GDMUBI15-1G
Version 0030
18
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!
Flight in Turbulence:
Compared to other flexwing microlights, the BioniX handles turbulence very well.
However in common with all microlight aircraft, care must be taken in turbulent
conditions, particularly when close to the ground. As previously stated high airspeed will
enhance maneuverability in these situations. However if conditions become severely
turbulent with hard jolts being transmitted through the aircraft, it is recommended that
you do not exceed the maneuvering speed Vman. VNE should only be reached in smooth
conditions.
In strong wind conditions, avoid flying on the downwind side of large hills or other
obstructions. When landing in strong crosswind conditions, remember that low-level
turbulence will be produced by obstructions on the upwind side of the runway. Always try
to assess areas of possible lift, sink or turbulence from some distance away so that you
can be fully prepared for their effects.