Air Creation iFun XL Betriebshandbuch für Piloten - Seite 15

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Ground-runs

Keep the sail flat into a headwind. Push the control bar against the trike front strut with a

tailwind. This will avoid flipping. With a side wind, be careful to always tilt the wing so

that the windward edge is slightly lower than the rest of the wing. It may be difficult to

hold the A-frame in its position. Never let the wind lift the wing up.

Take-off and landing

As ground run distances are considerably reduced by strong wind, try to face the wind.

Perform take-off and landing maneuvers at greater speed than you would normally do, in

order to diminish the drift angle and counter the effects of the gradient.

Crosswind Take-off

Start the take-off run with the windward wing very slightly lowered. Hold the aircraft on

the ground by holding the bar slightly back from the neutral position. Keep to the axis of

the runway with the front wheel control without considering efforts on the sail. Allow

airspeed to build to a higher-than-normal value then rotate positively into a shallow climb

attitude. Keep the wings level and allow the trike to yaw into the relative wind. At this

point adjust the drift angle if required to maintain runway centerline, and proceed as

normal.

Crosswind Landing

Crosswind landing limits are largely dictated by the skill of the pilot. Make sure that you

have lots of experience before attempting crosswind landings with components in excess

of 8kt.

General technique should be to fly the approach maintaining the runway centerline by

setting up a steady drift angle. During the final stages of the approach use a higher-than-

normal approach speed to minimize the drift angle. Round out slightly lower than normal

and aim for a short hold off, so that the aircraft lands smoothly, back wheels first with the

control bar at or only slightly forward of the neutral position. The contact between the

back wheels and the ground will then yaw the trike unit towards the runway centerline at

which point the nose wheel can be gently lowered to the ground. Once all wheels are

down the windward wing can be lowered slightly. To ensure maximum directional

control during rollout from a crosswind landing the recommended technique is to move

the bar back after landing and apply light to moderate braking. This eliminates any

tendency to bounce and ensures good contact pressure between tire and runway surface.

This technique of applying aerodynamic loading to increase ground pressure and hence

braking efficiency during landing roll is also appropriate for short field landing.

Remember that crosswind landings on grass are slightly easier than on hard surfaces.

During crosswind landings a lot of torque is carried through the structure which results in

excessive wear to the hang point and attached structure. Always try to land into the wind

if possible. If crosswind components are in excess of 15 knots then only a small

windward distance will be required for landing – across a large runway could be the best

option!

GDMUiFXL-evo-1G

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