Flying With A Wet Paraglider ( Risk Of Deep Stall ); Winching; Tandem Flying - Advance acoustic ALPHA 7 Manual

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Flying with a wet paraglider ( risk of deep stall )

Flying with a wet glider creates a risk of deep stall . Deep stall is often

the result of a combination of factors . The weight of the wet canopy

goes up, and this increased weight increases the angle of attack,

which always puts the glider nearer the deep stall limit . Added to this,

water drops on the top surface have a detrimental effect on the laminar

flow of the boundary layer near the leading edge, which distinctly re-

duces the maximum lift coefficient . If the wet glider is also being flown

at its lower weight limit there is a further small effect of increasing the

angle of attack, as well as there being a lower airspeed because of the

reduced wing loading .

In order to avoid the risk of deep stall with a wet glider, the wing should

be braked as little as possible, and big ears not used at all . As a further

preventative measure apply moderate ( 25-40% ) speed bar . These

actions have a small effect in reducing the angle of attack . If the wet

glider does go into deep stall you should recover by using the speed

bar only . See also section «Deep stall» .

The ALPHA 7 is suitable for winch launching . When taking off in wind-

less conditions, ensure that the paraglider is laid out in banana or

even wedge shape to make sure the centre inflates before the wingtips

( avoid risk of rosetting ) .

Winch launch is only permitted if:

the pilot has completed a tow training course ( ( only Germany/DHV );

the winch system is certified for use with paragliders;

the winch operator has been fully trained in how to winch

paragliders .

The ALPHA 7 is not certified for tandem flying .

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