Our site uses cookies to ensure you quality of service. By continuing browsing you agree with Learn more

LAK-17B

Summary

LAK-17B is new version of LAK17A. Regarding A version, B has new wings with modified geometry and new wing profile, which allow even higher wing loadings than competitors. Fuselage and tail section is identical like A version.

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 1 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 240 g.

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 7.3 kg (16.1 pounds), and puts out 22 kW (30 horsepower) at 116 Volts. Total weight for the power package is 45-50 kg (99-110 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 6 hours (2 hours with quick charger) .

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

Empty Weight, kg
305
MTOW, kg
550
Water Ballast in Wings, kg
180
Min Wing Loading, kg/m²
40.8
Max Wing Loading, kg/m²
60
Wing Span, m
15
Wing Area, m²
9.18
Fuselage Length, m
6.53
Fuselage Height, m
1.32
V_ne, km/h
275
G Limits Without Ballast
-2.65/+5.3
Type
SOLO 235
Overall system weight, kg
50
Propeller Diameter, m
0.9
  • Landing gear position warning when opening the airbrakes;
  • Shock absorbing foam cushion;
  • Air inflatable back support pillow, in-flight adjustable to the desirable spine position-strongly recommended to improve your sports results;
  • Antenna for a transponder preinstalled in the fin;
  • Factory installed ELT;
  • Holes in the fin water ballast tank protects from overfilling the tank and CofG moving behind the limits;
  • LED strobe, low energy consumption;
  • Factory installed oxygen system;
  • Tinted canopy glass;
  • Air extractor;
  • Microphone in the instrument panel;
  • Choice of cushion materials, fitting the LAK standard shape or a customized shape:
  • Sockets for a headset;
  • Installation of a CD or USB player;
  • Bluetooth devices.
Empty Weight, kg
320
MTOW, kg
600
Water Ballast in Wings, kg
200
Min Wing Loading, kg/m²
37.8
Max Wing Loading, kg/m²
58
Wing Span, m
18
Wing Area, m²
10.32
Fuselage Length, m
6.53
Fuselage Height, m
1.32
V_ne, km/h
275
Min. Sink Rate, m/s
0.53
Best L/D Without Ballast
50.2
G Limits Without Ballast
-2.65/+5.3
Type
SOLO 235
Overall system weight, kg
50
Propeller Diameter, m
0.9
  • Landing gear position warning when opening the airbrakes;
  • Shock absorbing foam cushion;
  • Air inflatable back support pillow, in-flight adjustable to the desirable spine position-strongly recommended to improve your sports results;
  • Antenna for a transponder preinstalled in the fin;
  • Factory installed ELT;
  • Holes in the fin water ballast tank protects from overfilling the tank and CofG moving behind the limits;
  • LED strobe, low energy consumption;
  • Factory installed oxygen system;
  • Tinted canopy glass;
  • Air extractor;
  • Microphone in the instrument panel;
  • Choice of cushion materials, fitting the LAK standard shape or a customized shape:
  • Sockets for a headset;
  • Installation of a CD or USB player;
  • Bluetooth devices.
Empty Weight, kg
332
MTOW, kg
600
Water Ballast in Wings, kg
200
Min Wing Loading, kg/m²
34.7
Max Wing Loading, kg/m²
51.8
Wing Span, m
21
Wing Area, m²
11.58
Fuselage Length, m
6.53
Fuselage Height, m
1.32
V_ne, km/h
220
G Limits Without Ballast
-2.65/+5.3
Type
SOLO 235
Overall system weight, kg
50
Propeller Diameter, m
0.9
  • Landing gear position warning when opening the airbrakes;
  • Shock absorbing foam cushion;
  • Air inflatable back support pillow, in-flight adjustable to the desirable spine position-strongly recommended to improve your sports results;
  • Antenna for a transponder preinstalled in the fin;
  • Factory installed ELT;
  • Holes in the fin water ballast tank protects from overfilling the tank and CofG moving behind the limits;
  • LED strobe, low energy consumption;
  • Factory installed oxygen system;
  • Tinted canopy glass;
  • Air extractor;
  • Microphone in the instrument panel;
  • Choice of cushion materials, fitting the LAK standard shape or a customized shape:
  • Sockets for a headset;
  • Installation of a CD or USB player;
  • Bluetooth devices.
Empty Weight, kg
305
MTOW, kg
550
Water Ballast in Wings, kg
180
Min Wing Loading, kg/m²
40.8
Max Wing Loading, kg/m²
60
Wing Span, m
15
Wing Area, m²
9.18
Fuselage Length, m
6.53
Fuselage Height, m
1.32
V_ne, km/h
275
G Limits Without Ballast
-2.65/+5.3
Type
FES-LAK-M100
Overall system weight, kg
52
Batteries weight
32kg
Total Energy Capacity of the Batteries, kWh
4.2
Single Battery Charging Time, h
4
Continuous Power, kW
20
Max Power, kW
22
Propeller Diameter, m
1.0
  • Landing gear position warning when opening the airbrakes;
  • Shock absorbing foam cushion;
  • Air inflatable back support pillow, in-flight adjustable to the desirable spine position-strongly recommended to improve your sports results;
  • Antenna for a transponder preinstalled in the fin;
  • Factory installed ELT;
  • Holes in the fin water ballast tank protects from overfilling the tank and CofG moving behind the limits;
  • LED strobe, low energy consumption;
  • Factory installed oxygen system;
  • Tinted canopy glass;
  • Air extractor;
  • Microphone in the instrument panel;
  • Choice of cushion materials, fitting the LAK standard shape or a customized shape:
  • Sockets for a headset;
  • Installation of a CD or USB player;
  • Bluetooth devices.
Empty Weight, kg
320
MTOW, kg
600
Water Ballast in Wings, kg
200
Min Wing Loading, kg/m²
37.8
Max Wing Loading, kg/m²
58
Wing Span, m
18
Wing Area, m²
10.32
Fuselage Length, m
6.53
Fuselage Height, m
1.32
V_ne, km/h
275
Min. Sink Rate, m/s
0.53
Best L/D Without Ballast
50.2
G Limits Without Ballast
-2.65/+5.3
Type
FES-LAK-M100
Overall system weight, kg
52
Batteries weight
32kg
Total Energy Capacity of the Batteries, kWh
4.2
Single Battery Charging Time, h
4
Continuous Power, kW
20
Max Power, kW
22
Propeller Diameter, m
1.0
  • Landing gear position warning when opening the airbrakes;
  • Shock absorbing foam cushion;
  • Air inflatable back support pillow, in-flight adjustable to the desirable spine position-strongly recommended to improve your sports results;
  • Antenna for a transponder preinstalled in the fin;
  • Factory installed ELT;
  • Holes in the fin water ballast tank protects from overfilling the tank and CofG moving behind the limits;
  • LED strobe, low energy consumption;
  • Factory installed oxygen system;
  • Tinted canopy glass;
  • Air extractor;
  • Microphone in the instrument panel;
  • Choice of cushion materials, fitting the LAK standard shape or a customized shape:
  • Sockets for a headset;
  • Installation of a CD or USB player;
  • Bluetooth devices.
Empty Weight, kg
332
MTOW, kg
600
Water Ballast in Wings, kg
200
Min Wing Loading, kg/m²
34.7
Max Wing Loading, kg/m²
51.8
Wing Span, m
21
Wing Area, m²
11.58
Fuselage Length, m
6.53
Fuselage Height, m
1.32
V_ne, km/h
220
G Limits Without Ballast
-2.65/+5.3
Type
FES-LAK-M100
Overall system weight, kg
52
Batteries weight
32kg
Total Energy Capacity of the Batteries, kWh
4.2
Single Battery Charging Time, h
4
Continuous Power, kW
20
Max Power, kW
22
Propeller Diameter, m
1.0
  • Landing gear position warning when opening the airbrakes;
  • Shock absorbing foam cushion;
  • Air inflatable back support pillow, in-flight adjustable to the desirable spine position-strongly recommended to improve your sports results;
  • Antenna for a transponder preinstalled in the fin;
  • Factory installed ELT;
  • Holes in the fin water ballast tank protects from overfilling the tank and CofG moving behind the limits;
  • LED strobe, low energy consumption;
  • Factory installed oxygen system;
  • Tinted canopy glass;
  • Air extractor;
  • Microphone in the instrument panel;
  • Choice of cushion materials, fitting the LAK standard shape or a customized shape:
  • Sockets for a headset;
  • Installation of a CD or USB player;
  • Bluetooth devices.
Empty Weight, kg
260
MTOW, kg
550
Water Ballast in Wings, kg
180
Min Wing Loading, kg/m²
35.9
Max Wing Loading, kg/m²
60
Wing Span, m
15
Wing Area, m²
9.18
Fuselage Length, m
6.53
Fuselage Height, m
1.32
V_ne, km/h
275
G Limits Without Ballast
-2.65/+5.3
  • Landing gear position warning when opening the airbrakes;
  • Shock absorbing foam cushion;
  • Air inflatable back support pillow, in-flight adjustable to the desirable spine position-strongly recommended to improve your sports results;
  • Antenna for a transponder preinstalled in the fin;
  • Factory installed ELT;
  • Holes in the fin water ballast tank protects from overfilling the tank and CofG moving behind the limits;
  • LED strobe, low energy consumption;
  • Factory installed oxygen system;
  • Tinted canopy glass;
  • Air extractor;
  • Microphone in the instrument panel;
  • Choice of cushion materials, fitting the LAK standard shape or a customized shape:
  • Sockets for a headset;
  • Installation of a CD or USB player;
  • Bluetooth devices.
Empty Weight, kg
280
MTOW, kg
600
Water Ballast in Wings, kg
200
Min Wing Loading, kg/m²
33.9
Max Wing Loading, kg/m²
58
Wing Span, m
18
Wing Area, m²
10.32
Fuselage Length, m
6.53
Fuselage Height, m
1.32
V_ne, km/h
275
Min. Sink Rate, m/s
0.53
Best L/D Without Ballast
50.2
G Limits Without Ballast
-2.65/+5.3
  • Landing gear position warning when opening the airbrakes;
  • Shock absorbing foam cushion;
  • Air inflatable back support pillow, in-flight adjustable to the desirable spine position-strongly recommended to improve your sports results;
  • Antenna for a transponder preinstalled in the fin;
  • Factory installed ELT;
  • Holes in the fin water ballast tank protects from overfilling the tank and CofG moving behind the limits;
  • LED strobe, low energy consumption;
  • Factory installed oxygen system;
  • Tinted canopy glass;
  • Air extractor;
  • Microphone in the instrument panel;
  • Choice of cushion materials, fitting the LAK standard shape or a customized shape:
  • Sockets for a headset;
  • Installation of a CD or USB player;
  • Bluetooth devices.
Empty Weight, kg
292
MTOW, kg
600
Water Ballast in Wings, kg
220
Min Wing Loading, kg/m²
31.2
Max Wing Loading, kg/m²
51.8
Wing Span, m
21
Wing Area, m²
11.58
Fuselage Length, m
6.53
Fuselage Height, m
1.32
V_ne, km/h
220
G Limits Without Ballast
-2.65/+5.3
  • Landing gear position warning when opening the airbrakes;
  • Shock absorbing foam cushion;
  • Air inflatable back support pillow, in-flight adjustable to the desirable spine position-strongly recommended to improve your sports results;
  • Antenna for a transponder preinstalled in the fin;
  • Factory installed ELT;
  • Holes in the fin water ballast tank protects from overfilling the tank and CofG moving behind the limits;
  • LED strobe, low energy consumption;
  • Factory installed oxygen system;
  • Tinted canopy glass;
  • Air extractor;
  • Microphone in the instrument panel;
  • Choice of cushion materials, fitting the LAK standard shape or a customized shape:
  • Sockets for a headset;
  • Installation of a CD or USB player;
  • Bluetooth devices.