DaVinci DUET PRO 40 User manual

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MANUAL
REV. 1
MAY 2021
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 PRO.
The DUET PRO 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
PRO, advice on how to use it best and how to care for
it to ensure it has a long life, We hope that the DUET
PRO 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
DUET PRO 40 42
CELLS
NUMBER 50 50
CLOSED 8 8
FLAT
AREA m239.8 41.5
SPAN m 14.8 15.1
ASPECT RATIO 5.5 5.5
PROJECTED
AREA m234.2 35.6
SPAN m 11.9 12.1
ASPECT RATIO 4.1 4.1
FLATTENING % 14.1 14.1
CORD
MAX m 3.27 3.33
MIN m 0.90 0.92
AVER m 2.69 2.75
LINES
HEIGHT m 8.69 8.87
MAIN 2+1/3/3/2
RISERS
NUMBER 4 A+A’/B/C/D
TRIMS mm 110 110
WEIGHT RANGE
(Free flight) MIN-MAX KG 100-210 120-230
CERTIFICATION EN-926-1/2, LTF/
DGAC KG EN-B EN-B
GLIDER WEIGHT KG 7.2 7.4

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2. MATERIALS DATA
CANOPY
FABRIC CODE
SUPPLIER
UPPER
SURFACE
Leading Edge
MJ40 MF
MYUNGJIN TEX
Middle/Tailing
MJ40 MF
MYUNGJIN TEX
BOTTOM SURFACE
MJ40 MF
MYUNGJIN TEX
PROFILES
Smart Nose+
MJ38 HF
MYUNGJIN TEX
Loading
MJ38 HF
MYUNGJIN TEX
Unloading
MJ38 HF
MYUNGJIN TEX
DIAGONALS
MJ32 HF
MYUNGJIN TEX
Leading Edge Reinforcement
410D Nylon PU
NAVI TEX
SUSPENSION LINES
FABRIC CODE
SUPPLIER
UPPER CASCADES
TNL 145/125/80
Daegu Braiding Co
MIDDLE CASCADES
TNL 200/180/145
Daegu Braiding Co
MAIN
TNL 400/280
Daegu Braiding Co
UPPER STABLE
TNL 125
Daegu Braiding Co
MIDDLE STABLE
TNL 125
Daegu Braiding Co
MAIN STABLE
TNL 145
Daegu Braiding Co
UPPER BRAKE
TNL 80
Daegu Braiding Co
MIDDLE H/L BRAKE
TNL 180/125
Daegu Braiding Co
MAIN BREAK
TNL 400
Daegu Braiding Co
RISERS
FABRIC CODE
SUPPLIER
MATERIAL
WEBBING 20MM
GUTH&WOLF GMBH
AI Sub riser
6mm Dyneema
Liros
PULLEYS
RIELY
Ronstan

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3. Introduction and Pilot Target
The DUET PRO is a tandem paraglider suitable for the
professional commercial flying.
You must be in possession of the appropriate license
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 250kg
The DUET PRO 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 PRO was tested with a
‘GH’ type harness. The setup is shown in the below
picture.

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4. Risers
DUET PRO has 4 risers. The A riser has a red cover
for easy identification. There is another line with red
mailon. There is A’ and is for the big ears.
There is a 100mm A1 sub riser. It will be helpful for
your soft take-off in the windy condition.
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
415
55
D
360
470
110

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5. Lines
They come in different diameters of Kevlar and
Dyneema with sheathed cover. They must be inspected
every 150 hours maximum.
In the 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 brake 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 line is cut you can use the D riser softly for
directional control instead of the brake line.
If you feel it is necessary to adjust the brake-line
length to suit physical build, we recommend you
ground handling the glider before you test-fly it and
carry out this process after every 20mm of adjustment.
6. Trimmers (Accelerator)
The DUET PRO 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 PRO will reliably inflate without any
overshooting.
As a result, the take-off characteristics are very
smooth, straightforward, easy, forgiving, and require

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no special skills.
You can be accelerated in flight using the trimmers
which make a low angle of attack and increase the
flying speed. DUET PRO trimmers provide you with a
more satisfying flight on windy days.
We advise you to use these trimmers carefully and do
not use them in turbulent and strong thermal
conditions. During full trim, conditions should be meet
the dynamic reaction flight of the wing in case of
collapse.
The DUET PRO doesn’t have an 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 PRO
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

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- Internal damage to ribs and diagonal ribs.
- Damage to the top and bottom panels and seams
between panels.
8. Take-0ff
DUET PRO has easy inflation behavior 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 the
perfect banana shape on the flat ground. While
inflating the DUET PRO, you should hold both of the A
risers in 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 PRO has the best glide performance in a normal
trim position with no any brakes.
In strong thermals and turbulence, we recommend
gently pull both brakes to increase stability without
trim released.
To familiarize yourself with the DUET PRO your first
turns should be gradual and progressive.
To make efficient and coordinated turns with the DUET

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PRO 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
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 maneuverable
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 maneuverable 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 PRO has great stability of the
flight, strong turbulence or piloting error may cause a
portion of the wing suddenly to be deflation.
10.1 Asymmetric collapse

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The 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
brake to control your direction. And you should use
the brake to re-inflate the glider.
10.2 Frontal collapse
DUET PRO does not come out the symmetrical front
collapse by itself. It has high internal pressure with its
well designed profile. However symmetric collapse may
occur in strong turbulent conditions, 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
The full stall can occur when you fully pull both
brakes enough a 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 maneuver and
not recommended as it requires very high forces.
The available brake travel before stalling the wing

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depends on the size and the lightweight. The DUET
PRO has a 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.)
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 turbulence, 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 behavior.
10.4 Deep stall
It is possible for gliders to enter a state of the 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
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

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you increase the angle of attack. Rotation in the
asymmetrical stall is called a negative spiral. This is
one of the most dangerous flying situations. In order
to get out of the asymmetrical stall, just release the
brakes. There may follow side thrust forward with the
following wing collapse.
10.6 B stall
We do not recommend a B stall with the DUET PRO.
This technique is generally very hard to use with DUET
PRO 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 maneuvers, 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 cravatted side. If a pull of the brake 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
The sink rate can be decreased in a controlled way by
folding both wingtips. 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 the 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 PRO may take one
more turn after releasing the brake.
12. Special Flying
12.1 Towing
The DUET PRO 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 normal flight.

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12.2 Acrobatic flight
The DUET PRO HAS NOT been designed for acrobatic
flight and we DO NOT recommend continued use in
this type of flight. We consider an acrobatic flight to
be any form of piloting that is different from a normal
flight. To learn safely how to master acrobatic
maneuvers you should attend lessons which are carried
out by a qualified instructor and over water. Extreme
maneuvers take you and your wing to centrifugal
forces that can reach 4 to 5g.
Materials will wear more quickly than in normal flights.
If you do practice extreme maneuvers we recommend
that you submit your wing to a line revision every six
months.
13. Landing
We recommend landing with trimmers to the normal
slow position. Don’t use 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 to minimize vertical speed.
Don’t hit the ground by your overtake the glider.
If you in windy condition, as soon as you touch the
ground you have to turn around with your passenger

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to face the glider and move towards it during full
pulling break symmetrically.
14. Packing your DUET PRO
The DUET PRO needs to 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
PRO 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
pack it in a rucksack too tightly.

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- 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 PRO 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 warranty does not cover misuse or
abnormal use of the materials.
We recommend inspecting 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
(whichever comes first); Those inspections must be
made by the manufacturer, importer, distributor, dealer

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or other authorized 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 spare materials like magnetic, trimmer webbing,
and so on.
The Nylon fabric-reinforced on the leading edge of
DUET PRO is specially designed to extend the life of
the glider in tough and somewhat harsh environments
by applying additional reinforcement in consideration
of the Davinci Gliders. Even if the fabric and nylon
reinforcement layer are separated by abrasion, there
are no major problems with the strength and glide
safety of the product itself, except for aesthetic issues.
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 PRO 40 size (With riser)
A
B
C
D
E
Brake
1
8767
8644
8700
8749
8843
9561
2
8676
8554
8613
8670
8772
9209
3
8681
8561
8619
8656
8756
9026
4
8669
8550
8605
8718
8807
9038
5
8654
8534
8589
8687
8778
8765
6
8729
8613
8666
8622
8703
8583
7
8708
8581
8634
8596
8675
8555
8
8629
8501
8555
8629
8680
8623
9
8640
8520
8571
8462
8574
10
8615
8501
8551
8309
8456
11
8597
8487
8536
8430
12
8656
8551
8593
8513
13
8542
8452
8414
14
8388
8328
8294
15
8232
8213
8201
16
8146
8119
8111
ST
7932
7883
7904
7929
DUET PRO 42 size
A
B
C
D
E
Brake
1
8952
8831
8873
8926
9025
9765
2
8857
8740
8786
8846
8953
9421
3
8865
8747
8791
8833
8938
9269
4
8853
8736
8778
8896
8989
9286
5
8838
8721
8762
8864
8960
8925
6
8914
8801
8840
8799
8884
8739
7
8893
8788
8812
8772
8856
8711
8
8813
8707
8733
8805
8861
8781
9
8824
8725
8748
8645
8739
10
8798
8707
8728
8489
8619
11
8780
8692
8713
8591
12
8840
8757
8770
8675
13
8724
8637
8589
14
8567
8511
8466
15
8407
8393
8371
16
8319
8297
8279
ST
8101
8056
8068
8104

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Name
Manufacturer
Name
Manufacturer
Name
Manufacturer
Name
Manufacturer
Name
Manufacturer
Name
Manufacturer
a1
TNL 145
b1
TNL 145
c1
TNL 125
d1
TNL 80
e1
TNL 80
br1
TNL 80
a2
TNL 145
b2
TNL 145
c2
TNL 125
d2
TNL 80
e2
TNL 80
br2
TNL 80
a3
TNL 145
b3
TNL 145
c3
TNL 125
d3
TNL 80
e3
TNL 80
br3
TNL 80
a4
TNL 145
b4
TNL 145
c4
TNL 125
d4
TNL 80
e4
TNL 80
br4
TNL 80
a5
TNL 145
b5
TNL 145
c5
TNL 125
d5
TNL 80
e5
TNL 80
br5
TNL 80
a6
TNL 145
b6
TNL 145
c6
TNL 125
d6
TNL 80
e6
TNL 80
br6
TNL 80
a7
TNL 125
b7
TNL 125
c7
TNL 80
d7
TNL 80
e7
TNL 80
br7
TNL 80
a8
TNL 125
b8
TNL 125
c8
TNL 80
d8
TNL 80
e8
TNL 80
br8
TNL 80
a9
TNL 125
b9
TNL 125
c9
TNL 80
d9
TNL 80
br9
TNL 80
a10
TNL 125
b10
TNL 125
c10
TNL 80
d10
TNL 80
br10
TNL 80
a11
TNL 125
b11
TNL 125
c11
TNL 80
br11
TNL 80
a12
TNL 125
b12
TNL 125
c12
TNL 80
st1
TNL 125
br12
TNL 80
a13
TNL 125
b13
TNL 125
c13
TNL 80
st2
TNL 125
a14
TNL 125
b14
TNL 125
c14
TNL 80
st3
TNL 125
a15
TNL 125
b15
TNL 125
c15
TNL 80
st4
TNL 125
a16
TNL 125
b16
TNL 125
c16
TNL 80
A1
TNL 200
B1
TNL 200
C1
TNL 145
D1
TNL 145
ST1
TNL 125
BR1
TNL 125
A2
TNL 200
B2
TNL 200
C2
TNL 145
D2
TNL 145
ST2
TNL 125
BR2
TNL 125
A3
TNL 180
B3
TNL 180
C3
TNL 145
D3
TNL 145
BR3
TNL 125
A4
TNL 180
B4
TNL 180
C4
TNL 145
D4
TNL 145
BR4
TNL 125
A5
TNL 145
B5
TNL 145
C5
TNL 145
D5
TNL 145
BR5
TNL 125
A6
TNL 145
B6
TNL 145
C6
TNL 145
BR6
TNL 125
AI
TNL-400
BI
TNL-400
CI
TNL-280
DI
TNL-280
STI
TNL 145
BRI
TNL 180
AII
TNL-400
BII
TNL-400
CII
TNL-280
DII
TNL-280
BRII
TNL 180
AIII
TNL-280
BIII
TNL-280
CIII
TNL-280
BRIII
TNL 180
AI
sub
Dyneema
6mm
BRI
TNL-400