EHD Thruster Collection

Engineer Xavier Borg - Blaze Labs Research

Modified pressure EHD thruster - designed 19/06/02


Modified pressure EHD thruster. The thrust in our EHD thrusters is given by:

F=id/k, but k=ko*(273+t)/273p ... where p and t are the air pressure and temperature.

This gives: F= 273p.i.d/(ko(273+t))

If we do not change temperature, the new thrust F' will be :

F' = nF
where
F = normal thrust at ambient pressure
n = ratio of new pressure to old pressure

This explains why people trying out their thrusters near sea levels get much more lift than those living at high altitudes. So, the trick is to supply air at high pressure to the EHD thruster, by say an external propeller/ wind turbine/ etc..

A 10 bar air supply will make the thruster 10 times more powerful than the same thruster at 1 bar. At that point, the current power supply weight to power ratios will not be anymore of a problem!

The above picture shows the first thruster design implementing this idea. It is basically a 15" propeller driven at high speeds by a small dc motor, mounted over the low profile panel thruster.

After correcting for the weight of the dc motor and propeller, it was calculated that the thrust improvement of the above setup had in fact increased by a few grammes. As explained above, the thrust improvement depends on the ratio between normal ambient pressure and that of the mechanism generating the external pressure. This idea can also be implemented as a jet booster, where high pressure air from the output of a turbine is passed through the thruster elements to form a RAM thruster, as excellently designed by Devlin Baker. As you see, this design also utilises the heated cathode concept, as described in Experiment 7, in my Experiments section.


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