DAVINCI GLIDERS DUET User manual

DAVINCI GLIDERS / DUET
1
for TANDEM
REV. 4
5 August 2017
Davinci Products Inc.
53 Sinchon-gil, Okcheon-myeon, Yangpyeong-gun, Gyeonggi-do, South Korea. (12505)
Tel. [phone] Fax. [phone]
[email protected] , [email protected]

DAVINCI GLIDERS / DUET
1
Thank you for choosing the DUET.
he 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 ight character-
istics, landing procedures, dealing with emergency situa-
tions 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 satis-
factory ying times.
WARNING!
THIS IS NOT TRAINING MANUAL. ATTEMPTING TO FLY THIS
OR ANY OTHER PARAGLIDER WITHOUT PROPER INSTRUC-
TION FROM A CERTIFIED PROFESSIONAL INSTRUCTOR IS
EXTREMELY DANGEROUS TO YOURSELF AND BYSTANDERS.
DAVINCI GLIDERS are carefully manufactured and inspect-
ed at the factory. Please use the glider only as described in
this manual.
Do not make any modications to the glider.
As with any sport – without taking the
necessary safety precautions, paragliding can be danger-
ous.
Congratulations!
15pt
-DAVINCI GLIDERS TEAM-

DAVINCI GLIDERS / DUET
2
INDEX
1. Technical DATA
2. Materials DATA
3. Introduction and
Pilot Target
4. Risers
5. Lines
6. Trimmers
7. Pre-ight check
8. Take-0ff
9. In ight characteristics
10. Deations
10.2 Frontal collapse
10.3 Full stall
10.1 Asymmetric collapse
10.5 Asymmetrical stall
10.6 B stall
10.7 Cravat
12
11
10
9
7
6
5
4
3
10.4 Deep stall
14. Packing your DUET
15. Maintenance and
cleaning
16. Caring tips
13. Landing
17. Warrantee
18. Respecting nature
and environment
11.2 Spiral dive
11. Descent Techniques
12. Special Flying
11.1 Big ears
11.1 Big ears
12.1 Towing
12.2 Acrobatic ight
8

DAVINCI GLIDERS / DUET
3
1. Technical DATA
15pt
DUET 41
CELLS
NUMBER 54
CLOSED 10
FLAT
AREA m² 41.1
SPAN m 14.8
ASPECT RATIO 5.4
PROJECTED
AREA m² 35.2
SPAN m 11.8
ASPECT RATIO 3.94
FLATTENING % 14
CORD
MAX m 3.49
MIN m 0.13
AVER m 2.78
LINES
HEIGHT m 8.99
MAIN 2+1/4/3/2
RISERS
NUMBER 4 A+A’/B/C/D
TRIMS mm 110
ACCELERATOR No
WEIGHT RANGE MIN-MAX KG 120-212
CERTIFICATION EN-926-1/2
LTF KG EN-B
GLIDER WEIGHT KG 6.7

DAVINCI GLIDERS / DUET
4
2. Materials DATA
15pt
CANOPY FABRIC CODE SUPPLIER
UPPER SURFACE Skytex 38/32 PORCHER IND
BOTTOM SURFACE Skytex 32 PORCHER IND
PROFILES 32 Hard MYUNGJIN TEX
DIAGONALS 32 Hard MYUNGJIN TEX
RISERS FABRIC CODE SUPPLIER
MATERIAL WEBBING 20MM GUTH&WOLF GMBH
PULLEYS RIELY LW RILEY PTY LTD
SUSPENSION LINES FABRIC CODE SUPPLIER
UPPER CASCADES PPSL 160/120 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 6843-160 EDELRID
UPPER BRAKE DSL 70 LIROS
UPPER MIDDLE BRAKE PPSL-120 LIROS
LOWER MIDDLE BRAKE PPSL-200 LIROS
MAIN BREAK 7850X-240 EDELRID

DAVINCI GLIDERS / DUET
5
3. Introduction and Pilot Target
4. Risers
15pt
DUET has 4 risers. The A riser has a red cover to easy
identication. There is another line with red mailon.
There is A’ and is for the big ears.
The DUET is a tandem paraglider
suitable for both commercial and
entering of tandem ying. You must be in possession of the appropriate licence and
insurances to y with passengers.
Standard
[mm]
Trim opened
[mm]
Travel length
[mm]
A400 400 0
B400 427 27
C400 482 82
D400 510 110
The DUET has been classied 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.
You must do not
- Be own with more than the
maximum certied total weight
- Be towed with a tow line tension in
excess of 200kg

DAVINCI GLIDERS / DUET
6
15pt 5. Lines
6. Trimmers
7. Pre-ight check
They come in different diameters of Kevlar and Dyneema with sheathed cover. They must to be
inspected every 100 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 ight or any brake lines is cut you can use the D riser softly for directional control instead
of brake line.
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 inate without any overshooting.
As a result, the take off characteristics are very smooth, straightforward, easy, forgiving and
require no special skills.
You can be accelerated in ight using the trimmers which make low angle of attack and increase
the ying speed. DUET trimmers provide you with more satisfying ight 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 ight of the wing
in case of collapse.
To know yourself with the glider it is a good idea to perform practice inations and ground
handling in advance.
You should have no diculties ying the DUET for the rst 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.

DAVINCI GLIDERS / DUET
7
15pt 8. Take-0ff
9. In ight characteristics
DUET has easy ination 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 at ground. While inating the DUET, you should
hold both of th A risers on your hands. Smoothly and gradually inate 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.
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 rst turns should be gradual and progressive.
To make efcient and coordinated turns with the DUET rst look in the direction you want to
go and check that the airspace is clear. Your rst 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
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!

DAVINCI GLIDERS / DUET
8
15pt
10.2 Frontal collapse
10.3 Full stall
DUET does not come out the symmetrical front collapse by itself. It has high
internal pressure with its well designed prole. 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 ight.
Full stall can occur when you fully pull the both brakes enough long time.
To recover to the normal ight you must release both brakes. After this
usually comes a front dive with a possible front deation. 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
ight weight. For the DUET it has minimum of 65cm 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 ight, 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. Deations
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 brake to control your direction. And you
should use the brake to re-inate the glider.
In spite of the DUET has great stability of the ight, strong turbulence or piloting error may
cause a portion of the wing suddenly to be a deation.

DAVINCI GLIDERS / DUET
9
15pt
10.5 Asymmetrical stall
10.6 B stall
10.7 Cravat
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
ying situations. In order to get out of asymmetrical stall, just release the
brakes. There may follow side thrust forward with a following wing collapse.
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.
In case a cravat should occur from an asymmetric collapse or other
manoeuvres, it is important to keep your ying 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.
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; ying the
glider when wet; or after a front/symmetric deation.
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 ight.

DAVINCI GLIDERS / DUET
10
15pt
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.
The DUET does not experience any problem when being towed. Only qualied
personnel should handle the qualied equipment to carry out this operation.
The wing has to be inated in the same way as in normal ight.
The DUET HAS NOT been designed for acrobatic ight and we DO NOT
recommend continued use in this type of ight. We consider acrobatic ight
to be any form of piloting that is different to normal ight. To learn safely
how to master acrobatic manoeuvres you should attend lessons which are
carried out by a qualied 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 ight. If you do practice
extreme manoeuvres we recommend that you submit your wing to a line
revision every six months.
11. Descent Techniques
12. Special Flying
11.1 Big ears
12.1 Towing
12.2 Acrobatic ight
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 ight, 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.

DAVINCI GLIDERS / DUET
11
15pt
14. Packing your DUET
15. Maintenance and cleaning
16. Caring tips
The DUET need be folded cell to cell to keep the plastic reinforcement at the leading edge lie
at 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)
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.
- 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 re
- Do not put anything heavy on your glider, do not pack it in a rucksack too tightly.
- Regularly inspect the canopy, lines, risers and harness. If you nd 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
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 ground you have to turn around with your
passenger to face the glider and move towards it during full pulling break symmetrically.

DAVINCI GLIDERS / DUET
12
15pt 17. Warrantee
18. Respecting nature and environment
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 100 hours of ying time (whichever comes rst); Those inspection must be made by
manufacturer, importer, distributor, dealer or other authorised persons. The checking must be
proven by a stamp on the certication sticker on the glider as well in the manual book.
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 ofces. We will undertake to recycle the glider.

DAVINCI GLIDERS / DUET
13
A B C D E Brake
19016 8929 8969 9120 9185 9890
28933 8838 8870 9022 9083 9525
38969 8880 8921 9079 9136 9256
48930 8857 8900 9063 9120 9130
58853 8779 8818 8970 9021 8941
68831 8756 8800 8957 9005 8806
78860 8802 8857 9011 9052 8750
88692 8660 8715 8796 8783
98552 8531 8583 8655 8688
10 8410 8409 8462 8540 8630
11 8304 8323 8379 8455 8600
12(STABLE) 8124 8080 8120 8195 8500
13(STABLE) 7977 8020 8075 8445
Checked line sheet(with riser)
Overview
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.

DAVINCI GLIDERS / DUET
14
Name Manufacturer Name Manufacturer Name Manufacturer Name Manufacturer Name Manufacturer Name Manufacturer
a1 PPSL 160 b1 PPSL 160 c1 PPSL 160 d1 PPSL 120 e1 PPSL 120 br1 DSL70
a2 PPSL 160 b2 PPSL 160 c2 PPSL 160 d2 PPSL 120 e2 PPSL 120 br2 DSL70
a3 PPSL 160 b3 PPSL 160 c3 PPSL 160 d3 PPSL 120 e3 PPSL 120 br3 DSL70
a4 PPSL 120 b4 PPSL 120 c4 PPSL 120 d4 PPSL 120 e4 PPSL 120 br4 DSL70
a5 PPSL 120 b5 PPSL 120 c5 PPSL 120 d5 PPSL 120 e5 PPSL 120 br5 DSL70
a6 PPSL 120 b6 PPSL 120 c6 PPSL 120 d6 PPSL 120 e6 PPSL 120 br6 DSL70
a7 PPSL 120 b7 PPSL 120 c7 PPSL 120 d7 PPSL 120 e7 PPSL 120 br7 DSL70
a8 PPSL 120 b8 PPSL 120 c8 PPSL 120 d8 PPSL 120 br8 DSL70
a9 PPSL 120 b9 PPSL 120 c9 PPSL 120 d9 PPSL 120 Dmain A7343-280 br9 DSL70
a10 PPSL 120 b10 PPSL 120 c10 PPSL 120 d10 PPSL 120 br10 DSL70
a11 PPSL 120 b11 PPSL 120 c11 PPSL 120 d11 PPSL 120 at1 PPSL 120 br11 DSL70
a12 PPSL 120 b12 PPSL 120 c12 PPSL 120 d12 PPSL 120 at2 PPSL 120 br12 DSL70
a13 PPSL 120 b13 PPSL 120 c13 PPSL 120 br13 DSL70
D1 PPSL 160 STM A6843-160
D2 PPSL 160 BR1 PPSL 120
A1 PPSL 200 B1 PPSL 200 C1 PPSL 160 D3 PPSL 160 BR2 PPSL 120
A2 PPSL 200 B2 PPSL 200 C2 PPSL 160 D4 PPSL 160 BR3 PPSL 120
A3 PPSL 160 B3 PPSL 160 C3 PPSL 160 D5 PPSL 160 BR4 PPSL 120
A4 PPSL 160 B4 PPSL 160 C4 PPSL 160 D6 PPSL 160 BR5 PPSL 120
D7 PPSL 160 BR6 PPSL 120
AI A7343-420 BI A7343-420 CI A7343-280 D8 PPSL 160
AII A7343-420 BII A7343-420 CII A7343-280 D9 PPSL 160 BRI PPSL 200
AIII A7343-280 BIII A7343-280 CIII A7343-280 BRII PPSL 200
DI A7343-280 BRIII PPSL 200
DII PPSL 160
DIII PPSL 160 BRI 7850X-240

DAVINCI GLIDERS / DUET
15
15pt
Serial Number
Date of Production
Dealer
Date of sales
Check and repair information