Dudek Nemo 4 Passion 매뉴얼 - 페이지 15

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Influence of the brakes on airfoil effectiveness

when accelerated

Pilots used to classic canopies without trimmers tend

to fly "actively", with steering lines constantly under

tension. Such piloting of a canopy with released

trimmers is totally ineffective and can even be

dangerous.

Basic rule when flying both accelerated and on

released trimmers says: steering must be smooth,

with no aggressive inputs, using no more than 25%

of the total steering range.

In case of encountering massive turbulence we

advise to close the trimmers completely and take

active control of the canopy via steering lines.

See following drawings.

influence of the brakes on airfoil

Released trimmers without brakes operation

Fast flying setting.

Due to partial modification of the aerofoil with

dedicated riser system, centre of pressure of the

aerofoil is moved forward.

Released trimmers with brakes applied

Even slight brake operation (especially when fully

accelerated) will move centre of pressure backwards,

and the torque will decrease the angle of attack.

Additionally, the airflow is considerably disturbed. In

particular cases this can cause a collapse. Steering

lines operation may be necessary for corrections of

the heading, nevertheless when flying straight line

steering handles should be fully released. Otherwise

they will alter the equilibrium of the aerodynamic

forces affecting the profile.

Closed trimmers

Operating the brakes is in this configuration a typical

steering mode and does not cause any danger. Such

setting is used during launch, landing and thermalling.

The canopy is configured exactly as during the EN

tests.

lift

pitching moment

speed

center of pressure

sink