Transcript Winch launches

Winch launches
NEXT
FEB 2008
DON PUTTOCK
1
Winch launches
1. Section 1 Ab-intio brief
2. Section 2 Launch failures
3. Section 3 Technical
NEXT
FEB 2008
DON PUTTOCK
2
Winch launches (section 1)
1.
2.
3.
4.
5.
6.
7.
8.
Overview
Objectives of launch
Preparation
Ground run
Acceleration/take off/transition
Full climb
Release
Cross wind
NEXT
FEB 2008
DON PUTTOCK
3
Winch launches (section 1)
(overview)
Winches can vary
considerably from
site to site.
You will need to be able to cope with the differences in power and drive systems.
NEXT
FEB 2008
DON PUTTOCK
4
Winch launches (section 1)
(overview)
•Ground run
Climb
Release
•Acceleration
•Transition
NEXT
FEB 2008
DON PUTTOCK
5
Winch launches (section 1)
(objectives)
• Attain a 45° climb angle while being able
to recover safely from any position within
the launch profile.
• Maintain a safe speed throughout.
• Not put the glider, yourself or anyone else
at risk from the launch or the cable.
• Achieve maximum height without
compromising operations or safety.
NEXT
FEB 2008
DON PUTTOCK
6
Winch launches (section 1)
(objectives)
SAFETY is the concern of everybody,
but:• As the captain of the aircraft, you are in
charge.
• If it goes wrong its your fault.
• If in doubt don’t launch
NEXT
FEB 2008
DON PUTTOCK
7
Winch launches (section 1)
(preparation)
Do not use soft (compressible ) cushions.
During the acceleration phase you may move back
and inadvertently bring the stick with you !!
NEXT
FEB 2008
DON PUTTOCK
8
Winch launches (section 1)
(preparation)
What is Vw (the maximum launch speed).
Remember that it is reasonable to exceed this
speed during the first half of the launch. So don’t
panic.
FEB 2008
DON PUTTOCK
NEXT
9
Winch launches (section 1)
(preparation)
Before take off.
• Know where the Airspeed
indicator is located.
?
• You may find yourself
trying to figure out your
speed using the wrong
instrument!!
NEXT
FEB 2008
DON PUTTOCK
10
Winch launches (section 1)
(preparation)
Is your winch hook offset?
• Offset hooks can cause the glider to turn
at “all out”, so be prepared.
NEXT
FEB 2008
DON PUTTOCK
11
Winch launches (section 1)
(preparation)
• Know where the Release
knob is and put your hand on
it.
• If you need it, you wont have
time to go hunting.
•
In this aircraft it is also
possible to block access with
the stick!!
FEB 2008
DON PUTTOCK
NEXT
12
Winch launches (section 1)
(preparation)
The trim setting is
important.
Trim lever
The trim is set for landing.
NEXT
FEB 2008
DON PUTTOCK
13
Winch launches (section 1)
(preparation)
Think about eventualities.
What is your approach speed today?
If you cant land ahead, which way will you turn?
• These are the very last things you consider before
connecting the cable.
NEXT
FEB 2008
DON PUTTOCK
14
Winch launches (section 1)
(preparation)
• Is the correct weak link
being used, is it the
correct hook?
• Remember you need to
check, people can and do
make mistakes..
NEXT
FEB 2008
DON PUTTOCK
15
Winch launches (section 1)
(preparation)
Is the cable laid out straight in front of you?
The glider will initially follow the line of the cable. If
its not straight the glider will swing, and that
might be dangerous.
NEXT
FEB 2008
DON PUTTOCK
16
Winch launches (section 1)
(preparation)
If you are ready to go.
Checks complete.
Issue the instruction to attach the cable.
• You have now authorised the launch crew
to proceed.
NEXT
FEB 2008
DON PUTTOCK
17
Winch launches (section 1)
(ground run)
Waiting for “take up slack”
•
•
•
•
•
Relax.
Keep a good lookout
Hand on release
Hold stick firmly but lightly
Rudder central
NEXT
FEB 2008
DON PUTTOCK
18
Winch launches (section 1)
(ground run)
“All-out”
• Keep the wings level with aileron.
• Steer with the rudder.
• Balance glider on its main wheel.
The controls will go from ineffective to very
effective as you accelerate.
NEXT
FEB 2008
DON PUTTOCK
19
Winch launches (section 1)
(ground run)
If a wing goes down or touches the ground
despite the application of aileron.
PULL THE RELEASE
NEXT
FEB 2008
DON PUTTOCK
20
Winch launches (section 1)
(ground run)
Keep
Whenthe
theglider
airspeed
balanced
is there,
on it
itswill
main
lift wheel
off
FEB 2008
DON PUTTOCK
21
Winch launches (section 1)
(transition)
Keeping the stick neutral, monitor the rotation into the climb
Speed good and increasing
FEB 2008
DON PUTTOCK
22
Winch launches (section 1)
(transition)
Keeping the stick neutral, monitor the rotation into the climb
Speed good and increasing
FEB 2008
DON PUTTOCK
23
Winch launches (section 1)
(transition)
Keeping the stick neutral, monitor the rotation into the climb
Speed good and increasing
FEB 2008
DON PUTTOCK
24
Winch launches (section 1)
(transition)
Keeping the stick neutral, monitor the rotation into the climb
The speed is increasing
because the aircraft is
smoothly rotating into the
climb
If the speed starts to
decay in the transition
phase, abort the launch
At every stage the glider is climbing but its
attitude is never too steep to recover safely.
NEXT
FEB 2008
DON PUTTOCK
25
Winch launches (section 1)
(transition)
Slide courtesy of the BGA
Drawing by Steve Longland
Full Climb
Transition phase
Acceleration phase
NEXT
FEB 2008
DON PUTTOCK
26
Winch launches (section 1)
(transition)
Rapid rotation means you will
be too steep too early, the
chance of recovery in a
launch failure is remote.
If the launch fails, the
deceleration will be
about 8 knots per
second!!
NEXT
FEB 2008
DON PUTTOCK
27
Winch launches (section 1)
(transition)
The angle of attack is also
dangerously high.
LIFT
This is because the wing
is doing more work.
Drag
Weight
NEXT
FEB 2008
DON PUTTOCK
28
Winch launches (section 1)
(transition)
Swift rotation =
high lift load =
high AofA
Slower rotation =
Lower lift load =
Lower AofA
Darker shading
represents A of A
Slide courtesy of the BGA
Drawing by Steve Longland
NEXT
FEB 2008
DON PUTTOCK
29
Winch launches (section 1)
(The full climb)
Too steep:
1. Better climb
2. Risk breaking weak link
3. More difficult to recover
NEXT
FEB 2008
DON PUTTOCK
30
Winch launches (section 1)
(The full climb)
Too shallow:
1. Poor rate of climb
2. Risk overspeeding
3. Launch failures start
lower and further
into the field.
NEXT
FEB 2008
DON PUTTOCK
31
Winch launches (section 1)
(The full climb)
About 45°:
1. Optimum climb
2. Safest recovery.
How do you know you are
climbing at 45° ?
NEXT
FEB 2008
DON PUTTOCK
32
Winch launches (section 1)
(The full climb)
During the launch we need to know:
1. Our airspeed.
2. Our angle of climb.
Airspeed trends are seen on the
airspeed indicator
Our climb angle is seen, by
assessing the angle with the
horizon.
NEXT
FEB 2008
DON PUTTOCK
33
Winch launches (section 1)
(The full climb)
During the launch we need to know:
1. Our airspeed.
2. Our angle of climb.
So we must continually scan
between the wingtips and the ASI
NEXT
FEB 2008
DON PUTTOCK
34
Winch launches (section 1)
(The full climb)
SCAN
ASI
CLIMB ANGLE
NEXT
FEB 2008
DON PUTTOCK
35
Winch launches (section 1)
(The full climb)
Keep straight by:Keeping both wings equidistant above the
horizon.
Pointing at a cloud straight ahead
Keeping the same amount of ground on
either side of the nose.
NEXT
FEB 2008
DON PUTTOCK
36
Winch launches (section 1)
(The full climb)
If the speed starts to decay:
Progressively lower the nose until the speed
returns.
If the speed does not return by level flight,
pull the release and abort.
If the speed returns, cautiously return to the
climb. Only accept one reduction in speed.
NEXT
FEB 2008
DON PUTTOCK
37
Winch launches (section 1)
(The full climb)
If the speed starts to increase:
Check your climb angle is correct.
Signal “too fast”.
If the speed exceeds Vw on the 2nd half of
the launch, pull the release.
NEXT
FEB 2008
DON PUTTOCK
38
Winch launches (section 1)
( Too Fast )
If the speed starts to
increase:
Give the too fast signal
FEB 2008
DON PUTTOCK
39
Winch launches (section 1)
( Too Fast )
If the speed starts to
increase:
Give the too fast signal
FEB 2008
DON PUTTOCK
40
Winch launches (section 1)
( Too Fast )
If the speed starts to
increase:
Give the too fast signal
FEB 2008
DON PUTTOCK
41
Winch launches (section 1)
( Too Fast )
If the speed starts to
increase:
Give the too fast signal
FEB 2008
DON PUTTOCK
42
Winch launches (section 1)
( Too Fast )
If the speed starts to
increase:
Give the too fast signal
FEB 2008
DON PUTTOCK
43
Winch launches (section 1)
( Too Fast )
If the speed starts to
increase:
Give the too fast signal
NEXT
FEB 2008
DON PUTTOCK
44
Winch launches (section 1)
(hunting)
FEB 2008
DON PUTTOCK
45
Winch launches (section 1)
(hunting)
FEB 2008
DON PUTTOCK
46
Winch launches (section 1)
(hunting)
FEB 2008
DON PUTTOCK
47
Winch launches (section 1)
(hunting)
FEB 2008
DON PUTTOCK
48
Winch launches (section 1)
(hunting)
FEB 2008
DON PUTTOCK
49
Winch launches (section 1)
(hunting)
FEB 2008
DON PUTTOCK
50
Winch launches (section 1)
(hunting)
FEB 2008
DON PUTTOCK
51
Winch launches (section 1)
(hunting)
Too much back
pressure on stick
You are near
the top
Relax the back
pressure
NEXT
FEB 2008
DON PUTTOCK
52
Winch launches (section 1)
(The release)
Lower the nose, the speed is normally
reducing.
You may feel the glider being pulled down.
Pull the release.
NEXT
FEB 2008
DON PUTTOCK
53
Winch launches (section 1)
Co-ordinated turn
into wind
Keep straight until
the full climb
Slide courtesy of the BGA
Drawing by Steve Longland
NEXT
FEB 2008
DON PUTTOCK
54
Winch launches (section 1)
Summary
• Be mentally prepared
• 3 stages—ground run and acceleration,
transition, full climb and release.
• Keep wings level stick neutral.
• Monitor the rotation into the climb
• Maintain climb angle---look at wings.
• Monitor the speed on the ASI
NEXT
FEB 2008
DON PUTTOCK
55
Winch launches (section 1)
Further Reading
END of Section 1
FEB 2008
NEXT
DON PUTTOCK
56
Winch launches (section 2)
(launch failures)
55 Knots
Normal Launch
NEXT
FEB 2008
DON PUTTOCK
57
Winch launches (section 2)
(launch failures)
55 Knots
Pilot hears
cable release
Pilot feels g
Pilots knows the
problem now
exists.
NEXT
FEB 2008
DON PUTTOCK
58
Winch launches (section 2)
(launch failures)
52 Knots
Recovery action initiated
Aircraft starts decelerating
NEXT
FEB 2008
DON PUTTOCK
59
Winch launches (section 2)
(launch failures)
50 Knots
Reduced G sensation
Deceleration reduced
NEXT
FEB 2008
DON PUTTOCK
60
Winch launches (section 2)
(launch failures)
Glider stable and
accelerating
50 Knots
NEXT
FEB 2008
DON PUTTOCK
61
Winch launches (section 2)
(launch failures)
Glider stable and
accelerating
52 Knots
NEXT
FEB 2008
DON PUTTOCK
62
Winch launches (section 2)
(launch failures)
55 Knots
FEB 2008
DON PUTTOCK
63
Winch launches (section 2)
(launch failures)
55 Knots
FEB 2008
DON PUTTOCK
64
Winch launches (section 2)
(launch failures)
52 Knots
FEB 2008
DON PUTTOCK
65
Winch launches (section 2)
(launch failures)
50 Knots
FEB 2008
DON PUTTOCK
66
Winch launches (section 2)
(launch failures)
50 Knots
FEB 2008
DON PUTTOCK
67
Winch launches (section 2)
(launch failures)
52 Knots
NEXT
FEB 2008
DON PUTTOCK
68
NEXT
FEB 2008
DON PUTTOCK
69
NEXT
FEB 2008
DON PUTTOCK
70