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Sportine Aviacija LAK­17B FES Flight Manual

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  • Page 2 LAK 17B FES Flight Manual...
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  • Page 10 LAK 17B FES Flight Manual Means that the non observation of the corresponding procedure leads to an immediate or important degradation of the flight safety. Means that the non observation of the corresponding procedure leads to a minor or to a more or less long term degradation ofthe flight safety.
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  • Page 16 LAK-17B FES Flight Manual LAK-17B FES is a self-sustaining powered sailplane and is prohibited from taking off solely by the means of it’s own power.
  • Page 17 LAK-17B FES Flight Manual At higher altitudes the true airspeed is higher than the indicated airspeed , and V is reduced with altitude. select your motor start/stop speed correctly: - flaps must be at +2 position; - make sure your selected speed for motor start / stop is at least 8…...
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  • Page 20 LAK-17B FES Flight Manual When landing on a rough and hard surface always dump all water ballast before landing. Heavy pieces of baggage must be secured to the baggage compartment floor. The sailplane may be safely operated only when loaded in the range defined in the Chapter 6 ofthis manual.
  • Page 21 LAK-17B FES Flight Manual With low pilot weight lead ballast must be added to the front part ofthe cockpit. LAK-17B FES is a sailplane with Front Electric Sustainer system and is prohibited from taking off solely by the means ofit’s own power. Flying with removed motor is not allowed.
  • Page 22 LAK-17B FES Flight Manual For winch or auto-tow launch, only the C. G. hook can be used. Aerotow launches are only allowed at the aerotow hook.
  • Page 23 LAK-17B FES Flight Manual Flight with water ballast must be conducted at an OAT greater than +2 °C (36 °F). Otherwise jettison both wing and fin water ballast in order to prevent structural damages due to freezing ofwater. Maximum take-offweight must not be exceeded.
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  • Page 26 LAK-17B FES Flight Manual The red handle of the spring-type mechanism on the canopy hinge must be in the unlocked working) position. If you have to bail out with the motor running, stop motor, if there is time enough to do so, as follows: by rotation the Rotary encoder button counter clockwise stop the propeller.
  • Page 27 LAK-17B FES Flight Manual Altitude loss due an incipient spin from straight flight with prompt recovery is 30 m 98 ft. ), increasing to 60 m 196 ft. ) from circling flight and 60 m 196 ft. ) to 120 m 394 ft. ) with airbrakes extended.
  • Page 28 LAK-17B FES Flight Manual On earlier software versions below v2. 13), it was necessary to manually reduce throttle bar to zero, otherwise motor did not start due to safety. When throttle was reduced to zero then motor started normally. On new versions from FCU v2. 13) throttle bar goes to zero automatically.
  • Page 29 LAK-17B FES Flight Manual with a lot of water Sailplane is equipped with one of two types of battery compartment fire warning systems: – temperature indicator with a buzzer (when T ≥ 90 °C) on top of the instrument panel (option 1); –...
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  • Page 34 LAK-17B FES Flight Manual Make sure that connecting cable is not installed, between Battery packs (ifthey are fixed inside the fuselage) It’s not allowed to rig or de-rig wings with outer wings installed. Lock the main wing pin handles with fixing studs.
  • Page 35 LAK-17B FES Flight Manual For de-rigging, before unscrewing mounting bolt, unfix it by pulling out locking pin. Remove horizontal stabilizer before removing the wings. Allow tanks to vent while filling. Do not fill with pressure exceeding 1 psi / 0, 06 bar as the structure could be damaged. Check for proper dump valves operation prior to flight.
  • Page 36 LAK-17B FES Flight Manual It is recommended to charge Battery packs fully just a day or two before next flight is planned. However plan charging so that there will be enough time for properly completed charging process. Make sure that both battery packs are fully charged before installation into sailplane.
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  • Page 38 LAK-17B FES Flight Manual After a hard landing or if high loads have been experienced, a complete inspection according to the Maintenance Manual Section 5. 5 must be performed. Contact the manufacturer for assistance ifrequired.
  • Page 39 LAK-17B FES Flight Manual In case that you would like to test system at maximum power, somebody needs to hold a fuselage tube down, and hold a glider...
  • Page 40 LAK-17B FES Flight Manual Aero-tow launches are only allowed at the aero-tow hook. When water tanks are partially filled, keep wings horizontal before take-offto avoid uneven water distribution. It is not allowed to start and run FES motor during aero tow! Do not decrease the speed up to V = 100 km/h (54 kts) because the auto-release mechanism on the hook will function.
  • Page 41 LAK-17B FES Flight Manual It is prohibited to use the aero-tow hook for winch or auto- tow launches. When water tanks are partially filled, keep wings horizontal before take-offto avoid uneven water distribution. It is not allowed to start and run FES motor during winch or auto tow! Seat back must be properly fixed! During flight always keep the FCU turned ON.
  • Page 42 LAK-17B FES Flight Manual Altitude loss due to an incipient spin from straight flight with prompt recovery is approximately 30 m (100 ft. ), increasing for circling flight. Do not use motor in flight below 150 m (490 ft) above ground level.
  • Page 43 LAK-17B FES Flight Manual You can reduce power in thermals, and use more power in sinking air. For successful stop the motor should reach minimum 700 RPM, otherwise braking will not be working, due to (regeneration function of controller is used for propeller braking).
  • Page 44 LAK-17B FES Flight Manual Positioning does not work if Canopy message is active, or if throttle is set to zero power instead ofbraking.
  • Page 45 LAK-17B FES Flight Manual Always remove connecting cable between the packs after landing. (GEN1Battery packs: Always remove Power fuse after landing and put safety covers on free terminals. ) It is prohibited to use the aero-tow hook for winch or auto- tow launches.
  • Page 46 LAK-17B FES Flight Manual Flight with water ballast must be conducted at an OAT greater than +2 °C (36 °F). If there is a risk of freezing temperatures, all water ballast, including fin water ballast must be dumped before freezing temperatures are reached. The flight conditions must comply with the following table: A filling ballast tank with pressurized water is prohibited.
  • Page 47 LAK-17B FES Flight Manual Avoid flying close to lightning activity.
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  • Page 49: Table Of Contents

    LAK-17B FES F l i g h t M a n u a l Chapter 5 PERFORMANCE Introduction....................5-2 Data approved by EASA................5-2 5.2.1 Airspeed indicator system calibration ..........5-2 5.2.2 Stall speeds ..................5-3 Additional information.................5-3 5.3.1 Demonstrated crosswind components ..........5-3 5.3.2 Glide performance ................5-3 5.3.3 Flight polar...................5-4...

  • Page 50: Introduction

    LAK-17B FES F l i g h t M a n u a l Introduction This Chapter provides EASA approved data for airspeed calibration, stall speeds and take-off performance and non-approved further information. The data in the charts have been computed from actual flight tests with the sailplane in good condition and using average piloting techniques.

  • Page 51: Stall Speeds

    LAK-17B FES F l i g h t M a n u a l 5.2.2 Stall speeds Stall speed in level flight, km/h (kts) Flap position without water with maximum take off ballast weight 80 (43.2) 83 (44.8) 82 (44.2) 85 (45.9) 83 (44.8) 87 (47)

  • Page 52: Flight Polar

    LAK-17B FES F l i g h t M a n u a l 5.3.3 Flight polar 5.3.4 Powered flight performance 5.3.4.1 Rate of climb Maximum rate of climb is available only for a few minutes with fully charged Battery packs. As voltage is reduced, than also maximum a rate of climb is reduced. Measured average rate of climb at MSL, standard atmosphere, flaps position “+2”, flying at a speed 85…90 km/h (46…48 kts) is: 1.6 m/s (315 ft./min) for maximum weight without water ballast;...
  • Page 53 LAK-17B FES F l i g h t M a n u a l Chapter 6 WEIGHT AND BALANCE / EQUIPMENT LIST Introduction....................6-2 Weighing procedures ...................6-2 Weighing record ..................6-2 Empty weight and C.G.................6-3 Calculation of C.G. position ................6-5 Weight of all non-lifting parts..............6-7 Maximum weight ..................6-7 Useful loads ....................6-7 Water ballast loading table ................6-8...

  • Page 54: Introduction

    LAK-17B FES F l i g h t M a n u a l Introduction This Chapter contains the payload range within which the sailplane can be safely operated. Procedures for weighing the sailplane and the calculation method for establishing the permitted payload range are also provided. A comprehensive list of all equipment available for this sailplane is contained in the Maintenance Manual.

  • Page 55: Empty Weight And C.g

    LAK-17B FES F l i g h t M a n u a l Empty weight and C.G. Approved in flight C.G. positions are: Approved limit, Parameter In flight: Foremost position of C.G. Rearmost position of C.G. Weight and balance record Empty weight of C.G.
  • Page 56 LAK-17B FES F l i g h t M a n u a l Empty sailplane C.G. location Approved Date weight [kg] [mm] Date Signature Rev. No.0 Date: September 23, 2014 Page 6-4...

  • Page 57: Calculation Of C.g. Position

    LAK-17B FES F l i g h t M a n u a l Empty weight center of gravity of the LAK-17B FES is defined for the 18m wing configuration, water ballast tanks empty, glider ready to fly, excluding weight of pilot and parachute.
  • Page 58 LAK-17B FES F l i g h t M a n u a l Where: G = the glider component mass, kg; = distance between glider component mass C.G. and wing root leading edge, mm; distance “-“, if mass C.G. is ahead of the wing root leading edge; distance “+”...

  • Page 59: Weight Of All Non-Lifting Parts

    LAK-17B FES F l i g h t M a n u a l Weight of all non-lifting parts Weight of non-lifting parts of the sailplane includes weight of pilot, fuselage, stabilizer with elevator, rudder, instruments and equipment. Maximum weight of non-lifting parts of the LAK-17B FES is 276,3 kg (609,14 lbs). Maximum weight The maximum approved take-off and landing weight is 600 kg (1322,8 lbs) for 18m wing.

  • Page 60: Water Ballast Loading Table

    LAK-17B FES F l i g h t M a n u a l Water ballast loading table The max permissible water ballast weight (kg) is given in the following table. Wing span: 18 m Saiplane maximum take-off mass- Mass of pilot Sailplane empty weight, kg +fin ballast weight, kg with parachute, Maximum capacity of inner wing tanks…..158 liter (41,7 US gal).
  • Page 61 LAK-17B FES F l i g h t M a n u a l The example how to determine possible loading of the glider: Sailplane empty weight………..…….. 335 kg; Empty weight center of gravity……… 492 mm; Pilot with parachute weight……….… 80 kg;...
  • Page 62 LAK-17B FES F l i g h t M a n u a l Intentionally left blank Rev. No.0 Date: September 23, 2014 Page 6-10...
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  • Page 64 LAK-17B FES F l i g h t M a n u a l Introduction This Chapter provides a description of the sailplane, its systems and provided standard equipment with instructions for use. Airframe construction The LAK-17B FES is a single seat high performance sailplane with Front Electric Sustainer system designed to meet FAI 15m and 18m Class requirements.
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  • Page 66 LAK-17B FES F l i g h t M a n u a l Flight controls and trim The ailerons and elevator are operated from the central control column (control stick). The trim adjustment control knob is located in the left armrest and controls the elevator trim select position.
  • Page 67 LAK-17B FES F l i g h t M a n u a l Flaps The flaps are operated by the gray control handle located on the left cockpit wall. For more information see Maintenance Manual Section 2. Landing gear The landing gear is extended and retracted with the gray control handle located in the right hand armrest.
  • Page 68 LAK-17B FES F l i g h t M a n u a l The canopy latching handles are black and are located on either side of the canopy frame. Pull the handles back to lock and push forward to un-lock. Never use the window opening to lift or lower the canopy.
  • Page 69 LAK-17B FES F l i g h t M a n u a l 7.11 Seat back adjustment Seat back adjustment is accomplished by using the squeeze ring located on the left cockpit side. 7.12 Baggage compartment Hard objects cannot be carried in the baggage compartment without a suitably designed lashing or anchorage.
  • Page 70 LAK-17B FES F l i g h t M a n u a l 7.15 Miscellaneous equipment 7.15.1 Oxygen system The oxygen system (Aerox Oxygen, type C, D or M) must be operated in accordance with the instructions provided by the manufacturer (Aerox Oxygen, type C, D or M) of the system.
  • Page 71 LAK-17B FES F l i g h t M a n u a l 7.19 Electrical system Detailed description of FES electrical system can be found in FES maintenance manual. 7.20 Motor controls The LAK-17B FES motor is controlled by help of FCU (FES control unit) instrument.
  • Page 72 LAK-17B FES F l i g h t M a n u a l Description Description of function Switch ON/OFF for FCU instrument Throttle, brake, reset Power button from minimum to maximum RPM Push button to reset and second screen LED 1 –...
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  • Page 74 LAK 17B FES Flight Manual fire warning system LED fire warning system test button...
  • Page 75 LAK-17B FES F l i g h t M a n u a l Chapter 8 SAILPLANE HANDLING, CARE AND MAINTENANCE Introduction....................8-2 Inspection periods and maintenance ............8-2 Alterations and repairs .................8-2 Tie down ......................8-2 Sailplane trailer ....................8-3 Ground handling ..................8-3 Cleaning.......................8-4 Rev.
  • Page 76 LAK-17B FES F l i g h t M a n u a l Introduction This chapter contains the manufacturer’s recommended procedures for proper handling and servicing of the sailplane. It also identifies certain inspection and maintenance activities, which are needed to retain performance and dependability. Inspection periods and maintenance The Instructions for Continued Airworthiness as provided in the LAK-17B FES Maintenance Manual must be followed.
  • Page 77 LAK-17B FES F l i g h t M a n u a l The external surfaces of the LAK-17B FES are finished in a durable epoxy Note: paint, however long exposure to sun and humidity will lead to premature aging of any surface finish.
  • Page 78 LAK-17B FES F l i g h t M a n u a l Make sure that propeller is in horizontal position when lifting Caution: rear part of fuselage to attach tail dolly. Newer use a propeller or spinner for pushing, pulling or tail Warning: lifting! Cleaning...
  • Page 79 LAK-17B FES F l i g h t M a n u a l Intentionally left blank Rev. No.0 Date: September 23, 2014 Page 8-5...
  • Page 80 LAK-17B FES F l i g h t M a n u a l Chapter 9 SUPPLEMENTS There are no supplements Rev. No.0 Date: September 23, 2014 Page 9-1...

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