharing for the Pulsed Inertial Propulsion Engine (PIE for short) which is a modern rework of nearly forgotten reactionless propulsion designs. PIE is based originally on the work of Roy Thornson and built upon with a freshened approach and a different set of objectives. Watch, join in, comment, ask questions & enjoy. ALL information is 100% free and available at:
The only rule: Absolutely NO flaming, defamation, rudeness, or other negativity regarding the study or use of this technology or those persons interested in it in any way.
Thanks for visiting & I really hope you build one too.

I now have a web site highlighting a builder's manual showing anyone wanting to learn about inertial propulsion how to build a functional PIE 1.0 and 2.0. Please visit at