Poynting Flow Thruster

Wed, 8 Nov 1999
The Poynting Flow Thruster project is originating from Jean-Louis Naudins intresting experiments. If these theories and experiments is valid (I have not tested it yet, will do so very soon), then I have some enhancement theories.

The orginal theory is that if we charge an asymetrically wired capacitor it will generate a force pointing from the wire junction to the center of the capacitor. It does'nt matter if the charge is positive or negative, the force will still point in the same direction.

Then if the capacitor is discharged the force will point in the opposite direction. This is not really useful, since we want an continious force in one direction. This can be solved by adding junctions on the opposite side on the capacitor:

Press switch 1 to charge the capacitor, then release it.
Press switch 2 to discharge the capacitor, then release it.

Both these will generate a force in the same direction. Which is what we wanted, but unfortunatley it will generate lots of unwanted heat excess and high power consumption. If we instead feed it with a sinusodial voltage, and rearrange the switches a bit:

When the sinus voltage is on the zero point then use switch config 1 and charge the capacitor.
When the sinus voltage is on ither top or bottom use switch config 2 and discharge the capacitor.

This configuration does not generate any power losses at all (except for those in the sinus generator), only current flow. There is yet another trick to get rid of the current flow aswell. By adding an inductor in parallel with the sinus voltage generator:

This will make it an LC filter with a resonance frequency of f = 1 / (2 * pi * sqrt(L * C)). Matching the input frequency by the resonance frequency will result in no current flow. Viola!
Even make the inductor to a high voltage transformer to power it by a low voltage sinus wave.

I don't yet have a complete idea how to, in the simplest way, make the switches. Using transistors in a triacs configuration maybe. If you have any suggestion, or if you have any testresults to share, then don't hesitate to email me. I would like to know.
Wed, 10 Nov 1999
The preliminary test of the Poynting Flow Thruster project is unfortunatley negative. By using a CD cover and place a aluminium cheet on each side, and have the junktions in one corner. These are connected to a monitors high voltage (27.5kV) CRT and ground.
When the power is switched on there is a force moving the capacitor from the junctions towards the center of the capacitor, but the force is continuos even when the capacitor is fully charged. Thus it is probably due to the ionic wind effect. I have to do more experiments though. I will try to make a low voltage capacitor using a high dielectric medium instead to avoid the effects of ionic wind.
Sat, 1 Dec 2001
Ok, now I have found a way to load the capacitor in one place, and discharge in another. See the following schema:

The diods D1-D4 does not need to be high voltage types. The transistor Q1 needs to handle the double input voltage. This is a resonant LC coupling, and the frequency can be calculated as above. The Pulse input should match this frequency, 100kHz in this example. Let the pulse width be 5-10% of a whole cycle. I will do some test on this soon. I've just built the capacitor and now I need to build some holder.
Some futher enhancement can be done by driving the inductor from a third outlet, and let the transistor work in lower voltage. The inductor will then work as a transformer, and step up the resulting resonant voltage.

Sidenote: The schema is made with Tgif and Gimp.

© Daniel Ryde