Electrostatic stabilization system for UAV
Posted 30 April 2005 - 09:11 AM
Has anyone more info about it?
Posted 30 April 2005 - 12:49 PM
Posted 01 May 2005 - 12:02 PM
Posted 06 May 2005 - 11:15 AM
Hans Delemarre, the Netherlands
Edited by Delcam, 06 May 2005 - 11:29 AM.
Posted 13 May 2005 - 09:48 PM
I can't get the PM to work for me. Is there a chance you can make that file available to me as well? I would greatly appreciate it. Thanks
Edited by kd7ost, 13 May 2005 - 09:49 PM.
Posted 14 May 2005 - 03:06 AM
The file is big (21Mb) and will only be on the site for a limited time, so be quick !
Edited by Terry, 14 May 2005 - 03:06 AM.
Posted 14 May 2005 - 09:41 AM
Download is complete and articles are great.
I wonder if anyone has continued doing any research? The one problem I see right off with doing this today is getting ones hands on 250 to 500 micro curie Palonium radioisotopes. Or would one even want to? The article from then says they are safe. Would they be by todays standards? (Hmmm, where does one purchase hobby grade radioactive material and a lead vest?)
It would seem however, that gain in op amps have improved dramaticaly over the years since the research was first done. There may be other sensor type devices that could do the same type of electrical amplification. But that is pretty well beyond me to figure out. Perhaps high impedance CMOS amps with a high input impedance may not need the added amplification of the Palonium sensors.
Any idea's anyone?
Posted 14 May 2005 - 11:18 AM
Why are the Palonium radioisotopes needed ? Could you make use of a smoke detedtor that uses this method ?
How exactly are the sensors made ?
Posted 14 May 2005 - 01:06 PM
"Thirty-two years ago, scientists discovered that tobacco contains high concentrations of radioactive material. The radioactive nuclide that tobacco contains is polonium-210. Polonium-210 is an alpha emitter, the most highly ionizing radiation known to mankind, and particularly dangerous when in contact with living tissue."
Posted 14 May 2005 - 03:54 PM
I'm assuming that just putting wires out won't do it. There needs to be some form of detector out there. Something that actually develops a potential from the atmosphere and converts it to a measurable DC level for the op amp.
I don't quite see how the pulses would feed into the circuit or come back out being varied. I don't know the vintage of servo they are using. Are they using the error voltage to the feed back pot of the servos used for positioning that servo?
Edited by kd7ost, 14 May 2005 - 04:00 PM.
Posted 14 May 2005 - 04:42 PM
The caption for the schematic in the American Aircraft Modeler states, "A circuit suited for model planes and sport flyers will be seen in a later issue".
Anybody got access to that?
Posted 14 May 2005 - 05:55 PM
Kraft's old Series 72 servo was essentially the same as what is used today. That is, it had an IC servo amp IC that did all the work. The analog signal from Maynard's device was connected to the servo IC at pin-3, which is part of its one-shot reference generator. Full details to the servo can be found here:
It used a variable cap for feedback instead of the variable pot. (Fun facts to know and tell I guess) I don't know if it used a standard pulse to operate though. It was from an early Kraft digital RC system.
But, because of the warning in the article about protecting the servo from stalling (plastic gear breaker!), the real solution is to use a microcontroller to do all the work. That would eliminate modifying the servo too. That part sounds pretty easy to me - Just add a PIC and some firmware.
The article states that the radioactive source came from a store bought record cleaning brush. I used these all the time back when turntables were king. With luck, cheap home-use versions are still available (hard to say, with all the environmental related consumer laws in place). From what I can tell, all you need to do is attach a wire to it.
Here is a professional photographer's brush that uses the radioactive source: http://www.halfhill.com/dust1.html. It looks just like what I used to clean LP's. The Holy Grail is found here: http://www.amstat.co...aticmaster.html. The 500 microcuries ionizer component, which is pretty much what Maynard used, is expensive though -- $35 each. Measurement labs install these near their weight balances. They are replaced annually, so maybe someone can dig up some used ones for free.
Edited by Mr.RC-Cam, 14 May 2005 - 07:18 PM.
Posted 14 May 2005 - 07:21 PM
Posted 14 May 2005 - 07:56 PM
Posted 15 May 2005 - 04:02 AM
Wile Maynard's electrostatic wing lever worked great under ideal conditions you need to follow up on what would happen if a thunder storm rolled in wile the aircraft was flying, I vaguely remember reading about how the electrostatic field of the earth would reverse causing the aircraft to roll inverted.
If I remember correctly this is one of the reasons that it was never put into production for the common RC flyer.
Posted 15 May 2005 - 09:11 AM
It would be nice to re-evaluate the system to see if this was true, although I dont fly in thunderstorms anyway
Posted 15 May 2005 - 09:57 AM
I also want to fly a GPS guided glider to a landing spot after having lofted it under a weather balloon to in excess of 75,000 feet MSL. I don't think the co-pilot will work after having been cal'd on the ground, then lofted to where the temperature is -60 f. An Electrostatic stabilization system just might be the ticket. Of course the article also alludes to the voltage potential diminishing as altitude increases away from the earths surface. So who knows, it might not work up there either.
Posted 20 May 2005 - 11:44 AM
better late than never..... I only saw your posting today! Perfect idea to "publish" the articles in this way. Thanks.
Posted 20 May 2005 - 12:37 PM
Here the web
And here the PDF file
Edited by elossam, 20 May 2005 - 12:38 PM.
Posted 22 May 2005 - 08:28 AM
Was he sucessfull ?