Hoffmann HO-V 62 Operation And Maintenance Manual

Mechanical two-position propeller

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Manual No. E 0107.72A
August 2003
OPERATION AND MAINTENANCE MANUAL
HO-V 62
Mechanical Two-Position Propeller
(Take Off and Feathering)
HO-V 62 R - ()
Mechanical Three-Position Propeller
)
(Take Off, Cruise and Feathering
HOFFMANN GmbH & Co. KG
Küpferlingstraße 9
D-83022 Rosenheim
Tel. ++49/8031/1878-0
Fax ++49/8031/1878-78

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  • Page 1 Manual No. E 0107.72A August 2003 OPERATION AND MAINTENANCE MANUAL HO-V 62 Mechanical Two-Position Propeller (Take Off and Feathering) HO-V 62 R - () Mechanical Three-Position Propeller (Take Off, Cruise and Feathering HOFFMANN GmbH & Co. KG Küpferlingstraße 9 D-83022 Rosenheim Tel.
  • Page 2 Hoffmann Propeller Manual No. E 0107.72A Record of Revisions to this Manual Rev Issue Date Inserted Issue Date Inserted Date Inserted by Date Inserted by 61-10-01 New Edition August 2003...
  • Page 3: Table Of Contents

    Hoffmann Propeller Manual No. E 0107.72A Content GENERAL......................1-1 DESIGNATION ....................2-1 2-1. Designation of the Hub .....................2-1 2-2. Designation of the Blade ...................2-2 DESIGN DATA....................3-1 CONSTRUCTION..................... 4-1 4-1. Hub Assembly......................4-1 4-2. Pitch Change Mechanism ..................4-1 4-2.1. HO – V62R......................4-1 4-2.2.
  • Page 4 Hoffmann Propeller Manual No. E 0107.72A 7-7. Special inspections.....................7-7 PROPELLER ADJUSTMENT ................8-1 MAINTENANCE AND REPAIR................ 9-1 SHIPPING AND STORAGE ............... 10-1 10-1. Shipping........................10-1 10-2. Storage........................10-1 61-10-01 New Edition August 2003...
  • Page 5 Hoffmann Propeller Manual No. E 0107.72A List of Illustrations Fig. 4-1 Blade in "Take Off" Position..................4-3 Fig. 4-2 Blade in "Cruise" Position ..................4-4 Fig. 4-3 Blade in "Feathered" Position.................4-4 Fig. 4-4 Blade Tipping Type A + B ..................4-5 Fig. 7-1 Normal Erosion......................7-3...
  • Page 6: 1- General

    Manual No. E 0107.72A General The propeller HO-V 62 () is a two bladed lightweight propeller with mechanical pitch change device. It is equipped with a “Take Off Position” and a “Feathering Position”. It was mainly designed and developed for the use with early generation of powered gliders.
  • Page 7: 2- Designation

    Manual No. E 0107.72A Designation 2-1. Designation of the Hub / Blade Model 1. Hoffmann GmbH & Co. KG 2. Variable pitch propeller 3. Number of basic model 4. Number of blades 5. Flange type: Blank = basic model 6. Number of hub extension from blade axis to flange, if required blank: 104 mm (4.09 inch)
  • Page 8: Designation Of The Blade

    Hoffmann Propeller Manual No. E 0107.72A 2-2. Designation of the Blade ±() 9. Sense of rotation: blank: right hand, tractor right-hand, pusher left-hand, tractor left-hand, pusher blank: Type “A” or “ B “ erosion shield Type “ C “ erosion shield...
  • Page 9 Both designations are separated by a slash mark. Example: HO-V 62 R / L 160 BT The serial-No. of the hub is also the serial-No. of the propeller assembly Translation Geräte- Nr.: TCDS-No.: Part- Nr.:...
  • Page 10: 3- Design Data

    Hoffmann Propeller Manual No. E 0107.72A Design data Following data are only standard values and for information only. For installation purposes only the data given in the applicable Type Certificate Data Sheet (TCDS) No. 32.130 / 13 (latest edition) of the German Luftfahrt-Bundesamt (LBA) are valid.
  • Page 11: 4- Construction

    Hoffmann Propeller Manual No. E 0107.72A Construction The HOFFMANN mechanical variable pitch propeller consists of 4 sub assemblies: - Hub assembly - Blade assembly - Spinner assembly - Counterweight assembly if applicable 4-1. Hub Assembly The hub is made of aluminium alloy, shot peened and anodised. It contains the inner and the outer pitch change mechanism.
  • Page 12 Hoffmann Propeller Manual No. E 0107.72A In order to change the propeller pitch, the aircraft has to be equipped with an aircraft installed pitch change actuating system. This system is installed on the engine of the aircraft and connected to the actuating lever or a handle in the cockpit.
  • Page 13: Fig. 4-1 Blade In "Take Off" Position

    Hoffmann Propeller Manual No. E 0107.72A If the actuating lever or handle in the cockpit will be pulled between 1800- and max. 1900 propeller rpm, the yoke (4-6) is lifted from the hub (4-7). The centrifugal force of the stop plate (4-12) compresses the return spring (4-13) and allows the stop plate (4-12) to move outward till the inside of the hole touches the pitch change rod (4-8).
  • Page 14: Fig. 4-2 Blade In "Cruise" Position

    Hoffmann Propeller Manual No. E 0107.72A Fig. 4-2 Blade in "Cruise" Position Fig. 4-3 Blade in "Feathered" Position 61-10-01 Page4-4 New Edition April 2004...
  • Page 15: 4-2.2. Ho - V62

    4-3. Blade Assembly The HOFFMANN composite blade is a joint construction. The blade root is made of highly compressed hardwood (compreg) and the blade part is made of light wood (spruce). Blades may also be manufactured of compressed wood only.
  • Page 16: Blade Bearing

    Hoffmann Propeller Manual No. E 0107.72A The propeller blade is covered with fibre-reinforced epoxy (FRP). Fatigue failures due to vibration are unlikely with such blades because the internal damping of the material is considerably higher than that of duralumin. Several layers of special polyurethane paint (PU- paint) are sprayed onto the fibre reinforced epoxy covering and the erosion tipping, this assures a high resistance to atmospheric conditions.
  • Page 17: 5- Operation

    Hoffmann Propeller Manual No. E 0107.72A Operation Propeller HO-V62 and HO-V62R CAUTION Follow closely the instruction given in the aircraft manual. The instruction given in this manual is for information only. WARNING Make sure the distance between the ball bearings and the thrust-plate is always at least 1mm with the propeller blades in the take off position.
  • Page 18: Propeller Model Ho - V62R

    Hoffmann Propeller Manual No. E 0107.72A 5-1. Propeller Model HO – V62R CAUTION Before performing any adjustments to the propeller make sure the engine develops its full power and the rpm indicator is correct. Adjustments may be performed only by certified mechanics.
  • Page 19: 6- Installation

    Hoffmann Propeller Manual No. E 0107.72A Installation Propeller HO-V62 and HO-V62R WARNING Before starting any work on the propeller follow the precaution given in the flight manual. CAUTION Propeller installation is subject to an immediate inspection by a licensed engineer CAUTION Follow closely the instructions given in the aircraft manual.
  • Page 20 Hoffmann Propeller Manual No. E 0107.72A CAUTION Do not grease the outer pitch change mechanism. Use grease only to prevent corrosion. 6. Apply a very thin layer of grease to the thrust plate along the track of the ball bearings. Use Calypsol H442 or equivalent.
  • Page 21: 7- Inspection

    Hoffmann Propeller Manual No. E 0107.72A Inspection WARNING Do not use the propeller as a handle to move the aircraft. 7-1. Daily Inspection CAUTION Before performing any work on the propeller follow the precautions given in the flight manual NOTE New propellers tend to show a higher friction at the beginning, but after a few operation hours the blades will turn smooth.
  • Page 22: 100H Inspection

    Hoffmann Propeller Manual No. E 0107.72A 7-2. 100h Inspection To be carried out every 100 hours until TBO is reached. 1. Clean the propeller. Remove spinner dome. Perform daily inspection. Check flange bolts for correct torque by applying the required torque only (do not loosen the bolts before).
  • Page 23: Inspection Of The Blades

    Hoffmann Propeller Manual No. E 0107.72A 7-3. Inspection of the blades 1. Clean the blades. Inspection of wooden composite blades is easy and gives reliable results. Critical condition will show up early as surface cracks in the paint. Therefore correct judgement of such cracks is very important.
  • Page 24: Fig. 7-3 Erosion Tipping Type A

    Hoffmann Propeller Manual No. E 0107.72A 4. A fine crack along the blade tipping (Type A) or along the end of the bronze fabric is not dangerous. A fine crack at the starting point of the bronze fabric or blade tipping is not dangerous as well. Sometimes such cracks occur and are a normal indication of the different dilatation of the different materials (wood, brass, bronze fabric).
  • Page 25: Fig. 7-6 Cracks In The Paint Of Blade

    7. Cracks in the paint or in the blade, starting from the blade tip and extending parallel to the blade axis, are indications for torsional vibration. Such cracks occur very seldom, but if they do, contact the manufacturer or a HOFFMANN approved repair shop.
  • Page 26: Damaged Fibre Glass Cover

    The TBO (time between overhaul) is normally the same as for the engine, but should not exceed the figures of HOFFMANN Service Bulletin No. E 1(), latest edition. Overhaul must be carried out by HOFFMANN or by a propeller repair station authorised by HOFFMANN.
  • Page 27: Special Inspections

    Hoffmann Propeller Manual No. E 0107.72A 7-7. Special inspections 1. Special inspection is required if the max. rated propeller speed according the "TCDS" (LBA - Kennblatt) has been exceeded by more than 10%. If the over - speed was more than 20% of the max rated propeller - speed, the propeller has to be removed from service.
  • Page 28: 8- Propeller Adjustment

    Propeller installation and adjustment may only be performed by a qualified mechanic and is subject to immediate inspection by a licensed engineer. If, nevertheless, a re-adjustment of the propeller take off pitch in the field should be necessary contact the aircraft manufacturer or Hoffmann. 61-10-01 Page8-1...
  • Page 29: 9- Maintenance And Repair

    Manual No. E 0107.72A Maintenance and Repair 1. The paint of the HOFFMANN composite blades is resistant against fuel, oil and nearly all solvents. The propeller should be cleaned periodically using gentle detergent or equivalent and be protected with car polish, which does not contain silicone.
  • Page 30: Fig. 9-1 Rework Leading Edge Type B

    Hoffmann Propeller Manual No. E 0107.72A 8. If the leading edge Type B shows sharp nicks or becomes jagged then it should be blended using a fine file or sand paper. Should the leading edge become eroded close to the wooden core or it starts cracking and small pieces come off the propeller should be returned for repair.
  • Page 31: 10- Shipping And Storage

    No propeller should be stored standing on the blade tips. The best is to store the propeller in the original packing. Special preservation of HOFFMANN composite blades is not necessary; the existing surface protection is sufficient. Also the hub does not need preservation if the propeller is stored in a dry room.
  • Page 32: Fig. 10-1 Propeller Ho - V62

    Hoffmann Propeller Manual No. E 0107.72A Fig. 10-1 Propeller HO - V62 61-10-01 Page10-2 New Edition April 2004...
  • Page 33: Fig. 10-2 Propeller Ho - V62R

    Hoffmann Propeller Manual No. E 0107.72A Fig. 10-2 Propeller HO - V62R 61-10-01 Page10-3 New Edition April 2004...
  • Page 34 Hoffmann Propeller HO-V62 Modification „P“ PRELIMINARY INSTRUCTION TO CMM E157 A MODIFICATION “P” ON HO-V62 HUBS (REINFORCED PITCH CHANGE STUDS/RODS) NOTE There are a few old hubs with tolerance in its outer shape which cannot be changed into Mod.”P”. Check if Modification “P” is practicable on the present hub.
  • Page 35 Hoffmann Propeller HO-V62 Modification „P“ Hub modification with drilling device PV-2676 and drilling fixture PV-2675. NOTE The following description refers only to one side of the hub. Treat the other side in the same way. Fig.2 Fix the device PV-2676 with the Dowel Pin on the present rear- and with the Fixing Screw on the forward guide rod fixing hole (UNF No.
  • Page 36 Hoffmann Propeller HO-V62 Modification „P“ Fig.4 Put the hub into the drilling fixture PV-2675 (Fig.4). Loose the Fixing Screw, slide the Drilling Device PV-2676 against the 45° chamfer of the hub and tighten the Fixing Screw again. Now drill the new hole for the forward fastening thread of the rod guide with ø6,3mm(0.25 inch) and 15mm(0.6 inch) deep.
  • Page 37 Serial-No. and to be written on the identification decals on the blades. General information about HO-V62 Modification”P” with the new parts Reassamble procedures are similar as before the Modification “P” and described in the HOFFMANN COMPONENT MAINTENANCE MANUAL E157 / Chapter 7. Fig.6 NOTE Before installing the Thrust plate assy (1.2/1.3 or 1.69/1.70) to the hub unit,...
  • Page 38 Hoffmann Propeller HO-V62 Modification „P“ Part List New parts required for Modification “P”. Pos. Part Number Name VP20-482B+ Hub (preassembled) 1.1.1 VP20-482B 1.1.5 01320060009 Heli-Coil (M6x1,5d) VP20-1737 Stud VP20-1720 VD-252AD Spring 1.12 VP20-1721 Yoke 1.13 VP20-1735 Rod Guide 1.14 DIN934-M8-8 1.15...

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Ho-v 62 r

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