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Author Topic: Parafoil from China.  (Read 974 times)
0 Members and 1 Guest are viewing this topic.
Trade Count: (+20)
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Posts: 738

Location: Willunga, South Australia

« Reply #15 on: Yesterday at 05:19 PM »

I question if you dont start modding the sail shape itself along with the bridle

I suspect the airfoil profile is the problem.  Bobbing will occur if there is irregular airflow over the rear of the top surface.  When there is low air pressure above it, that part of the wing rises.  But if the momentum of that rising motion lifts that part of the wing too high, there is no longer a low pressure area above that section of the wing, so it drops.

Repeat as above!

A larger version won't bob as much - the mass of air inside the parafoil is more difficult to shift up and down in such a hurry.

A long fuzzy tail will damp down the oscillations.  This is a bit like trying to flick a length of rope back and forth- easy to do with a short rope, more effort required with a long rope

Kevin Sanders

Willunga, South Australia
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