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DUC Hélices COBRABLACK-R Instruction Manual

Hydraulic inflight variable pitch propellers
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Instruction Manual
Inflight Variable Pitch Propellers
COBRABLACK-R
Aérodrome Du Beaujolais (LFHV)
289 Avenue Odette & Edouard DURAND
69620 FRONTENAS - FRANCE
Phone : + 33 (0)4 74 72 12 69
ISO 9001:2015 Certified Company
E-mail : contact@duc-helices.com - www.duc-helices.com
for its Quality System Management
DH_COBPV-HY_BE_02_A
Made in France
23/09/2024

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Summary of Contents for DUC Hélices COBRABLACK-R

  • Page 1 Instruction Manual Inflight Variable Pitch Propellers COBRABLACK-R Aérodrome Du Beaujolais (LFHV) 289 Avenue Odette & Edouard DURAND 69620 FRONTENAS - FRANCE Phone : + 33 (0)4 74 72 12 69 ISO 9001:2015 Certified Company E-mail : contact@duc-helices.com - www.duc-helices.com for its Quality System Management...
  • Page 2 Revision update Date Revision Index Object of modification 19/09/2024 Creation 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.
  • Page 3 Identification Date Delivery note n° Engine/Gearbox Owner ratio Aircraft Pitch range Min : Max : Notes : ................................................................................................................................................... Performances STATIC TAKE OFF CLIMB RATE CRUISE FULL TH. ENGINE Distance (m) : VARIO ft/min or m/s SPEED km/h or kt in.Hg STATIC TAKE OFF...

  • Page 4: Table Of Contents

    12.2. Airfoil ....................................28 12.3. Moment of inertia ................................28 Operating limitation of the Hydraulic COBRABLACK-R propeller ..................28 12.4. 12.5. Identification marking of the propeller ..........................29 Declaration of conformance of the Hydraulic COBRABLACK-R propellers ............... 30 12.6. 4/32...
  • Page 5 COBRABLACK-R (Intentionally left blank) 5/32...

  • Page 6: Hydraulic Cobrablack-R Propeller

    Hydraulic COBRABLACK-R propeller 1.1. Description Hydraulic COBRABLACK-R propellers are innovative hydraulic variable pitch propellers of the latest generation achieving optimized performance for all phases of flight. They benefit from carbon / titanium blades and a carbon / aluminum hub manufactured using DUC Propeller technology.

  • Page 7: Shielding Leading Edge In Inconel

    COBRABLACK-R 1.3. Shielding leading edge in Inconel Hydraulic COBRABLACK-R The leading edge of the blades is composed of a metallic shielding in Inconel. This material is a superalloy including mainly nickel, with a very high hardness of the surface. In addition, the color decorations (DUC logo + blade tip) are integrated during molding in the composite structure using technology specific to DUC.

  • Page 8: Applications

    3-blade Inconel COBRA-R propeller, Right series OTHERS APPLICATIONS For all other applications, thank you to contact DUC Hélices company to study the possibility of adapting Hydraulic COBRABLACK-R propeller. Time Between Overhaul Remark The pitch angle’s value are theoretical and combined with the engine. This setting should be adjusted according to the aircraft.
  • Page 9 COBRABLACK-R First taxi tests and then fly tests of the propeller). For proper use of the propeller, refer to section 10. Potential use & Propeller maintenance. 9/32...

  • Page 10: Installation And Using Precautions

    3. Installation and using precautions RECOMMANDATION As recommended by the engine manufacturer, it’s strongly recommended to use variable pitch propeller with an aircraft equipped with a vacuum indicator on engine intake manifold (Pressure of the engine intake - PA) to know the engine load. Refer to your engine manual or the section. WARNING Make sure the ignition is turned off before starting any type of operation on the propeller.

  • Page 11: Technical Data Of Hydraulic Cobrablack-R Propeller

    COBRABLACK-R Hydraulic COBRABLACK-R 4. Technical data of propeller 4.1. Mounting Hydraulic COBRABLACK-R Here is a configuration table of the propeller mounting according the propeller-shaft of the engine. If needed, see annex Erreur ! Source du renvoi introuvable.. Erreur ! Source du renvoi introuvable..

  • Page 12: Exploded View Of The Propeller

    4.3. Exploded view of the propeller 12/32...

  • Page 13: Mounting Instruction Of The Hydraulic Cobrablack-R Propeller

    COBRABLACK-R Hydraulic COBRABLACK-R 5. Mounting instruction of the propeller Hydraulic COBRABLACK-R propeller is showed hereafter. It’s recommended to assembly the The mounting of the propeller on a table before to install it on the aircraft. The process is the same for the 2-blade or 3-blade propeller.

  • Page 14: Operator & List Of Necessary Tools

    Customer View Article Quantity Verification Back half-hub + 6x Tightening recovery column 6x holes AN6, AN7 or AN8 On PCD Ø4”3/4 (Ø120.65mm) Central hole Ø50mm Assembly nut for hub Nylstop nut M8 Blade neoprene cover protection 2 or 3 Instruction manual 5.2.

  • Page 15: Assembly Of The Propeller On Table

    COBRABLACK-R 5.3. Assembly of the propeller on table ↓ Check the steps gradually   STEP 1. STEP 2. Place the “engine back half-hub” (Central hole Laid the satellite in the back half-hub without fitted into Ø50mm) on a table.
  • Page 16   STEP 5. STEP 5. Place the Screws AN5-12A + Washer over the top and Add the safety return spring in low pitch. the Nylstop nut behind for the assembly of the 2 half-hubs. Make a first tightening to approach the screws. Check if the blades are well placed in their place.

  • Page 17: Installation On The Aircraft

    COBRABLACK-R 5.4. Installation on the aircraft As presented in section 4.1 Mounting, several mountings are possible: 1. Installing directly on propeller-shaft of the engine 2. Use a spacer for spacing propeller from the propeller-shaft 5.4.1. Direct installation on the aircraft...
  • Page 18 5.4.2. Use of a spacer A spacer is necessary in the following case:  Engine propeller-shaft SAE2-AN6, SAE-N7 or SAE2-AN8 on 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.

  • Page 19: Tightening Torque

    COBRABLACK-R   STEP 9. STEP 10. Now, make a progressive tightening in cross in 2 or Gradually tighten in 2 or 3 times the 6 CHC M8 3 times to reach the tightening torque 25 N.m. propeller fixing screws at 20 Nm.
  • Page 20 5.4.3. Bleeding the hydraulic system When the governor, its cable control and the hydraulic propeller are completely installed, it is then necessary to perform the hydraulic purge of the system to expel the air and make the propeller pitch control 100% functional. PROCEDURE 1) Heat the engine and oil to operating temperature 2) Then set the propeller pitch control to the "RPM Mini / Coarse pitch"...

  • Page 21: Setting The Small Pith Stop And And Static Tests On Ground Of The Propeller

    COBRABLACK-R 6. Setting the small pith stop and and static tests on ground of the propeller The preliminary tests are important 1) Tight the small-pitch stop (M10 nut) to let a clearance of 1mm with the tightening washer. 2) Placed the pitch control of the propeller in position "RPM Max / Small step"...
  • Page 22 8) Replace the pitch controller in small-pitch position to reduce the pitch to the maximum. 9) When everything is set, set up the safety wire Ø0.8mm (Ø0.03") over the screw heads for safe installation. 10) After a final check (position and orientation of parts, tightening, ...), install the spinner on the spinner mounting plate by tightening the screws to a torque of 4 Nm (0.4kg / m) with the appropriate tools.

  • Page 23: First Taxi Tests And Then Fly Tests Of The Propeller

    COBRABLACK-R 7. First taxi tests and then fly tests of the propeller During the Vital Action (A-C-H-E-V-E-R) before each flight, it is recommended to check the proper functioning of the pitch variation of the propeller. Before the first flights, do a run-up to get 2600 rpm. If not, change the setting of the fine-pitch stop.

  • Page 24: Potential Use & Propeller Maintenance

    10. Potential use & Propeller maintenance 10.1. Potential use of the propeller: Unlimited The propellers DUC have an unlimited flight potential in normal operation conditions. To keep the unlimited potential, DUC Propellers Company has defined a TBO (Time Between Overhaul) for a propeller depending on its engine.

  • Page 25: General Maintenance (By The User Or An Aeronautics Workshop)

    COBRABLACK-R 10.4. General maintenance (by the user or an aeronautics workshop) A general maintenance by the user or an aeronautics workshop must be made at a lower frequency. The frequency of checking: Every 100 hours or annually Control methods: Visual inspection & Torque wrench...

  • Page 26: General Terms Sale

    11. General terms sale 11.1. Ordering procedure Orders placed by fax, by phone or mail server engage the customer upon receipt by our Customer Service Order and the Regulations. 11.2. Delivery DUC Propellers Company agrees to make every effort to deliver the order within the shortest time, and the receipt of the order together with the Regulation.

  • Page 27: Annexes

    COBRABLACK-R 12. Annexes 12.1. Dimension of the SAE2 propeller-shafts Lycoming O-320-A2A engine prop-shaft, type SAE 2 Lycoming O-360-A3A engine prop-shaft, type SAE 2 27/32...

  • Page 28: Airfoil

    78" To consulting us Propeller 80" 83" Hydraulic COBRABLACK-R 12.4. Operating limitation of the propeller Maximum engine Designation Maximum RPM power 2-blade Inconel COBRABLACK-R propeller, Right 215 hp 2700 rpm 3-blade Inconel COBRABLACK-R propeller, Right 315 hp 2700 rpm 28/32...

  • Page 29: Identification Marking Of The Propeller

    COBRABLACK-R 12.5. Identification marking of the propeller 12.5.1. Manufacturing label As the propeller is dismountable, each component (blade and half-hub) has a manufacturing traceability label which identifies the component and specifies its own serial number: Half-hub COBRA COBRA-PV Right Blade...

  • Page 30: Declaration Of Conformance Of The Hydraulic Cobrablack-R Propellers

    Hydraulic 12.6. Declaration of conformance of the COBRABLACK-R propellers 12.6.1. Design and Construction The propellers were designed to be adapted to the applications described in section 0. Every designs features are reliable and mastered by DUC Hélices company. The materials used in the propeller were selected for their technical properties to be conforms to the definition of the propeller and durable during the propeller life.
  • Page 31 COBRABLACK-R (Intentionally left blank) 31/32...
  • Page 32 Aérodrome du Beaujolais (LFHV) 289 Avenue Odette & Edouard DURAND 69620 FRONTENAS - FRANCE ISO 9001:2015 Phone. : + 33 (0)4 74 72 12 69 Certified Company E-mail : contact@duc-helices.com www.duc-helices.com Neoprene cover – Commercial reference: 01-80-002 Degrease your propeller REDUCE CONSUMPTION by improving performance Commercial reference: 01-80-003...

This manual is also suitable for:

01-57-10601-57-10701-57-10801-57-109

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