14
Spiral dive
The spiral dive is the most effective method for making a rapid descent, and can allow sink
rates of up to 20 m/s to be reached. It is suitable where there is a high ascent rate and little
wind.
However, the very high G-forces make it difficult to sustain a spiral dive for long and it can
place high loads on the passenger, pilot and glider.
The Pasha 7 fulfils the EN spiral dive requirements and has no tendency to remain in a
stable spiral dive under normal conditions. Note! The certification test flights are carried out
with a defined carabiner distance. Deviations from this defined setting, unapproved
harnesses or spirals with excessive sink can change the manoeuvre considerably; pilot
action may be required. In such cases, exit the spiral by weight-shifting to the outside and
progressively applying the outside brake.
Before entering a spiral, make sure you have adequate height for recovery. To initiate a
spiral, look in to the direction you want to turn, weight shift and smoothly pull down on the
inside until the glider enters the spiral. Once in the spiral you should re-centre your weight
shift and apply a little outside brake to keep the outer wing tip pressured and inflated.
Spirals with descent rates above 10 m/s are not recommended. Very high decent spiral
dives with high speeds and G-forces can be very disorientating and could lead to a loss of
vision and even black out. Always pay particular attention to your altitude. Always maintain
ground clearance of 150 – 200 m. The manoeuvre must be exited at this height above
ground.
To exit the spiral, check your weight is centred (or slightly towards the outside) and
progressively release the inside brake. As the glider starts to exit the spiral, you may also
choose to reduce the pendulum moment by briefly re-applying the inside brake.
Attention! Due to energy retention, the glider will climb a lot after a deep spiral-dive
release. If you apply inner brake and decelerate the glider for two or three turns, big
pendulum effects can be avoided.
WARNING!! Practise spiralling with caution and lower sink-rates to get a feel for the
gliders behaviour. A pilot who is dehydrated or not accustomed to spiralling can lose
consciousness in a steep spiral dive!
Spiral dive with tucked ear (asymmetric side collapse)
The spiral is the most effective descent, but has the disadvantage of the high G load on the
pilot and passenger. To avoid this G-load, you can fly a spiral dive with one ear collapsed
on the outside and achieve almost the same sink rates with a greatly reduced G-load.
However, the material stress is high.
The spiral dive is initiated by pulling on A1-riser ( the ear collapses) and holding the hand
on the A1-riser. With the other hand you carefully initiate a spiral. Your seating position
remains neutral. Recovering is done simply by slowly releasing the inside brake. Higher
sink rates are achieved when 50% of the leading edge is folded.
Содержание Pasha 7
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