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Sport solo AC-4 is comfortable, compact, and multipurpose sailplane. 

The design is simple and the construction is easy and convenient. The glider is easily controlled, has excellent pilot characteristics, compact and affordable.



Aircraft performance AC-4

Wing area

7.7 sc.m.

82.9 sc.f

Wing aspect ratio


Tare weight

140 kg

309 lbs

Maximum flight weight 

260 kg

573 lbs

Maximum disposable load

120 kg

25 lbs

Range operating overload


Wing loading with flight weight 210 кг 

27 kg/sc.m.

5,53 lbs/sc.f.

Breaking tension on a tow

500 kg.

1120 lbs

Takeoff run


Landing distance (H=15m)


Stall speed with weight of 260kg

  69 km/hr  


Main dimensions


12.6 m

41.3 f

Length of a plane

5.25 m

17.2 f

Height of a plane

1.25 m

4.1 f


Speed measures in a gliding flight

Flight weight

260 kg

Minimum descent altitude

- [m/sec]

- [f/min]

at a speed of

- [km/h]

- [miles/h]

- [knots]







Maximum speed of aerodynamic quality

- [km/h]

- [miles/h]

- [knots]

Sink rate

- [m/sec]

- [f/min]







Declining in speed 130 км/ч

- [m/sec]

- [f/min]




Restrictions and the basic modes of flight

The maximum aerodynamic quality Кmax (relative range of planning L/H) and value of speeds of the basic modes of flight:



Max. additional speed (Vne)

Max. add. maneuver speed (Va)

220 km/hour (137 miles/hours, 119 knots)

160 km/hour (99 miles/hours, 86 knots)

Corkscrew and figures of difficult pilotage

Deliberate performance of a corkscrew, flights on performance of figures of difficult pilotage are forbidden until the special permission of the Manufacturer

Speed of prelanding planning under normal weather conditions, not less   

100 km/hour (60 miles/hours, 55 knots)


The trapezoid wing of the big lengthening (20,5) has laminar profile FX60-157 with high value of the maximum carrying power.
Specific loading on a wing is in limits from 32.5 kg / sq. m at weight of 250 kg. The glider possesses
higly maneuvor properties: time of a rerun for spirals–45 degrees in 45 degrees makes of a list no more than 3 seconds
at speed of 90 km/hour.
The sinuosity of a surface of a wing along a profile makes 0,1 mm (under the American standard) that corresponds to the
higher range of quality of a surface under the American standard.
Wing consoles with the weigh of 38 kg incorporate in the center with one link-up finger having on the end accentric for
tightening the consoles at joining. Automatic connection of control systems by elerons and air brakes is realized thanks to
system of cross-section drafts with funneled edge lines, incorporating to spherical tips of onboard swings.


Glider AC-4 is equipped by a withdrawable basic wheel of chamber type. Shock-absorbers are absent. The cylinder of a wheel in
diameter of 310 mm on an external contour of a tire cover reliably works on absorption of shock loadings; the tail wheel in
diameter of 200 mm stabilizes rectilinear movement on run. In a design of the basic wheel ball bearings, and as the brake
of "drum" type put in action with the help rope cable of type "Bouden" are built in. The brake copes the
lever of bicycle type established on the handle of management.


The spacious cabin of a glider allows to take place conveniently in it even to broad-shouldered pilots growth 180 - 190 sm,
thus remain enough empty seat in the space of a head and high knees of legs; the pilot cabin is equipped by pedals of a
wheel of a direction regulated on length.
The lantern of a cabin consisting of 2 parts, gives to the pilot the full review out cabin spaces within corners not
less than 300 degrees: "at the left-upwards-to the right". The lantern windshield is fixed, and its central part can open
and lean back to the right thanking ball-type to a suspension bracket.
Emergency dump of a lantern can be executed by moving of two red handles conveniently located on both boards of the bottom
contours of a lantern.
The compact control panel has enough free space for placing of the standard complete set of piloy navigating devices,
plus possibility of a custom-made configuration, including an additional variometer or other devices.
The standard 4 dot fastened system is applied.VHF aerial is placed in keel.