دوشنبه 17 آذر 1393
نویسنده: parapink5 learning training paragliding |
The collapse of one side of our wing is a common problem when
we fly in thermals. Most collapses can be avoided provided the pilot is careful
in his actions. Strictly speaking, when you have a collapse you have made a
mistake just previously.
In flight an asymmetric collapse occurs when we are flying with too little brakes or when we are entering or exiting a thermal with strong associated turbulence. This is a common occurrence and can be progressively from small-scale to large-scale maneuvers.
Hold the left brake and apply normal pressure on the wing. Keep the right brake
handle in your hand, reach up and pull down on two lines from the A riser with
the right hand until a part of the right side folds under. The wing will want to
turn right, as this side will be creating more drag. To prevent this right turn,
apply a little more left brake and shift your weight to the left.
Caution: Do not let the glider turn and do not apply too much left brake which can stall that side use weight shift steering.
In flight, some advanced wings would behave better if the pilot let them turn and then try to recover.
To reinflate the collapsed side, let up on the lines and pull
down the right brake with one controlled movement. Tentative "pumping" is not
really effective for making a normal recovery. Some paragliders can recover
without pilot input.
For a bigger collapse, pull down the right riser. The wing will tend to turn since the part of the wing which remains inflated bears all the pilot's weight. To deal with this, pull down on the left brake and shift your weight left to prevent turning too much, release the riser and then pull down on the right brake. Let the wing turn a little towards the deflated side and this will enable faster recovery. Do not apply too much opposite brake because this can cause deflation of the open side. Remember to handle your wing with smooth and controlled movements, which are the result of practice.
• Tangling of the folded side with lines is possible,
especially when there are only a few of them. If you cannot disentangle it, fold
the other side and head for landing.
• If you do not brake the speed of the inflated side, you may enter a spin. Inversely, if you brake too much you will enter a stall.
• The right technique is acquired with experience. A general rule is composed and confident movement. There is no need to be afraid, but be aware that asymmetric folds involve altitude loss.
This collapse is caused by turbulence and can be a result of a one side collapse. Also a front collapse can produce a one side collapse. In flight, the wake turbulence from other paragliders flying near can produce a front collapse.
A pilot can cause a front collapse by pulling down the A risers. It is safe for the brake handles to fall down around your wrists if this feels more comfortable than when they are in their normal position. Of course, the maneuver should be carried out gradually by tugging slightly on the A risers, noting the resistance and gradually increasing the pull. The wing will fold at the front and lose its shape due to stall, and a forward horseshoe will probably be produced. Altitude will be lost after a pitch oscillation of the wing.
To recover normal flight, pull on both brakes symmetrically. Some times the front collapse is not symmetrical and the one side might require less or more braking.
• Pilots using trims should be extra careful. Due to the
oscillation caused when recovery is made, the trim may open automatically. One
sided or asymmetrical trim opening can occur during other maneuvers as well. My
opinion is that trims should have some Velcro security system.
• In areas of turbulence, apply brakes actively to prevent a collapse and to feel the wing better. In a state of repeated collapses, do not rush to correct or the wing will fold again.
This is a symmetrical collapse of the central front part of the paraglider. The center stops flying due to deflation and the sides meet in the center of the wing.
While holding the brakes, grasp the one inboard line from each A riser and pull them down slowly to your chest. This may not be enough so you may have to pull the lines a little more. Make sure you pull down symmetrically. Both sides of the wing will maintain a forward direction while the center will slow down, so there will be a central collapse. Loss of altitude (5 to 7 m/s or 1000 to 1400 FPM descent rate) will occur so keep a safe distance from the ground. Several designs of paraglider will not perform or resist to perform this maneuver.
Gradual letting up on the risers and applying the brakes slightly produces recovery. Be gentle to protect your wing from wear and tear when recovering.