Recent content by Russ Edmonds

You might be right. Here is a high speed video of the tip movement viewed from below. It shows the tip making small counterclockwise circles due to the unbalanced flywheel.

Finished version 3 of a motorized top with unbalanced flywheel. Used a larger more efficient motor and two AAA Ni-Cd 1.2 volt 150 mAh cells in series for power. The question is how does this top work? Before commenting, please carefully read the following. The top can be thought of as two...

As a follow up, here is a link to a great little paper on the current theory about the sphere splashes: https://www.nature.com/articles/nphys545.pdf

Caution: This video has music. Turn sound off before watching if this bothers you!

Follow up Blender tippe top animation showing the top's motion in real time with Eevee motion Blur. As before the location rotation keyframes were generated with a 6dof tippe top simulation coded in Python.

That's true, I was going for a more realistic render here for aesthetics and to make the comparison with high speed video a little easier. I'm in the process of comparing the simulation output to high speed video of actual tippe tops in action.

Blender tippe top animation displays motion at 1/33 real time. The location – rotation keyframes were generated by a 6dof tippe top simulation coded in Python. This simulation includes: Full 6dof equations of motion. Stem contact dynamics. Modified Coulomb friction. Coefficient of...

The purpose of the experiment was partly historical, I was curious to see if I could measure the fair weather E-field using my gold leaf electroscope. Abraham Bennet did this experiment back in 1788, only he used a lantern flame for the ionization probe. Yes a field mill or field meter is a...

The humidity was about 30%. This is the first time I got this experiment to work after about eight failed attempts. I found the cause of these failures to be poor insulation of the pie tin and the insulation of the wire from the pie tin to the electroscope. I ended up having to suspend this...

Fishing for atmospheric electricity.Three microcuries of Am-241 were placed in a aluminum pie tin. The pie tin was then suspended 2.7 meters in the air by a fishing pole. The pie tin was insulated from ground by the nylon fishing line. A wire connection was hung from the pie tin to the top...

The top two figures that look like fireworks are from positive discharges and the bottom five are from negative discharges. An aluminum cigar tube was placed open end down on the plastic and a charged pie tin was brought near the cigar tube until a spark discharge occurred. The cigar tube was...

Here is a frame from the expansion cloud chamber movie that I think shows a collision and/or decay. The range and ionization of the two collision/decay products seem consistent with the alpha particle energy from the radium paint coated pin. However I don't see the alpha particle track leading...

Here is a version without sound: https://www.youtube.com/watch?v=dbLowL_jIs0

Are you in Germany? Russ

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