On this episode of MyGeekShow I tried to see how high I could fly my RC Airplane: my Multiplex Easy Star.
The higher I flew the more difficult it was to see which direction the airplane was heading, so I tried adding streamers to increase visibility, which helped a little.
I eventually was able to fly over 1,000 feet!
I use this: http://www.wingedshadow.com/howhigh.html and this: http://www.wingedshadow.com/seehow.html for the altitude measurement.
**SAFETY NOTE**
Be VERY careful flying this high up, not only is it hard to control your airplane when its so hard to see, you are also getting closer to the airspace shared by full sized aircraft. Take the proper safety precautions when attempting these kind of things, which may include making a NOTAM, working with the local ATC, etc. BE CAREFUL!