* LAK-17B technical and performance data
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LAK-17B

The LAK-17B is a new generation of FAI 15m/18m class sailplane, designed according to JAR-22 category "U" specifications. It is a mid-wing gilder with flaps, T-tail, retractable main landing gear and is capable of carrying 200 liters (52 gallons) water ballast.

LAK-17B is a new version of LAK17A. LAK-17B has new wings with modified geometry and new wing profile allowing even higher wing loadings than competitors. Fuselage and tail section are identical with the A version.

Click on the images for full size.

   
TECHNICAL DATA LAK-17B AND LAK-17B FES
Sailplane LAK-17B LAK-17B FES
Wing span, m 15 18 15 18
Wing area, m2 9,18 10,32 9,18 10,32
Wing aspect ratio 24,51 31,39 24,51 31,39
Fuselage length, m 6,53 6,53 6,53 6,53
Fuselage height, m 1,322 1,322 1,322 1,322
Empty mass approx. kg 250 260 285 295
Max TOW, kg 550 600 550 600
Water ballast (wings), kg 160 200 130 170
Water ballast (fuse-option), kg 30 30 batteries batteries
Batteries weight, kg     24 24
VNE, km/h 270 270 270 270
Min. wing loading 34,85 31,97 39 35,8
Max. wing loading 59,91 58,13 59,91 58,13

LAK17B FES

LAK17B-FES

The creators of Front Electric Sustainer ( FES ) are Luka Znidarsic and Matija Znidarsic, both experienced sailplane pilots and mechanical engineers in Slovenia.

Front refers to the motor’s location, right in the nose of the sailplane. A 0.9 meter carbon fibre propeller automatically extends when the outrunner is operating. When not in use, the propeller blades fold against the nose of the sailplane thus reducing drag. Each blade weighs just 230 g and is 1.0 m in diameter.

LAK17B FES with Front Electric Sustainer (FES)

The Znidarsic's developed their own brushless DC synchronous permanent magnet electric motor and controller for the application which is light, small and mounted on top of main whell box. The motor is 5 kg (11 pounds), and puts out 15 kW (20.1 horsepower) at 85 Volts. Total weight for the power package is 35 kg (77 pounds), with Kokam lithium-ion batteries in two packs ( each behind the rear spar, balancing the weight of the motor and propeller in the nose ).

If batteries are discharged during flight using the motor, they are easily accessible from the top of the fuselage so that you can take them out for charging. Unlike lead acid batteries, Li-Po batteries can be stored for 3 or 5 months without significantly losing charge. Charging time of batteries is about 4 hours using the cell balancers.

For more information about FES please visit www.front-electric-sustainer.com .

The cockpit is of monocoque construction. The manually contoured seat pan and an adjustable seat back together with optimally arranged control elements offer notable comfort on long flights. The one-piece Plexiglass canopy hinges forward. On the left side there is a sliding window with additional ventilation. The instrument panel lifts up together with the canopy. The retractable landing gear has a 350xl35 tire and shock absorber. The mechanical main wheel brake is actuated by a handle on the control stick. The rudder pedals are adjustable in flight. All controls, including the water ballast system, hook up automatically. The tow release is mounted near the main landing gear and permits winch as well as aerotow take off. The wings incorporate fork-type spar roots joined with two pins. The T-tail (fixed stabilizer with elevator) of the LAK-17B provides stable and responsive pitch characteristics. The elevator hooks up automatically during assembly. The glider is fitted with a fin ballast tank (capacity 7 liters) in order to compensate the nose-heavy moment created by the high ballast loads in the wing tanks. The water ballast is filled in, and emptied out through the holes at the bottom of the wings. The VHF antenna is mounted in the vertical fin.

Technical and performance data LAK-17B

(click on the picture or table for full-size image)

 

 

 

 


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Last modified: November 5, 2014