WINDTECH EVO 23, Руководство по эксплуатации самолета

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The simplest form of descent. To do this, simply pull on the big-ears line one at a time
by taking hold of the plastic balls at the end the
EVO
´s big-ears cleat-ing system (first
making sure that the line is released from the cleat), then pulling them down all the way,
one at a time. Both of the cleats face in one direction, to make it easier to induce the
big-ears with just one hand, and keeping the throttle hand free. Once the big ear has
been induced on that side, you can lock it in by pulling the cleat line in an outward-and-
upward direction, so that it locks into the grooves of the clam cleat. To release the big
ear, pull the cleat line in an outward-and-downward movement to free the line from the
cleat grooves of the cleat and then allow the line to slip back through the cleat and, in
so doing, freeing the big ears. The big ears should re-open autonomously but, if not, then
these can cleared by giving a pump on the brake on the side that has not cleared, being
careful to do this one side at a time and not to stall the wing by over-braking.
The sink rate achieved from pulling big-ears is around 3–5 m/s. This manoeuvre is rec-
ommended close to the ground, as it allows the pilot to keep the big-ears in even until
on the ground (although of course the pilot needs be aware of the higher descent rate,
and possible hard landing that may result), whilst leaving the pilot’s hands free to steer
the glider. If one combines the big-ears with the trimmers (and possibly the accelerator
as well), one gets a very good descent rate whilst keeping an acceptable speed.
-- spiral dive
SET TRIMMERS TO NEUTRAL POSITION
The Spiral Dive is obtained by maintaining the glider in a steep turn. Little by little (the
speed at which the spiral is entered depends greatly on how much brake is induced and
also wing loading) the glider will accelerate into the spiral, especially if one aids this with
weight-shift. Once the turn has converted into a spiral dive the pilot can control the
speed of rotation and descent with small changes of interior and exterior brake, and
more or less weight shift. It is possible to achieve descent rates of 10-15m/s or more in
this manoeuvre.
It is dangerous to induce spiral dives close to the ground due to the extreme centrifugal
forces which can cause fainting and, in some cases, blackouts or blurred vision..If you are
at all susceptible to any of these conditions, or are feeling at all unwell for any reason,
then you should not induce a spiral dive for this reason.
The exit from this manoeuvre should be performed gradually and progressively, finishing
in a nice controlled gentle turn to re-stabilise the wing. To do this, the pilot has to grad-
ually ease off the inside brake, and reduce weight shift, then gently apply a little outside
brake to ease the glider out of the spiral. The pilot must be very careful not to exit a spi-
ral (especially if well developed) too briskly, as this could result in a steep climb out (with
the wing far behind the pilot and in a very vulnerable position, with little internal pres-
sure, no airspeed and prone to collapses) followed by a sharp dive which may need damp-
ing to prevent a collapse.