Propellantless space propulsion is possible and available.



Few proposals generate stronger resistance among the experts than propellantless propulsion, any idea is quickly (and generally deservedly so) rejected out of hand for the disregard of basic science (generally the law of linear momentum) or the fact that here is no clear experimental demonstration.


So the first thing I am going to show is a simple DIY in your living room experiment that demonstrates the propulsion effect of the Fluid Space Drive (Version 0).



Acknowledging that most persons are not inclined to dedicate time and money on an activity they are positive will fail, we present a series of simple “living room experiments” that can be set up using simple materials in a classroom, workshop or dining room yet will generate sufficient thrust so the effect is clearly visible to the naked eye.



Ideal for the measurements of weak forces is a Torsion Balancing Pendulum, all that is needed is:


A balanced beam.

A strong string.

An airtight box to put the mechanism to be tested.

A counterweight.

A motorized propeller(s) on a pedestal

R/C unit to turn propellers on/off (optional)



Set up the balanced beam and wait until the system is at rest.



When the mechanism to be tested (in this case a motorized propeller on a pedestal) is placed inside the box and turned on, if a force is generated the box will accelerate (rotate).




To be confident that the effect in not caused by vibration it is appropriate that the test be repeated in the opposite direction, with and without propellers (only vibration is left), with counter rotating propeller and replacing the propeller with a flywheel.



Description of the torsion balancing horizontal pendulum apparatus


Although it is possible to construct a balancing horizontal pendulum just by hanging a broom from the roof (see here) we recommend you take the time to construct a more rugged test apparatus with some aluminum beams (or just have fun an go with the broomstick hanging from the roof, but please see description of the box)





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Aluminum angle


We simply use two 3 meter aluminum angle or beams connected by four 1 meter beams to construct a frame.


Ideally we hang the frame from the roof


If it is not possible to hang from roof it may be balanced on a pedestal (see here)


Description of the test box.

Although we have seen a simple cardboard test box can be used (see here) we recommend the following design for consistent results that can be compared with ours (if you desire)





We need:

Two 1 by 2 meters Styrofoam sheets.

A few cardboard paper sheets.

Duct tape.




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Styrofoam sheet


1-Cut half a circle (50 cm radius) on both ends of the Styrofoam sheets

2-Use one Styrofoam sheet as the bottom of the box and one for the top

3-Use cardboard paper sheets for the sides hold together with Duct tape


4- Cut an orifice in the top Styrofoam sheet so as to change position of motorized propeller(s) on the pedestal assembly


Motorized propeller(s) on a pedestal assembly



Construct a base (not fixed to the box’s bottom so it can be moved for optimal efficiency), include battery and R/C control (optional) see details of the propeller construction here (fig 3).




Keeping it simple.

The illustration shows two counter rotating propellers, it is not indispensible as it works with one propeller.

The R/C control is also optional




So what can we expect? (Results)

Video of 2.18 cubic meter box balanced on a pedestal.


The box will push itself with no difficulty whatsoever at speeds of 0.2 cm/second to 2.4 cm/second depending on the position the propellers are placed inside the box. (0.58 cm/second when the propellers are positioned at the inner center point of the box)

When the propellers were places OUTSIDE the box (position on the box’s top) the rotation is 4.34 cm/second.


So how/why does this thing work again?



The velocity of the box can be calculated by drawing a circle (or sector of circle) with a radius equal to the distance from the pendulum’s rotational axis to position of box.

Place makers (or sensors) every 10 cm on the circle’s circumference and register time box passes marker or sensor.

A very adequate test setup can be made by using Arduino microcontroller and laser sensors, but as this page is to describe a quick, low cost living room experiment you can time the intervals with your smartphone timer.


Regarding the propeller’s rpm there is a “sweet spot”, too slow and there is little rotation, too much and the box goes nowhere, we recommend 600 rpm for easy results. (Not necessary the most effective)



Pendulum test



The box (the 2.18 cubic meter box described here was used) was hung from an altitude of 2.2 meters.

The box has a mass of 4.5 kilos.

When the propeller was turned on the box moves and maintains a distance of 3 mm

That gives us an angle of 0.0781 degrees.


Calculating useful force


If the pendulum is positioned at an angle of 0.0781 degrees, using the simple pendulum equation we see that when the pendulum’s (box) velocity at the bottom of the swing is 0.000632 mps.

As the box has a mass of 4.5 kilos we can calculate a force of 28.4 millinewtons.



28.4 millinewtons is equivalent the power generated by today’s low end Ion thruster, they presently range from 28 to 250 millinewtons.

But we must remember that Ion thrusters are a mature technology, by that I mean that thousands and thousands of research and engineering hours have been invested, as has been billions of dollars.

The Fluid Space Drive is optioning similar results using only a few dollars of materials.

Also as the Fluid Space Drive does NOT expel any type of mass (no even ions) it can continue acceleration for as long as a power source is available propelling spacecraft further an faster than ever before.




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