......my bellyboard turns down to about 80 deg. and after talking to some
aerodynamicists and some practical trials I decided to let the board without
holes.
The tests I made are very simple.I took a foamsheet ( 1 meter x 1 meter x 5
mm) ,fixed 5 strings to the edges and the center with a weight (about 100
grams ) and used my "parachute" as testdummy.
I dropped the dummy from my ten meter high rooftop (5 trials without holes
and 5 trials with holes) and compared the times I measured.
It was easy to recognice that the board without holes always gone down slower !
There was a big difference how they sank down.The board without holes tumbled
much more than the Board with the holes (due to the holes,of course)
Happy New Year again,Herbert,
German Kr Bilder
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