Grassroots Mechanic Movement

Self-Propelling PIE 2.0 running at a faster speed. This is Video 4 in this set of 4.

The PIE 2.0 self-propelling! There are 4 videos that I am posting here.

The PIE 2.0 self-propelling! There are 4 videos that I am posting here.

The PIE 2.0 is self-propelling! I re-phased the wheels and put it on a set of steel ball bearing wheels. The floor I'm running it on is not perfect, it likes to get stuck where there are years of grime that needs to be steam cleaned off the floor, and also gets stopped climbing onto the next floor section as it is slightly higher and the PIE rolls back between pulses. There are 4 videos that I am posting here.

I re-phased the wheels in hopes of getting it to self-propel. Just need to add wheels under it now.

The copyright has long run out on this video. The quality is sometimes very poor, much of it was edited together from very old VHS tapes, but the info that comes from Roy Thornson is priceless!

I saw a video online that showed the making of wooden gears with soft teeth made from a timing belt. I decided to see if that would be a feasible way to make "quiet" spur gears. Here is my 1st attempt being spun with air pressure to make sure that speed won't be a problem.

The 1st gear seemed usable, so, since it needs a gear to run against I made another one. They are fastened to a piece of 3/8" thick steel which is clamped in a vice. They do seem to be pretty quiet compared with anything else I have tried!

Testing the PIE 2.0 on wheels. Although the Hybrid Effect when mounted in the truck was tested and proven, the rig did not roll easy enough to Self-Propel. This video demonstrates the hybrid effect as the PIE was easily pushed with one finger while running. Further testing is under way to enhance the self-propulsion mode of operation. The full info set is in my blog, .

This was a quick video taken to demonstrate how easy it is to visually see that the timing is off. Note how the PIE shakes violently side-to-side. Once properly adjusted, the timing has not been an issue since.

This was the PIE 2.0 as it was first installed in the test vehicle, before the first test drive was made.

The PIE 2.0 is ready for vehicle mounting so that testing can begin! It seems to be producing a great deal of power, and I think it could easily break itself if speed was increased too much. Input power is from an old (but still functional) Dewalt 18V VSR cordless drill. This battery pack was worn out, so I gutted it, installed wires, and it will now run directly from a 12 to 24V battery safely.

The timing May need a bit of "tweaking", but it seems fairly close for now.

Now it just needs a mounting and cover (maybe from the PIE 1.0) so it can be real-world tested.

It does still jam some times during start-up, but since it is not most of the time like it was, that problem can be dealt with after the round of testing. After all, it is a prototype and I am not going "sweat the small stuff".

I am very please so far with the idea of the weak torsion springs to keep the PIE 2.0 from jamming when starting. This build is shaping up to be awesome!

The PIE 2.0 is progressing very nicely. I am adding a second wheel but it is mounted above the first one rather than beside it. There was a problem with starting it up because the weights could easily catch the stops on the sun gear axle so some very weak torsion springs were added to stop the issue. Here I am very pleased with the first spring added.

The PIE 2.0 with 2 weights installed, running on the chain drive. The whole assembly is mounted to a board so it can come off the bench. Still some more work to be done before the 2.0 is ready for a proper debut.

This is the new chain drive being tested on the bench, before starting to build a new base for the PIE 2.0. Powered by a cordless drill just to verify the chain & sprocket combination.

Here is the still incomplete PIE 2.0 with 2 planet gears and weights. This may prove to be a powerful design. All info is being keptopen source and others are encouraged to build one for themselves! Full, free, info is available at . Thanks for watching.

Improved Weights and Stabilizing Bar Added. This is the latest set of improvements added while getting ready for actual on-road testing. The on-road test phase lasted a week, gathering important data and proving that this works well as an add-on hybrid drive in a motor vehicle. The Pulsed Inertial Drive (PIE) version 1.0 has been deemed a success and now major improvements are being done to build a new unit, PIE 2.0 is now being assembled and bench tested. All info is open source and available at: ---Thanks for watching!

Here is a bench test of the newly improved, but incomplete PIE 2.0. More info is available at:

This is two wheels in the same direction with better weights on the planet gears and a belt tensioner. These weights are approximately 1.25 pounds. This is one of the first test runs at its slowest speed.

Found that there was a lot of intermittent slippage in the belt drive. I wanted to correct that and be able to run two wheels in the same direction. The choice was purchase sprockets and chain or make my own timing belt sprockets for used belts still kicking around the shop, so I made my sprockets and this was the first no-load test run.

Slow speed variation of a Thornson Inertial Drive Engine. Has enough power to push objects along a level work bench surface. The unit is rolling on ball bearings. This is the 1st functional demo. Better prototypes to come!

4 Wheel Successful Test Run


Created 3 months ago.

23 videos

CategoryScience & 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.