Mechanics of Fibrous Materials
Resistive Force ¨C body drag
Little is known about the magnitude of the wave drag relative to the other drag components
Balance between skin friction and head resistance depends upon Reynolds number (NR=¦Ñva/¦Ç)
NR < 2000 Skin friction dominant
NR > 2000 Head resistance dominant
Resistive Force ¨C Human being
NR >> 2000 head resistance dominant
Experimental confirmed this theoretical prediction.
Decrease skin friction contribute relatively small to the reduction of resistive drag force.
Mechanism of SPEEDO Fastskin
Mimics the sharkskin with drag-reducing grooves.
Reduce drag by channeling the water along grooves in the fabric.
These grooves allow the water to spiral in microscopic vortices.
Fastskin passive drag values were significantly less than normal swimsuits.
Please view the
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