Question 1/10

Score 0 / 10 0%

A pre-flight check should be executed...

...before take-off. ...after every flight. ...every six months or as often as the manufacturer recommends. ...only by your instructor.

Before you take off, you should check at least these things: pilot, lines, canopy, wind, airspace.

What do you do when you can't hear the instructor over the radio during a flight?

You throw your reserve parachute. It is much too dangerous to keep on flying. You keep course to the landing field. Close to the landing field you spread your legs to indicate to the instructor that something is wrong. He or she will then give instructions via signs. Don't forget to keep thinking for yourself as well and make sure you land safely on your feet in open space. You turn around and fly back to the take-off to try and notify the instructor there, so he or she can give directions. You do nothing. The paraglider will touch down sooner or later by itself.

B is correct, A and C are nonsense of course.

Answer D is the second best choice in case your mind goes blank, you panic and you don't know what to do. It's better to do nothing in that case.

Which data do you need to calculate the wing load?

The weight of the wing, the flat surface of the wing and the weight of the harness. The take-off weight and the flat surface of the wing. The span, the flat surface and the weight of the wing. The aspect ratio and the take-off weight.

The wing load is defined as the weight on the wing per square metre. Therefore you need the total take-off weight and the flat surface of the wing to calculate it. For example, a 25m² glider flown by a pilot with a TOW of 100kg has a wing load of 4kg/m².

How tight does the chest strap of the harness need to be?

As tight as possible, so you can't fall out of the harness and you will be stable in your harness in a turn. There needs to be 42-46 cm between the karabiners, about the length of your arm from elbow to fist. Most paragliders are designed and tested with the chest strap of the harness at that width. It doesn't matter, as long as the buckles are secure. It doesn't matter. The chest strap is only needed during take-off, but you may as well leave it open as you are secured in the harness by your leg straps.

A short distance beween the karabiners results in a stable flight but enhances the risk of twisting, for example after a collapse.

A large distance between the karabiners results in a higher sensitivity to weight shift but also to more dynamic reactions of the paraglider.

We lay out the canopy in a semi-circle before take-off. Why?

This reduces the tendency of the lines to tangle. This ensures that the canopy will fill from the middle cells towards the tips. This ensures that the outer cells will fill with air first. This is the only way you can separate the brake lines from the main lines properly.

When the center cells fill first, the canopy will rise steadily and straight.

Why are the cell openings slightly pointed down?

To increase the aerodynamic properties of the paraglider. Because the airflow is coming from the front and below at an angle. To enable dirt or dust to fall out easily. To achieve a venturi effect.

The cell openings are positioned where the air flow hits the profile of the airfoil.

It's sunny on launch and you're ready to take off, but the wind has been from the back for quite a while. What do you do?

Stay there and be ready to go. Parawaiting is part of the sport and it's not uncomfortable in the sun. Hold on to the brakes and risers but sit down on your harness. The reserve parachute under your seat is a comfortable seat. When the wind turns you're well rested and ready to go. You disconnect the wing from the harness and pack up the glider. The vulnerable material suffers from the sun. As soon as the wind turns you unpack and get ready again. You bundle up the glider in a 'field pack', take off the harness and lay your equipment in the shade. That way, the materials aren't damaged, you can rest a bit and you will be ready quickly when the wind turns.

Gliders suffer the most from direct sunlight. The airtight coating is damaged by the UV-radiation. Don't leave your glider out in the sun unnecessarily.
Additionally, sitting on the reserve parachute may damage it without you noticing, so it might fail if you ever need it. Never sit on your harness.

What happens when you brake a paraglider so much that the air speed falls below the minimum speed of about 25km/h?

The glider stalls, ie it doesn't fly anymore. The glider will fly on as slow as you want. The glider collapses.

The photo shows what happens when you pull so much brake that the air speed of the paraglider falls below its minimum speed. The glider stalls. Therefore we sometimes call the minimum speed of a paraglider the stall speed.

Don't do this while flying! Unless you are on an SIV- or acrocourse.

Older gliders can also enter a deep stall when you brake too much - see the chapter on Aerodynamics.

Which pre-launch check is the most important?

Checking the lines and canopy are laid out cleanly. Checking your flight instruments. Checking your leg straps are fastened. Checking if there is sufficient thermal activity.

Even though all newer harnesses have a safety feature to prevent you from falling out of the harness if you forget your leg straps, this is very uncomfortable and on an older harness it may be a fatal mistake. Checking lines and canopy is of course very important as well.
See the section on Launching in the Basic techniques chapter.

A paraglider glides down through the air. But at what speed?

The forward speed is over 50 km/h and the sink rate around 10 km/h. The forward speed is over 50 km/h and the sink rate around 1 m/s. The forward speed is around 35-40 km/h and the sink rate around 1 m/s. The forward speed is around 35-40 km/h and the sink rate around 0,1 m/s.

These are all speeds relative to the air!

Your result is shown above.

Did you like our quiz?
Share your result with your friends using the buttons below.