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LowRoll1

Here is the model named "BlueBlue" flying low across the plateau and over the lip doing a roll. The plateau is the "back side" of the slope in this case, where turbulence and wind shifts are common. In this video, however, there is little or no wind on the back side and only 5 mph (~2 meters/second) or so of wind blowing up the slope from the left of the picture. The approach is fairly low speed. As the roll is started the model transitions the shear boundary into the headwind, giving it a jump in airspeed. Good airspeed allows the roll to be completed fairly quickly without the height loss typical of a roll at low speed. The headwind keeps the ground speed, or speed relative to the camera, very low, which gives a magical hanging effect as the model seems to float and roll while hardly moving forward. The motion is in real time. The elevon flashes because it is covered with metallized mylar. Camera work and model by Clark.

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