DUC Hélices SWIRL-2 User manual

Aérodrome de Villefranche Tarare (LFHV)
289 Avenue Odette & Edouard DURAND
69620 FRONTENAS - FRANCE
Phone : + 33 (0)4 74 72 12 69 - Fax : [phone]
E-mail : [e-mail] - www.duc-helices.com
ISO 9001:2008 Certified Company
for its Quality System Management
DH_SW2_BE_02_D Made in France 22/03/2017
Instruction manual
SWIRL-2 propeller range

This instruction manual is to be maintained throughout the life of the propeller.
He may have to evolve. The owner must check with the DUC Hélices company
the latest version being valid applicable to the propeller.
Revision update
Date
Index
Object of modification
23/12/2014
A
Creation in English
20/01/2015
A
Minor correction
02/04/2015
B
Update of the hub
01/06/2015
C
Update
22/03/2017
D
New address

Identification
Date
Delivery note n°
Owner
Engine/Gearbox
ratio
Aircraft
1st recommended
pitch blade angle
Notes: ..............................................................................................................................................................................
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..........................................................................................................................................................................................
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Performances
PITCH (°) at
25cm from the
tip of the
blade
TAKE-OFF
DISTANCE
(m)
CLIMB RATE
(ft/min or m/s)
SLOW
CRUISE
(km/h & rpm)
VARIOUS
CRUISE
(km/h & rpm)
FAST
CRUISE
(km/h & rpm)
FULL
THROTTLE
VARIO 0
(km/h & rpm)
Notes (Date, Number of people, Weight, Weather, …): ..............................................................................................
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Notes (Date, Number of people, Weight, Weather, …): ..............................................................................................
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Notes (Date, Number of people, Weight, Weather, …): ..............................................................................................
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Summary
1. Presentation of the SWIRL-2 propeller......................................................................................................................5
1.1. Description ........................................................................................................................................................5
1.2. Characteristics..................................................................................................................................................5
1.3. Shielding leading edge in Inconel .....................................................................................................................6
1.4. Accessories......................................................................................................................................................6
1.1. Sales reference.................................................................................................................................................6
2. Applications................................................................................................................................................................7
3. Installation precautions..............................................................................................................................................7
4. Components of the SWIRL-2 propellers....................................................................................................................8
4.1. Mounting configuration of the SWIRL-2 propellers...........................................................................................8
4.2. Mounting screws ...............................................................................................................................................8
4.3. Exploded view for propeller...............................................................................................................................9
4.4. List of required tools..........................................................................................................................................9
5. Assembly instruction of the propeller.......................................................................................................................10
5.1. Assembly of the propeller................................................................................................................................10
5.2. Installation on the aircraft................................................................................................................................11
5.3. Setting of the propeller & Finalization of the installation.................................................................................14
6. Precautions..............................................................................................................................................................17
7. Indications for testing...............................................................................................................................................17
8. Installation without spinner or with spinner other than DUC....................................................................................18
9. Potential use & Propeller maintenance....................................................................................................................18
9.1. Potential use of the propeller: Unlimited .........................................................................................................18
9.2. Propeller maintenance schedule.....................................................................................................................18
9.1. Regular maintenance (by the user).................................................................................................................19
9.2. General maintenance (by the user or an aeronautics workshop)...................................................................19
9.3. Complete maintenance (by DUC Hélices) ......................................................................................................20
10. General terms of sale...............................................................................................................................................20
10.1. Ordering procedure.........................................................................................................................................20
10.2. Delivery ...........................................................................................................................................................20
10.3. Price ................................................................................................................................................................20
10.4. Right of withdrawal..........................................................................................................................................20
10.5. Warranties.......................................................................................................................................................20
10.6. Privacy Policy..................................................................................................................................................20
10.7. Litigation..........................................................................................................................................................20
11. Annexes...................................................................................................................................................................21
11.1. Dimension of the engine propeller-shaft .........................................................................................................21
11.2. Airfoil ...............................................................................................................................................................22
11.3. Moment of inertia of the SWIRL-2 propeller....................................................................................................22
11.4. Operating limitation of the SWIRL-2 propeller ................................................................................................22
11.5. Identification marking of the propeller.............................................................................................................22
11.6. Declaration of conformance of the SWIRL-2 propellers..................................................................................23

SWIRL-2
5/24
1. Presentation of the SWIRL-2 propeller
1.1. Description
The SWIRL-2 propeller range has a new innovative design, specific
about its twisting axis and center of pressure.
Its aerodynamic design allows a "constant speed" effect, limiting
variations in engine speed between on ground and in flight.
These propellers allow for high efficiency throughout the flight envelope i.e.:
Improved takeoff and climb rate due to higher engine speed, then higher engine efficiency
Many cruise extension
A high user comfort
The blades and the hub of the SWIRL-2 propeller range are manufactured according the DUC Hélices company
technologies, from unidirectional layers of carbon fibers prepreg epoxy resin.
Their composite structures are defined to obtain the maximum stresses in torsion
and bending. Therefore "constant speed" effect is not related to deformation of the
blade but its geometry and specific profile.
Due to its specific geometric definition, excellent performance is obtained in
both aerodynamic and acoustic, but also in consumption.
1.2. Characteristics
The SWIRL-2 propeller range is available:
Tractor configuration (available in right rotation)
Diameters Ø1520, Ø1620, Ø1660, Ø1730, Ø1830mm and others tailor made
Ø59.8 Ø63.8 Ø65.4 Ø68.1 Ø72"
Two-blade & Three-blade –SWIRL-2 3.20 & 4.17 kg (7.05 & 9.19 lb.)
SWIRL-2-R 3.30 & 4.32 kg (7. 28 & 9.52 lb.)
Shielded leading edge in Inconel®
Carbon composite hub Ø101.6mm (Ø4”) with metallic inserts
or carbon composite hub Ø75mm
2-blade hub available in Compact version for Ø210mm spinner
Direct assembly on the propeller-shaft Ø101.6mm (Ø4”)
Excellence version “SWIRL-2-R”for direct drive engine from 100hp to 140hp:
Longitudinal reinforced carbon structure
Higher bending strength
Titanium color finishing
Advanced controls
rpm
efficiency ƞ
rpm
efficiency ƞ

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1.3. Shielding leading edge in Inconel
The leading edge of the SWIRL-2 blades is equipped with a metallic shielding in Inconel®. This material is a superalloy
containing mainly nickel, with a very high hardness of surface.
1.4. Accessories
Aluminum mounting spacer (Direct mounting on P.C.D Ø101.6mm/Ø4”)
Moves the plane of the propeller to adjust the position according the engine hood
Aluminum adaptor spacer (Other mounting as SAE1, SAE2, …)
Move the propeller plane and adaptor the P.C.D fixation of the propeller
Spinner available: Ø210 (Ø8.3"), Ø250mm (Ø9.8"), Ø260mm (Ø10.3"),
Ø300mm (11.8”) & Ø340mm (Ø14.4”)
Adjusting tool for the setting of the pitch angle of the blades
Neoprene cover protection of the blade
Cleaning treatment for composite propellers
Save money! A clean propeller is more efficient and decreases the fuel consumption.
1.1. Sales reference
Preview
Designation
Reference
Part number
Ø101.6mm (4") Compact hub –Fixingwith 6 screws CHC M8 withØ13 or 14mm drive lug
Two-blade Inconel SWIRL-2 propeller, Right (Compact hub)
01-28-001
H-SW2_2-D-I_MFU
Two-blade Inconel SWIRL-2-R propeller, Right (Compact hub)
01-37-001
H-SW2_2-D-R_I_MFU
Ø101.6mm (4") hub –Fixing with 6 screws CHC M8 with Ø13 or 14mm drive lug
Two-blade Inconel SWIRL-2 propeller, Right
01-36-001
H-SW2_2-D-I_MF
Two-blade Inconel SWIRL-2-R propeller, Right
01-31-001
H-SW2_2-D-R_I_MF
Three-blade Inconel SWIRL-2 propeller, Right
01-33-001
H-SW2_3-D-I_MF
Three-blade Inconel SWIRL-2-R propeller, Right
01-32-001
H-SW2_3-D-R_I_MF
Note:
Specify the flight regulation aircraft (E.g.: Ultra-light, LSA…) and diameter when ordering (E.g.: ref. 01-28-001/1730).
For more information about the propeller marking, see section 11.5.
Inconel shielding

SWIRL-2
7/24
2. Applications
The DUC propellers have an unlimited flight potential in normal operation. To keep the unlimited potential,
DUC Hélices defined a TBO (Time Between Overhaul) for a propeller depending on its engine.
Refer to section 9. Potential use & Propeller maintenance for more information.
Engine
Type
Gear
box
Recommended propeller
Propeller
diameter
(inch)
Blade
angle
(°)
Blade
angle
allowed
range(°)
TBO
(hour)
3 AXIS –TRACTOR
JABIRU 2200
4 strokes
-
Two-blade Inconel SWIRL-2, right
Ø1620
18°
15° → 23°
2000h
JABIRU 3300
4 strokes
-
Two-blade Inconel SWIRL-2-R, right
Ø1660
19°
16° → 24°
UL Power 260i/iS
4 strokes
-
Two-blade Inconel SWIRL-2, right
Ø1620
18°
15° → 23°
UL Power 350i/iS
4 strokes
-
Two-blade Inconel SWIRL-2-R, right
Ø1660
20°
17° → 25°
Continental O-200
4 strokes
-
Three-blade Inconel SWIRL-2-R, right
Ø1660
19°
17° → 25°
Lycoming O-235
OTHER APPLICATIONS
For all other applications, thank you to contact the DUC Hélices company to study the possibility of adapting the
SWIRL-2 propeller.
* Ø1850mm = 72.83"; Ø1730mm = Ø68.12»; Ø1660mm = Ø65.4»; Ø1620mm = Ø63.8»; Ø1520mm = Ø59.8"
Remark
The values of the pitch angle are theoretical and associated with the engine. This setting should be adjusted
according to the aircraft (see section 7. Indications for testing).
For proper use of the propeller, refer to section 9. Potential use & Propeller maintenance.
3. Installation precautions
WARNING Make sure the ignition is turned off before starting any type of operation on the propeller.
Do not run the engine without propeller, engine damage will result.
IMPORTANT The blades of a propeller are part of a whole. DO NOT INTERCHANGE with other similar blades
from propeller. The propeller blades are manufactured to their application. Their structure, weight and
balance are different from a propeller to another.
The spinner is an important element for cooling the engine. The aircraft must not fly without a spinner.
Fitting a different spinner will be an addendum to this manual approved by the DUC to confirm its compatibility with the
mounting of the propeller.
The propeller is delivered with the appropriate screws. The change of the screws is contrary to our
recommendations unless validated by the manufacturers.
WARRANTY CONDITIONS The user is still flying under its full responsibility (see 10. General terms of sale).

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4. Components of the SWIRL-2 propellers
The SWIRL-2 propellers are available in several versions and can be mounted on different model of engine.
4.1. Mounting configuration of the SWIRL-2 propellers
Here is a configuration table of the SWIRL-2 propeller mounting according the propeller-shaft of the engine.
If needed, see annex 11.1. Dimension of the engine propeller-shaft.
MOUNTING
ENGINE PROPELLER-SHAFT
Ø4" / Ø101.6mm
(Ex: Jabiru)
Type SAE 1
Ø4-3/8" /
Ø111.125mm
(Ex: Continental O-
200)
Type SAE2
Ø4-3/4" / Ø120.65mm
(Ex: Lycoming O-360)
Other
≠Ø101.6mm
direct on propeller-
shaft (without
spacer)
X
with spacer
X
with adaptor
spacer
X
X
X
4.2. Mounting screws
Coming soon.

SWIRL-2
9/24
4.3. Exploded view for propeller
Remark
This exploded view shows the principle of the SWIRL-2 propeller assembly. The size of all of these components
changes depending on the configuration of the propeller (diameter hole of the metallic inserts of the half-hub, length of
the screws…).
4.4. List of required tools
Jabiru mounting
SAE1/SAE2 mounting
M8 Torque Hex key (Tightening: 25 Nm)
M8 Torque Wrench (Tightening: 25 Nm)
Inclinometer (pitch adjusting tool)
Plastic mallet
Torque Screwdriver (Tightening: 4 Nm)
M8 Torque Hex key (Tightening: 25 Nm)
M8 Torque Wrench (Tightening: 25 Nm)
3/8 or 1/2 Torque Wrench (Tightening range: 30 to 45 Nm)
Inclinometer (pitch adjusting tool)
Plastic mallet
Torque Screwdriver (Tightening: 4 Nm)
SWIRL-2
blade
(x2 or x3)
Screws & washers
for hub assembly (x6)
Hub camping washer (x1)
Locking nuts & washers
for hub assembly (x6)
Rear half-hub (x1)
with rear metallic inserts (x6)
Fixing screws and washers of the propeller
adapted according the mounting (x6)
Internal hub spacer (x1)
Caution when handling the blades
CUTTING TRAILING EDGE
Front half-hub (x1)
with front metallic inserts (x6)

10/24
5. Assembly instruction of the propeller
The assembly of the SWIRL-2 propellers is shown below. It is recommended to assemble the propeller on a worktable
before installing it on the plane. The procedure is the same for two-blade and three-blade SWIRL-2 propellers.
For further information, contact the DUC Hélices Company.
5.1. Assembly of the propeller
STEP
1.
Place the rear half-hub on a worktable.
Be careful not to invert with the front hub half.
Depending on your installation, the rear half-hub is one
mounted on the propeller-shaft of the engine or on a
spacer. The holes of the metal inserts of the rear half-
hub are higher than the holes of the metal inserts of the
front half-hub.
STEP
2.
Place the hub spacer in the center of the rear half-hub.
STEP
3.
Positioning the blades in their hub slots by placing them
outwards.
Orient the DUC Hélices logo facing you.
Note that the metal inserts of the half-hub allow a
locking of the blades in their axis within the hub.
STEP
4.
Place the front half-hub (metal insert with small hole)
on the set to fit with the blade foots.
STEP
5.
From the front hub, set up the 6 screws and washers
for hub assembly. At the rear, place washers and lock
nuts.
Perform initial moderate tightening.
STEP
6.
Place the hub clamping washer on the front of the
propeller hub (side logo).
Be sure the direction of the clamping washer
(rounded edge outwards).
Place the 6 fixing screws and their washer.
In the case of pin contact washers (Jabiru
mounting), the pins are oriented towards the screw
head.
Compact Hub version

SWIRL-2
11/24
5.2. Installation on the aircraft
As presented in section 4.1. Mounting configuration of the SWIRL-2 propeller, several mounting are possible:
1. Installing directly on propeller-shaft of the engine
2. Use a spacer for spacing propeller from the propeller-shaft
3. Use an adaptor spacer to adjust the diameter fixing of the propeller and for spacing the propeller from the
propeller-shaft
5.2.1.Direct installation on the aircraft
The direct installation of the SWIRL-2 propeller is possible only with the following conditions:
Engine propeller-shaft type Jabiru (6 indexing paws Ø14mm on P.C.D. Ø101.6mm/Ø4")
Engine propeller-shaft out of the engine hood of 14mm for the mounting of the DUC spinner
If needed, see in annex 11.1. Dimension of the engine propeller-shaft.
Remark: All engines having a propeller-shaft with a P.C.D. Ø101.6mm/Ø4" can install the SWIRL-2 propeller directly.
The holes of the metal inserts of the rear half-hub must be adapted to suit with the indexing paws of the
propeller-shaft. For further information, contact the DUC Propellers.
Assembly of the two-blade or three-blade hub:
Propeller fixing:
Screws CHC M8 & pin contact washer (length adapted
according the indexing paws of the propeller-shaft)
Ø8 hole paws (Ex: JABIRU): Screw CHC M8x140mm
5.2.2.Use of a spacer
14 mm
min.
5 mm min.
TIGHTENING TORQUE
2,5 Kg/m 25 N.m
TIGHTENING TORQUE Screw M6: 1,1Kg/m; 11N.m
TIGHTENING TORQUE Screw M6: 1,1Kg/m; 11N.m
Screw M6 if Compact Hub version

12/24
A spacer is necessary in the following case:
Engine propeller-shaft type Jabiru (6 indexing paws Ø14mm on P.C.D. Ø101.6mm/Ø4")
Engine propeller-shaft placed inside the engine hood or not place at more than 14mm
Determination of the spacer length:
Measure the distance X between the propeller-shaft and the engine hood limit, then add 14mm.
Available spacer:
Engine
Model
Length
JABIRU
JABIRU spacer
3, 6, 10, 20, 30, 45, 50, 70mm
Presentation of the installation
Assembly of the two-blade or three-blade hub
Propeller fixing:
Screw CHC M8 & pin contact washer (screw length adapted
according the length of the spacer)
Consult the installation instructions of the spacer for
more information.
TIGHTENING TORQUE Screw M6: 1,1Kg/m; 11N.m
TIGHTENING TORQUE Screw M6: 1,1Kg/m; 11N.m
X
14 mm min.
TIGHTENING TORQUE
2,5 Kg/m 25 N.m
Propeller-shaft not
outside the engine hood
Screw M6 if Compact Hub version

SWIRL-2
13/24
TIGHTENING TORQUE 2.5 Kg/m 25 N.m
Consult the installation instructions of
the adaptor spacer for more
information.
5.2.3.Use of adaptor spacer
An adaptor spacer is necessary in the following case:
Engine propeller-shaft different than the type Jabiru (other than P.C.D. Ø101.6mm/Ø4")
If needed, see in annex 11.1 Dimension of the engine propeller-shaft.
Determination of the adaptor spacer length:
Measure the distance X between the propeller-shaft and the limit of the engine hood, then add 14mm.
Available adpator spacer:
Engine
Model
Length
Continental O-200 / Lycoming O-233
SAE1 adaptor spacer
30, 70, 100mm
Lycoming O-360
SAE2 adaptor spacer
30, 70, 100mm
Presentation of the installation
Assembly of the two-blade or three-blade hub
Fixation of the adaptor spacer
SAE1: Screw AN6 / SAE2: Screw AN8
(screw length adapted according the
adaptor spacer length and the starter
flange on the propeller-shaft)
Propeller fixing:
SAE1: Screw AN6-51 / SAE2: Screw AN8-51
Remark: It is imperative to use a spinner when using propeller SWIRL-2.
The mounting plate of the spinner can be placed before or after the spacer
adaptation. It is necessary to adapt the mounting in function of its position.
Propeller-shaft not
outside the engine hood
14 mm min.
TIGHTENING TORQUE
ADAPTOR SPACER
AN6 (3/8"): 3.0 Kg/m 30 N.m
AN8 (1/2"): 4.5 Kg/m 45 N.m
TIGHTENING TORQUE
PROPELLER FIXING
AN6 (3/8"): 3.0 Kg/m 30 N.m
AN8 (1/2"): 4.5 Kg/m 45 N.m

14/24
5.3. Setting of the propeller & Finalization of the installation
At this point, the propeller is installed on your aircraft with the spinner mounting
plate.
If the propeller is already assembled and the blades angle set, pass directly
STEP 7.
Otherwise, follow all the steps below to adjust the pitch angle before the final
tightening of the screw.
A reminder of the definition of the airfoil and its vocabulary is presented in annex
11.2. Airfoil.
STEP 1.
Side view
Front view
For the setting, the concerned blade must be place in horizontal position.
The setting is done with the adjusting tool flatten against the intrados (leading edge up) at 25 cm from the blade tip.
The attack angle is formed by the vertical and the intrados of the blade.
To do this, place your aircraft horizontally, so that the propeller shaft is perfectly vertical.
Check with the level of the adjustment tool (measured value = 90°). If unable to change the longitudinal axis of the
aircraft, raising the value of the Xangle propeller shaft plate to subtract the value of the blade angle to be
resolved.
90°
Propeller-
shaft plate
0°
90°
(90° - X)
25 cm

SWIRL-2
15/24
STEP 2.
Slightly untighten the propeller fixing screws and the M8
hub assembly screw.
Note :
M6 screw presence in the case of the Compact Hub
version.
STEP 3.
Horizontal blade, leading edge upward, place the adjustment tool at 25 cm from the tip of the blade, intrados
side (flat), handle down.
STEP 4.
Set the desired value of the adjustment tool.
Caution to apply the value Xif a correction of the aircraft plan was needed.
STEP 5.
Correct the position of the bubble on the adjustment tool by rotating the blade in the hub. To do this, using a mallet,
lightly tap on the foot of the blade in the desired direction.
Do not apply pressure near the trailing edge, thinner area.
The accuracy of the adjustment tool is 0.2°. This is defined by the tolerance of the
visual position of the bubble between the two lines.
Adjustment roller of the
leading edge
Reading blade angle
Intrados of the blade with the
leading edge upwards
Horizontal blade
25 cm

16/24
STEP 6. A
Once the desired pitch angle obtained, slightly tighten the M8 assembly screws of
the hub, those around the foot blade and then perform the same operation on
each of the other blades.
STEP 7.
Remove the adjusting tool from the propeller then perform a first tightening of the bolts manually.
Then, carry out a progressive tightening of all the screws by applying the correct torque with a torque wrench:
IMPORTANT
After a 1 hour operation following the installation or modification of the
assembly, recheck the assembly of your propeller according the instructions
manual using appropriate tools (tightening torque, pitch angle…).
STEP 8.
After a final verification (position and orientation of parts, tightening...), mount the spinner on the mounting plate by
tightening the spinner screws to a torque of 4Nm (0.4kg/m) with the appropriate tools.
In the presence of a marking, please respect the indexing of the spinner from its plate.

At this point, the SWIRL-2 propeller is ready for first tests.
The user must perform the appropriate regulations procedures
to change the propeller in accordance with applicable regulations of the aircraft.
TIGHTENING TORQUE
M8 screw for hub assembly = 25 Nm (2.5 kg/m)
M6 screw for hub assembly = 11 Nm (1.1 kg/m)
Propeller fixing screws
Direct mounting/Spacer
Adaptor spacer mounting
Screw CHC M8 = 25 Nm (2.5 kg/m)
Screw AN6 (3/8") = 30 Nm (3 kg/m)
Screw AN8 (1/2") = 45 Nm (4.5 kg/m)

SWIRL-2
17/24
6. Precautions
PRECAUTIONS
If you notice any abnormal installation or operation, do not undertake the flight and immediately contact the DUC
Hélices company.
Being aware of potential risks during assembly and initial testing of the propeller. Stay focused,
attentive and vigilant to your environment. Recheck several times points to be observed.
Maintaining high safety clearance during the set operation.
The products of the DUC Hélices company must be installed and used according to the instruction manuals provided.
No modification can be made without the agreement of DUC Hélices company. The non-compliance of these data
assumes no responsibility for the DUC Hélices company and makes out the warranty of the considered products (See
section 10. General terms of sale).
7. Indications for testing
INDICATIONS FOR TESTING
The tests are important. It is normal to make several adjustments successive alternating
ground and flight tests.
PRELIMINARY TEST to secure the 1st flight (Ground Test)
- Immobilized your aircraft, brakes locked. Apply the manufacturer's recommendations for safety.
- Turn the engine on, warm it up.
- Full throttle, the engine must be at least 85% of maximum engine speed recommended by the manufacturer in
flight. If this is not the case, adjust the blade pitch angle.
Increase pitch angle to reduce engine speed (and vice versa). 1° of pitch angle affects approximately 200 rpm engine
speed.
VALIDATION TEST of the pitch angle setting (Flight Test)
- Check all tightening. Take off and place the aircraft in stabilized flight, vario zero.
- To take off, it is not recommended to throttle, brake applied and then releases the brakes. You must put the
throttle gradually, brake released. The propeller has a constant speed effect, so this second way avoids
cavitation takeoff. Furthermore, this method allows shorter takeoffs.
- Full throttle, the maximum engine speed recommended by the manufacturer must be reached but not exceeded.
If this is not the case, adjust the blade pitch angle.
Increase pitch angle to reduce engine speed (and vice versa). 1° of pitch angle affects approximately 200 rpm engine
speed.
IMPORTANT
After a 1 hour operation following the installation or modification of the
assembly, recheck the assembly of your propeller according the instructions
manual using appropriate tools (tightening torque, pitch angle…).

18/24
8. Installation without spinner or with spinner other than DUC
In the case of installation of the propeller without spinner mounting plate or other
spinner mounting plate, be careful to check the following points:
Length of the fixing screws of the propeller: Must be adapted according
the thickness of the spinner mounting plate.
Mechanical resistance of the plate when tightening: For a similar
assembly of the DUC spinner, the plate takes the tightening of the
propeller fixing screws. It is therefore necessary to ensure that the used
plate can withstand the clamping and resist of the propeller operate efforts
(crushing of the plate).
IMPORTANT
The spinner is an important element for engine cooling.
The aircraft must not fly without propeller spinner. Mounting a different cone will be an amendment to this instruction
manual approved by the DUC in order to confirm its compatibility mounting the propeller.
WARRANTY CONDITIONS
The user is still flying under its full responsibility (see section 10. General terms of sale).
9. Potential use & Propeller maintenance
9.1. Potential use of the propeller: Unlimited
The DUC propellers have an unlimited flight potential in normal operation.
To keep the unlimited potential, DUC Hélices has defined a TBO (Time Between Overhaul) for a propeller depending
on its engine. This TBO according the engine is indicated in this manual (see 2. Applications). In all cases, it may not
exceed 5 years.
When more intensive use (flight school...), the value of the TBO can be doubled maintaining control at least every 2
years.
To achieve this, we propose to return the propeller to make a full control and ensure its proper use.
If no critical anomaly is detected, it is again credited with the same TBO and is returned to you.
As a reminder, there is no imperative logbook. But know that this control is offered as a service to our customers for
continuing airworthiness and there is no obligation. In fact, security will not be affected.
The deliveries costs of sending and returning will be payable by the customer.
9.2. Propeller maintenance schedule
Type
Actor
Frequency
Regular
User
Each pre-flight
General
user or an aeronautics workshop
Every 100 hours or annually
Complete
DUC Hélices company
Each TBO

SWIRL-2
19/24
9.1. Regular maintenance (by the user)
For a safety use of the SWIRL-2 propellers, it is necessary that the user performs regular maintenance to detect any
abnormalities. This maintenance is usually just a simple check.
Frequency of checking: Each pre-flight
Control methods: Visual inspection & Manual handling
Checkpoints:
- Fixation of the propeller: Manually maintaining the tip of a blade of the propeller, shake it firmly to feel if a
too much clearance appears in the setting of the propeller.
- Degradation of material: Check visually the entire propeller without dismantling (blade root, Inconel leading
edge, surface of the blade, spinner, hub, etc.)
- Fixation of the spinner: Check visually the fixation screws of the spinner. A marking paint can be made
between each screw and spinner to have a means of visual inspection of proper tightening the screws.
Possible problems:
- Too much clearance in the propeller fixation
- Surface degradation due to dirt or impact / Crack apparent
Corrective actions (depending on the importance):
1. Clean the propeller with the DUC cleaning treatment DUC (ref. 01-80-003)
2. Perform a repair with the DUC repair kit (ref. 01-80-004)
3. Tighten the screws to proper torque with wrench
4. Replace(s) damage component(s)
5. Contact DUC Hélices to define a solution
9.2. General maintenance (by the user or an aeronautics workshop)
A general maintenance by the user or an aeronautics workshop must be made at lower frequency.
Frequency of checking: Every 100 hours or annually
Control methods: Visual inspection & Torque wrench
Checkpoints:
- Fixation of the propeller: By removing the spinner of the propeller, check the proper tightening of the
screws to the wrench. These screws of the hub should be tightened to proper torque, defined in the
installation instructions attached.
A marking paint of all the screw/washer/hub after tightening can be done to help make a visual check
outside of the general maintenance.
- Degradation of material: Check visually the entire propeller (blade root, Inconel leading edge, surface of
the blade, spinner, hub, etc.)
Possible problems:
- Too much clearance in the propeller fixation
- Surface degradation due to dirt or impact / Crack apparent
Corrective actions (depending on the importance):
1. Clean the propeller with the DUC cleaning treatment DUC (ref. 01-80-003)
2. Perform a repair with the DUC repair kit (ref. 01-80-004)
3. Tighten the screws to proper torque with wrench
4. Replace(s) damage component(s)
5. Contact DUC Hélices to define a solution

20/24
9.3. Complete maintenance (by DUC Hélices)
Upon reaching the TBO (potential flight time between overhaul) defined by DUC Hélices, the propeller must be
returned to the corporation for a full inspection of all components of the propeller.
See section 2. Applications for the potential value of an hour's flight engine.
The possible degradation of the propeller components may vary depending on the location of use.
10.General terms of sale
10.1. Ordering procedure
Orders placed by fax, by phone or mail server engage the customer upon receipt by our Customer Service Order and
the Regulations.
10.2. Delivery
DUC Hélices Company agrees to make every effort to deliver the order within the shortest time, and the receipt of the order
together with the Regulation. The delivery times indicated on the order are only indicative and the possible delays do not entitle the
buyer to cancel the sale, to refuse the goods or claim damages. Any claim for non-compliance or failure will be sent within one
week following the date of receipt of order.
The DUC Hélices Company is released from its obligation to deliver for all fortuitous events or force majeure. As an indication, the
total or partial strikes, floods, fires are cases of force majeure. The transfer of ownership of goods supplied or delivered is
suspended until full payment of price by the customer and without affecting the transfer of risk.
10.3. Price
The DUC Hélices Company may change its prices at any time.
The customer agrees to pay the purchase price in effect at the time of order entry. Regulation Order is payable in advance in one
payment when sending the DUC Hélices Company purchase order.
10.4. Right of withdrawal
Under Article L121-16 of the Consumer Code, the customer shall have seven clear days after the delivery of his order to return the
products to the DUC Hélices Company for exchange or refund, without penalties except for the return costs. Returned products
must not have suffered modification, damage consequence of shock or improper use and be packaged in original packaging.
Goods shipped with postage due will not be accepted.
10.5. Warranties
The DUC Hélices Company's products must be installed and used in accordance with instruction manuals provided. No changes
can be made without the prior approval of the DUC Hélices Company. The failure of these data releases any liability of the DUC
Hélices Company and makes non-warranty the considered products.
The user is still flying under its sole responsibility.
The legal guarantee of industrial products is six months or for the potential duration of the helix (depends on which engine it is
installed) against defects and hidden defects. See the section 2. Applications to determine the potential value of an hour's flight
engine.
DUC Hélices Company guarantees its product defect under normal use in the manner described below: If the customer finds a
defect, he must report it immediately to the DUC Hélices and features of one months after its purchase to return to society DUC
Helices, all structural defects will snuff into account (except for damage result of incorrect operation, shock, injury, impairment or
neglect, water or generally inappropriate use by the engine type, power, speed and gear). To qualify for this warranty, the customer
must send at its expense within one month after its purchase to be returned to society with DUC Hélices delivery order attached to
the product. In return, the DUC Hélices Company takes no responsibility for damage or loss during transit due to improper or
inadequate packaging. The company DUC Propellers then returned at his expense to the customer at the address on the delivery
note, an identical or equivalent.
In addition to these guarantees, the company DUC Hélices provides no other warranties.
10.6. Privacy Policy
All the data you entrust to us are able to process your orders. Under Law No. 78-17 of January 6, 1978 relating to data, files and
freedoms you have with the customer service company DUC Hélices right to access, review, correct, correct and delete data you
have provided.
10.7. Litigation
Any order placed convincing the customer, without any restriction, the General Conditions of sale of the DUC Hélices Company.
Any dispute concerning the sale (price, GTS, product ...) will be subject to French law before the Tribunal de Commerce de Lyon.