Air Creation iFun XL Manuel d'utilisation du pilote - Page 14

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and low cruise speed adjustment, it may be necessary to increase the speed before the

wing is put into banking to avoid stalling the lower wing. An increase in engine power is

also advised to maintain the flight level during the turn.

talling:

The stalling point is reached more easily with a backward hang point position. Once the

stall angle of attack is reached, the control bar starts pushing back forcefully and some

pre-stall buffet may be felt in the form of pressure bumps. Avoiding any resistance to this

tendency for a short while allows the wing to return to correct speed. In that case, the loss

of altitude will be less than 10 m. (33 ft). If the control bar remains extended despite the

warning signs, the wing will stall and the loss of altitude may easily reach 30 m (100 ft).

An asymmetrical start on one wing is possible, particularly during the running in of the

sail (first 50 flying hours).

Nose high pitch attitudes generated prior to the stall break will lead to high nose down

rotation rates. In common with all flexwing aircraft, extreme examples of this can result

in tumbling motions, loss of control and massive structural failure.

To avoid risk of tumbling, stalling exercises must imperatively be carried out with the

engine at idle, with a very slow decrease in speed (less than 1kt/sec) obtained by

progressively pushing the control bar out.

No rolling action shall be taken when

approaching the stall. The push action on the control bar must be released as soon

as the first warning signs are evident (flutter of the sail, vibrations of the control bar,

mush or beginning of a break).

The stall obtained during a turn by an insufficient speed and an excessive pushing action

on the control bar will cause a tilting of the inner wing in the direction of the turn and the

nose towards the ground. If the pressure on the control bar is then released so as to bring

the angle of attack back into the normal flight range, the bank angle will be reduced by a

conventional maneuver. But if the bar is kept pushed after the wing tilts, the rotation will

not be stopped by a simple rolling action and the machine will be able to engage a

descending spiral. To summarize : In the event of a stall in turn, first make the wing fly

again by reducing the angle of attack, then correct the bank !

Pilots should also be aware that as with all aircraft, overloading with baggage/heavy

occupants will increase stalling speed, as well as the usual drawbacks of reduced

performance, maneuverability and structural safety margins.

Behavior in strong wind:

Once grounded and motionless

Park the aircraft perpendicular to the direction of the wind, with its windward wing

lowered and the tip of the leading edge rests on the ground, block the A frame on the

front tube of the trike (using for example the Velcro used for packing the battens of the

sail), block the park brake and put chocks under all three wheels. Take the wing off the

trike and put it flat on the ground windward, if the aircraft is not going to be used

immediately.

GDMUiFXL-evo-1G

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