DAVINCI GLIDERS DUET User manual

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MANUAL
REV. 3
JAN 2019
Davinci Products Inc.
53 Sinchon-gil, Okcheon-myeon, Yangpyeong-gun, Gyeonggi-do, South Korea. (12505)
Tel. [phone] Fax. [phone]
[e-mail] , [e-mail]

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Congratulations!
Thank you for choosing the DUET#.
The DUET# has been designed for professional
tandem pilots who want to share their most fantastic
moments.
This manual will help you to get all information about
your glider. We strongly recommend that you read this
manual carefully in order to be aware of any general
limitations, performance characteristics, take off and
flight characteristics, landing procedures, dealing with
emergency situations and general maintenance.
This is information about the design of the DUET#,
advice how to use it best and how to care for it to
ensure it has a long life, We hope that the DUET# will
give you a lot of satisfactory flying times.
-DAVINCI GLIDERS TEAM-
WARNING!
THIS IS NOT TRAINING MANUAL. ATTEMPTING TO FLY THIS OR
ANY OTHER PARAGLIDER WITHOUT PROPER INSTRUCTION FROM
A CERTIFIED PROFESSIONAL INSTRUCTOR IS EXTREMELY
DANGEROUS TO YOURSELF AND BYSTANDERS.
DAVINCI GLIDERS are carefully manufactured and inspected at the
factory. Please use the glider only as described in this manual.
Do not make any modifications to the glider.
As with any sport – without taking the
necessary safety precautions, paragliding can be dangerous.

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1. Technical DATA

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DUET
#34
39
41
#42
#44
CELLS
NUMBER
54
54
54
54
54
CLOSED
10
10
10
10
10
FLAT
AREA
m2
34.5
38.5
41.1
42.0
44.0
SPAN
m
13.8
14.4
14.8
14.9
15.3
ASPECT RATIO
5.4
5.4
5.4
5.4
5.4
PROJECTED
AREA
m2
30.5
33.1
35.2
36.0
37.8
SPAN
m
11.0
11.4
11.8
11.9
12.2
ASPECT RATIO
3.94
3.94
3.94
3.94
3.94
FLATTENING
%
14
14
14
14
14
CORD
MAX
m
3.25
3.38
3.49
3.53
3.62
MIN
m
0.68
0.71
0.13
0.74
0.76
AVER
m
2.58
2.68
2.78
2.80
2.89
LINES
HEIGHT
m
8.22
8.57
8.99
9.04
9.26
MAIN
2+1/4/3/2
RISERS
NUMBER
4
A+A’/B/C/D
TRIMS
mm
110
110
110
110
110
ACCELERATOR
No
No
No
No
No
WEIGHT RANGE
(Free flight)
MIN-MAX
KG
90-180
110-190
120-212
120-230
130-248
WEIGHT RANGE
(PPG / DGAC)
MIN-MAX
KG
90-350
110-300
120-310
120-360
120-380
CERTIFICATION
EN-926-1/2, LTF
KG
EN-B
EN-B
EN-B
EN-B
EN-B
GLIDER WEIGHT
KG
6.6
6.5
6.7
7.9
8.4

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2. MATERIALS DATA
CANOPY
FABRIC CODE
SUPPLIER
UPPER
SURFACE
Leading Edge
30D MF(WR)
Dominico
Middle/Tailing
Skytex 38
PORCHER IND
BOTTOM SURFACE
Skytex 32
PORCHER IND
PROFILES
Loading
Skytex 40
PORCHER IND
Unloading
30D FM
Dominico
DIAGONALS
Skytex 40
PORCHER IND
SUSPENSION LINES
FABRIC CODE
SUPPLIER
UPPER CASCADES
PPSL 160/120
LIROS
DSL 70
LIROS
UPPER MIDDLE CASCADES
PPSL-200/160
LIROS
LOWER MIDDLE CASCADES
PPSL-160
LIROS
MAIN
7343-420/280
EDELRID
UPPER/MIDDLE STABLE
PPSL 120
LIROS
MAIN STABLE
TNL-140
TEIJIM
UPPER BRAKE
DSL 70
LIROS
MIDDLE BRAKE
PPSL-120
LIROS
MAIN BREAK
7850X-240
EDELRID
RISERS
FABRIC CODE
SUPPLIER
MATERIAL
WEBBING 20MM
GUTH&WOLF GMBH
PULLEYS
RIELY
LW RILEY PTY LTD

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3. Introduction and Pilot Target
The DUET# is a tandem paraglider suitable for both
commercial and entering of tandem flying. You must
be in possession of the appropriate licence and
insurances to fly with passengers.
You must do not
- Be flown with more than the maximum certified total weight
- Be towed with a tow line tension in excess of 200kg
The DUET# has been classified as EN-B and LTF-B.
The glider has been type-tested for “one-and
two-seated” use.
During type-testing the DUET# was tested with a ‘GH’
type harness. The setup shown on the below picture.

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4. Risers
DUET# has 4 risers. The A riser has a red cover to
easy identification. There is another line with red
mailon. There is A’ and is for the big ears.
The tolerance should not be more than ±5mm from
the standard riser length.
Standard
[mm]
Trim opened
[mm]
Travel length
[mm]
A
360
360
0
B
360
387
27
C
360
442
82
D
360
470
110

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5. Lines
They come in different diameters of Kevlar and
Dyneema with sheathed cover. They must to be
inspected every 150 hours maximum.
In case of Brake lines, it was cut a little longer, so
every pilot can adjust it according to his personal taste.
But you must always leave 10cm before the brakes
line starts acting in order to avoid trailing edge
deformation when the wing is fully trim opened. In
case the brake handle comes loose during flight or any
brake lines is cut you can use the D riser softly for
directional control instead of brake line.
If you feel it is necessary to adjust the brake-line
length to suit physical build, we recommend you
ground handle the glider before you test-fly it and
carry out this process after every 20mm of adjustment.
6. Trimmers (Accelerator)
The DUET# is supplied with a trim riser set. The
‘neutral’ or standard position is when the trimmers are
pulled all the way down and A/B/C/D riser lengths are
equal. We recommend performing landing and take-off
with the trimmers closed. With the trimmers closed,
the DUET# will reliably inflate without any
overshooting.
As a result, the take off characteristics are very
smooth, straightforward, easy, forgiving and require no

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special skills.
You can be accelerated in flight using the trimmers
which make low angle of attack and increase the flying
speed. DUET# trimmers provide you with more
satisfying flight on windy days.
We advise you to use this trimmers carefully and do
not use in turbulent and strong thermal conditions.
During full trim condition should be meet the dynamic
reaction flight of the wing in case of collapse.
The DUET# doesn’t have the accelerator system.
7. Pre-flight check
To know yourself with the glider it is a good idea to
perform practice inflations and ground handling in advance.
You should have no difficulties flying the DUET# for the first
time in suitable conditions, but as with all new equipment.
When you have the new glider, the below points should
be inspected.
- Check the lines are clear and not twisted.
- Connection points between the glider and harness.
- All harness buckles are closed.
- The Karabiners are fully closed and not damaged.
- The sewing, condition of the lines and connection of
the lines are right
- Internal demage to ribs and diagonal ribs.
- Demage to the top and bottom panels and seams
between panels.

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8. Take-0ff
DUET# has easy inflation behaviour at the
forward/reverse launch because of its super light
glider weight. To get the right wing shape for the
take-off, pull the brake until the canopy shows at the
perfect banana shape on the flat ground. While
inflating the DUET#, you should hold both of th A
risers on your hands. Smoothly and gradually inflate
the wing. It does not need excessive energy and you
feel the lift force very fast. It does not tend to
over-shooting characteristics and provides a leisurely
launch time with your passenger.
We recommend to take off with closed trimmers.
9. In flight characteristics
DUET# has the best glide performance in a normal
trim position with no any brakes.
In strong thermals and turbulence, we recommend to
gently pull both brakes to increase stability without
trim released.
To familiarize yourself with the DUET# your first turns
should be gradual and progressive.
To make efficient and coordinated turns with the
DUET# first look in the direction you want to go and
check that the airspace is clear. Your first input for
directional change should be weight-shift, followed by
the smooth application of the brake until the desired

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bank angle is achieved. To regulate the speed and
radius of the turn, coordinate your weight shift and
use the outer brake.
In the unlikely event that a brake line releases from
the brake handle or breaks, the glider is manoeuvrable
using the D-risers. By pulling gently on the D-risers it
is possible to steer the glider and land safely.
Alternative Steering:
In the unlikely event, that a brake line releases from
the brake handle, or breaks, or the brake-lines are
tangled up, the glider is manoeuvrable using the
rear-risers. By pulling gently on the rear-risers, it is
possible to steer the glider and land safely. Don’t pull
the rear-risers too much, to avoid a deep stall!
10. Deflations
In spite of the DUET# has great stability of the flight,
strong turbulence or piloting error may cause a
portion of the wing suddenly to be a deflation.
10.1 Asymmetric collapse
Asymmetric collapse usually happens when the pilot
has not foreseen this possible reaction of the wing.
Asymmetric collapses should be controlled by weight
shifting away from the collapse and applying enough

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brake to control your direction. And you should use
the brake to re-inflate the glider.
10.2 Frontal collapse
DUET# does not come out the symmetrical front
collapse by itself. It has high internal pressure with its
well designed profile. However a symmetric collapse my
occur in strong turbulent condition, but It could be
fast recovered, if you apply the brake down to 15 to
20cm. Release the brake lines, you may recover to the
normal flight.
10.3 Full stall
Full stall can occur when you fully pull the both
brakes enough long time. To recover to the normal
flight you must release both brakes. After this usually
comes a front dive with a possible front deflation. An
asymmetric recovery (one control released faster than
the other) from a full-stall can cause a big dynamic
collapse. The full-stall is a hazardous manoeuvre and
not recommended as it requires very high forces.
The available brake travel before stalling the wing
depends on the size and the flight weight. For the
DUET# it has minimum of 65cm(Max. 70cm) travel
length at maximum total-load. Those numbers are just
a rough indication. (The publication of the brake travel
is claimed by the EN 926-2.)

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It would be dangerous to use the brake travel
according to those numbers, because it is not
practicable to measure the brake travel during flight,
and in turbulences the stall might occur with less
brake travel. If you want to use the whole brake travel
of your glider safely, it is necessary to do many
intended spins and full stalls to get a feeling for the
stall behaviour.
10.4 Deep stall
It is possible for gliders to enter a state of deep stall.
This can be caused by several situations including; a
very slow release from a B-line stall; flying the glider
when wet; or after a front/symmetric deflation.
When you meet this situation you should fully raise up
the both brakes and push the A-risers forwards or
release the trims symmetrically to regain normal flight.
10.5 Asymmetrical stall
It can take place when you pull one of the brakes too
hard, or while spiraling at a small speed in turbulence
you increase the angle of attack. Rotation in the
asymmetrical stall is called negative spiral. This is one
of the most dangerous flying situations. In order to get
out of asymmetrical stall, just release the brakes.
There may follow side thrust forward with a following
wing collapse.

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10.6 B stall
We do not recommend a B stall with the DUET#. This
techniques is generally very hard to use with DUET#
by the high force needed to pull down the B lines.
10.7 Cravat
In case a cravat should occur from an asymmetric
collapse or other manoeuvres, it is important to keep
your flying direction by applying some brake on the
opposite side and weight shift.
You can also use strong deep pumps on the brake to
the cravated side. If a pull of the break line is
unsuccessful, pulling the stable line which is the
outermost line on the B-riser may work.
If you can not do it and the rotation is increasing, you
must use the parachute.

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11. Descent Techniques
11.1 Big ears
Sink rate can be decreased in a controlled way by
folding both wing tips. While holding the brakes you
should symmetrically pull the outermost A-risers.
In order to return to the normal flight, you should
release the A-risers and pull the brake short times
until wing tips regain pressure.
Spiraling is not permitted with big ears, because of the
increased load on the remaining lines so that they can
be physically deformed.
11.2 Spiral dive
When you hold one sided brake down for a long time,
the glider goes into a fast sharp turn and loses a lot
of height. The sink rate could be more than 15
m/sec. To get out of the spiral dive you must release
the inner brake and use the outside brake to manage
your sink rate. Mind that DUET# may take one more
turn after releasing the brake.
12. Special Flying
12.1 Towing
The DUET# does not experience any problem when
being towed. Only qualified personnel should handle
the qualified equipment to carry out this operation.
The wing has to be inflated in the same way as in

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normal flight.
12.2 Acrobatic flight
The DUET# HAS NOT been designed for acrobatic
flight and we DO NOT recommend continued use in
this type of flight. We consider acrobatic flight to be
any form of piloting that is different to normal flight.
To learn safely how to master acrobatic manoeuvres
you should attend lessons which are carried out by a
qualified instructor and over water. Extreme
manoeuvres take you and your wing to centrifugal
forces that can reach 4 to 5g.
Materials will wear more quickly than in normal flight.
If you do practice extreme manoeuvres we recommend
that you submit your wing to a line revision every six
months.
13. Landing
We recommend to land with trimmers to the normal
slow position. Don’t use the sharp turns or radical
maneuvers.
When you are 1-2m over the ground, you should face
into wind and pilot and passenger standing upright and
ready to run if necessary. Finally you may pull the
brakes smoothly for minimize vertical speed.
Don’t hit the ground by your overtake the glider.
If you in windy condition, as soon as you touch the

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ground you have to turn around with your passenger
to face the glider and move towards it during full
pulling break symmetrically.
14. Packing your DUET#
The DUET# need be folded cell to cell to keep the
plastic reinforcement at the leading edge lie flat on
each other and don’t get bent. Try to pack your
DUET# as loosely as the packing bag allows, because
every fold weakens the fabric.
Avoid packing the glider where it is wet or abrasive
conditions(sand, asphalt pavement, concrete)
15. Maintenance and cleaning
Cleaning should be carried out with only pure water. If
the glider comes in contact with salt water, clean
thoroughly with fresh water. Do not use solvents of
any kind, as this may remove the protective coatings
and destroy the fabric.
16. Caring tips
- Do not expose your glider to the sun any longer
than necessary
- Keep it away from water and other liquids
- Do not let the front edge hit the ground
- Keep your glider away from fire
- Do not put anything heavy on your glider, do not

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pack it in a rucksack too tightly.
- Regularly inspect the canopy, lines, risers and
harness. If you find any defects, contact your dealer
or the manufacturer. Do not attempt to repair the
paraglider by yourselves.
- If you detect a damaged line, inform the dealer or
manufacturer about the line number according to the
line plan
- Keep your DUET# in a bag in a dry well-ventilated
place under neutral temperature and humidity
conditions
- If you do not use the glider, then once a month you
should unpack it, ventilate it well, and then pack it
back in the bag
17. Warrantee
The producer guarantees the correctness of the
declared characteristics and the paraglider’s normal
performance for two years after the purchase date.
The producer conducts special, and after warranty
repairs and maintenance at the owners’ request for an
extra price. The warrantee does not cover misuse or
abnormal use of the materials.
We recommend to inspect your paraglider (including
checking suspension line strength, line geometry, riser
geometry and permeability of the canopy material) one
time at two years, or every 150 hours of flying time

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(whichever comes first); Those inspection must be
made by manufacturer, importer, distributor, dealer or
other authorised persons. The checking must be
proven by a stamp on the certification sticker on the
glider as well in the manual book. Also they will offer
you the spare materials like the magnetic, trimmer
webbing and so on.
18. Respecting nature and environment
Finally, we would ask each pilot to take care of nature
and our environment. Respect nature and the
environment at all times but most particularly at
take-off and landing places. Respect others and
paraglider in harmony with nature.
Do not leave marked tracks and do not leave rubbish
behind. Do not make unnecessary noise and respect
sensitive biological areas.
The materials used on a paraglider should be recycled.
Please send old Davinci gliders back to us Davinci
Gliders offices. We will undertake to recycle the glider.

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Checked line sheet(with riser)
The measured values at the lower surface of the tailing edge, cll depth
and spacing of the articulation points were determined under tensile load
of 50N. The tolerance should not be more than ±10mm between the below
length and reality.
DUET# 34 size
A
B
C
D
E
Brake
1
793.7
785.2
788.3
801.7
808.0
872.9
2
786.6
777.3
779.9
792.9
799.2
840.8
3
789.7
780.8
784.3
797.8
803.6
817.1
4
788.4
779.5
783.0
795.9
801.2
806.1
5
781.4
772.4
776.0
787.5
792.4
789.3
6
779.6
771.1
775.1
786.2
790.7
777.5
7
782.2
775.1
779.5
791.1
795.1
772.2
8
763.7
762.3
767.2
773.2
775.3
9
751.0
750.9
755.3
761.3
767.3
10
738.2
739.9
745.2
750.8
762.1
11
729.0
732.4
737.7
743.3
759.4
12(STABLE)
714.5
711.8
714.4
720.5
758.4
13(STABLE)
703.0
705.4
710.0
755.8
Name
3d
Length
Name
3d
Length
Name
3d
Length
Name
3d
Length
Name
3d
Length
Name
3d
Length
a1
235.0
b1
218.2
c1
204.2
d1
85.4
e1
91.6
br1
166.8
a2
227.9
b2
210.3
c2
195.8
d2
84.9
e2
91.2
br2
134.6
a3
231.0
b3
213.8
c3
200.2
d3
81.8
e3
87.7
br3
136.0
a4
158.0
b4
149.2
c4
142.6
d4
74.8
e4
80.1
br4
125.0
a5
150.9
b5
142.1
c5
135.5
d5
70.8
e5
75.7
br5
130.2
a6
149.6
b6
140.8
c6
134.6
d6
69.5
e6
74.0
br6
118.4
a7
152.2
b7
144.8
c7
139.0
d7
70.0
e7
74.0
br7
121.0
a8
136.4
b8
128.0
c8
117.9
d8
118.4
br8
124.1
a9
123.6
b9
116.6
c9
106.0
d9
106.5
DI
578.3
br9
117.5
a10
122.8
b10
115.7
c10
105.6
d10
105.2
DII
499.1
br10
112.2
a11
113.5
b11
108.2
c11
98.1
d11
97.7
br11
114.8
a12
53.7
b12
51.0
c12
49.3
d12
55.4
br12
113.8
b13
42.2
c13
40.3
d13
44.9
st1
71.7
br13
111.2
st2
75.2
A1
150.0
B1
141.2
C1
135.1
D1
106.0
st3
76.0
BR1
149.2
A2
149.6
B2
141.2
C2
135.1
D2
97.7
BR2
124.1
A3
130.2
B3
121.9
C3
110.0
D3
105.6
STM
553.1
BR3
124.1
A4
118.4
B4
111.8
C4
100.3
D4
61.6
BR4
116.2
D5
57.2
BR5
110.9
AI
522.7
BI
532.0
CI
549.1
D6
57.2
BR6
105.6
AII
444.4
BII
454.1
CII
470.4
D7
61.6
AIII
462.1
BIII
477.4
CIII
504.2
D8
116.6
BRI
223.5
D9
107.4
BRII
201.5
BRIII
205.5
DM1
129.4
DM2
129.4
BRI
333.5