I remember that article. I think you could also use the source from an
ionizing type of smoke detector. This is what made the system function. You
are correct. Without a radioactive source it would not work. I forget if it
was in Flying Models or Model Airplane News. I think it was Flying Models.


At 06:10 AM 12/7/97 -0600, you wrote:
>>
>
>About 20 years ago  a man by the name of Maynard Hill for worked for NASA at
>Ames research center,  I believe, came up with a very simple auto pilot for
>RC planes.  I have the details on this. If any one wants further info on
>this please feel free to contact me. I built and tested on of these and it
>worked fantastic.   The down side of this is he used  a small RADIO ACTIVE
>PARTICLE on the sensor.  You used to be able to buy these in any record
>shop. They were attached to little brushes for removing the dust from
>records.
>With out these I doubt the system would work.
>
>Bob Nelson
>
>rinelson@tcccom.net
>
>
Larry G. Nelson Sr.
mailto:L.Nelson@ieee.org
http://www.ultranet.com/~nr