* LAK-17AT description
* LAK-17AT performance data
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The LAK-17AT is a single-seat, high performance self-sustaining powered sailplane of FAI 15m – 18m class designed according to JAR-22 category “U” specifications. It is a mid-wing motor-glider with flaps, T-tail, retractable main landing gear. The sailplane is equipped with retractable power-plant powered by the 19,6 kW (26.28 hp) two-stroke two-cylinder air-cooled SOLO 2350 engine.

The sailplane is made of composite materials. The wing spar is made of pulltruded carbon rods GRAPHLITE SM315 and has a double T section. The wing water ballast of 180 liters (47.55 US gal.) is filled in and poured out through holes at the bottom of the wings. The airbrakes are located on the upper wing surface only. The wing airfoil is LAP 92-130/15 at the root transiting into LAP 92-150/15 at the tip.

The cockpit is of monocoque construction. The controllable seat back and an adjustable head rest together with optimally arranged controls offer notable comfort for long flights. The one piece Plexiglass canopy hinges forward. The instrument panel lifts up together with the canopy. The material which is used for the canopies of  LAK 17AT  has a UV permeability of 99%. That means, that only 1% of UV passes the glass.

The retractable landing gear with shock absorbers has a 350x135mm tire. The mechanical main wheel brake is actuated by a handle on the stick. The rudder pedals are adjustable in flight. All controls, including the water ballast system, hook up automatically or semi-automatically. Towing hooks are mounted near the main landing gear (C.G. / winch / auto-tow hook) and/or in front of the pilot cockpit at the bulkhead (aero tow hook).

The T-tail (fixed stabilizer with elevator) of the LAK-17AT provides stable and responsive pitch characteristics. The elevator hooks up automatically during assembly. The glider is fitted with a fin ballast tank of 8 ltr. (2.11 US gal.) capacity in order to adjust the optimum C.G. position. The antenna is mounted in the vertical fin..

The powerplant is operated and controlled by motor control unit ILEC MCU. Extraction /retraction is operated automatically with the extract/retract switch located on the MCU unit. Electronic safety devices are provided to avoid misoperation.

 

 

Technical data LAK-17AT

DIMENSIONS WEIGHTS AND LOADINGS
Wing span 15 meter
49.2 ft		 18 meter
59.1 ft		   15 meter 18 meter
Wing area 9.06 m2
97.52 sqft		 9.80 m2
105.51 sqft		 Empty weight approx. 273 kg
602 lbs		 283 kg
624 lbs
Wing aspect ratio 24.83 33 Max. gross weight 500 kg
1102 lbs		 500 kg
1102 lbs
Fuselage length 6.53 m / 21.4 ft 6.53 m / 21.4 ft Max. wing loading 55 kg/m2
11.3 lbs/sqf		 51 kg/m2
10.4 lbs/sqf
Height 1.29 m / 4.2 ft 1.29 m / 4.2 ft Min. wing loading 36.4 kg/m2
7.45 lbs/sqf		 34.2 kg/m2
7.0 lbs/sqf

Performance

SPEEDS AND LIMITATIONS *)
*) Limitations reflect certification in the standard airworthiness 'U' category per JAR-22, as listed in the flight manual. Proven design loads exceed the limits set by certification.  		PERFORMANCE
Wing span 15 meter 18 meter   15 meter 18 meter
Max. calm air speed

Limit load factor *)
with airbrakes retracted
with airbrakes extended

 275 km/h
148 knots

+ 4 / -1.5
+ 3.5 / 0

 275 km/h
148 knots

+ 4 / -1.5
+ 3.5 / 0

 Min. sink rate 0.54 m/s
105 fpm		 0.49 m/s
96 fpm
Max. rough air speed

Limit load factor *)

 205 km/h
110 knots

+ 5.3 / -2.65

 205 km/h
110 knots

+ 5.3 / -2.65

 Stall speed in level flight, without water ballast, at the corresponding flap position (L,+2,+1,0,-1), in 15 meter configuration L : 69 km/h 37 knots
+2: 69 km/h 37 knots
+1: 72 km/h 39 knots
0 : 75 km/h 40 knots
-1: 76 km/h 41 knots
Max. flap extended speed
setting -1 and 0		 275 km/h
148 knots		 275 km/h
148 knots		 Measured powered rate of climb with flaps position “+2”, flying at a speed of 95…100 km/h (51…54 knots), at sea level:
  2 m/s (395 ft/min) for maximum weight without water ballast
1,2 m/s (235 ft/min) for maximum weight with water ballast
Maximum altitude that can be sustained at standard atmosphere conditions (flaps at “+2”) is:
2800 m (9185 ft) for the maximum weight with water ballast;
3200 m (10500 ft) for the maximum weight without water ballast
Max. flap extended speed
setting +1 through L
Limit load factor *)		 160 km/h
86 knots
+ 4		 160 km/h
86 knots
+ 4		 Best L/D without ballast at 95 km/h (51 knots) 46:1 49:1
      Best L/D with ballast at 115 km/h (62 knots) 47:1 50:1

The data stated in the Flight Manual of each particular glider take precedence over any other information.

More goodies . . .
* LAK PHOTOS (at SSA 2000)
* More LAK photos (at SSA 2001)
* LAK company profile
* LAK-17A flight review

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Last modified: July 30, 2022