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АС-7m is a double-seated motoglider equipped with retractable propeller engine. The pilots are seated side by side.


Engine compartment is located in the middle of the hull. It contains propeller engine. The motoglider is equipped with F30A25A engine, Gobler-Hirthmotoren KG.


Aircraft performance AC-7m

Wing area

13.5 sc.m.

145.3 sc.f

Wing aspect ratio


Tare weight

490 kg

1080 lbs

Maximum flight weight 

680 kg

1499 lbs

Maximum disposable load

190 kg

419 lbs

Range operating overload


Wing loading with flight weight 300 kg 

50 kg/sc.m.

10.04 lbs/sc.f.

Climb of rate

4.5 m/sec

886 f/min


Main dimensions


18 m

59 f

Length of a plane

7.15 m

23.5 f

Height of a plane

1.65 m

5.41 f


Speed measures in a gliding flight

Flight weight

680 kg



Stall speed

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Minimum descent altitude

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at a speed of

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Maximum speed of aerodynamic quality

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Sink rate

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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   

120 km/hour (73 miles/hours, 66 knots)

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


The trapezoid wing of the big lengthening (23,7) has laminar profile FX60-157 with high value of the maximum carrying power.  Specific loading on a wing is limited from 49 kg / sq. m to 53 kg / sq. m depending on weight of useful loading. The glider possesses higly maneuvor properties: time of a rerun for spirals–45 degrees in 45 degrees makes of a list no more than 3,5 seconds. 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. 
Consoles are covered with weight incorporate in the center one adjudting finger having on the end the eccentric for tightening of 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.


Motor-glider AC-7M is equipped by non-withdrawable chassis with two cross-section located wheels of chamber type, a nasal wheel in diameter of 310х12 mm and a tail wheel in diameter of 200х80 mm. The shock-absorber — a rubber package. A cylinder of the basic wheels in diameter 360х160 mm on an external contour of a tire cover contain with the shock-absorber reliably work on absorption of shock loadings. The tail wheel in diameter at landing by the first concerns surface VPP (ВПП). On running by movement it is carried out on two cores and a nasal wheel. In a design of the basic wheels ball bearings, and as the brake of "drum" type put in action with the help of cable rope conducting of type "Bouden" are built in. Brakes cope the management handle.


The spacious cabin of a glider allows to take place conveniently, cross-section, to two 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 a soft and convenient back of sitting. The cabin lantern, gives to both pilots the full review outside spaces within corners not less than 300 degrees: "at the left-upwards-to the right". The lantern opens upwards round a lobby ball-type suspension brackets. 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 pilot-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.


Firm - the manufacturer: Gobler-Hirthmotoren KG
Mark of the engine: F30A25A
The engine 2 tacts, four-cylinder, air cooling. The carburetor with the pumping up pump diaphragm type. For installation on a motor-glider the engine is modified: the exhaust system and the muffler is changed.
The engine is started by an electrostarter.
The electrostarter engine eats from a source of a direct current pressure 12В.
The engine shaft puts in action the combined generator of an alternating current capacity of 90 Vt which serves system of ignition and develops the electric power to charge the starter battery. Devices of control of impellent installation: the electronic tachometer and the thermoelectric indicator are established directly on instrument to a board in a cabin of the pilot.
The fuel system is placed in a special compartment, in a forward part of an impellent compartment and consists of a fuel tank, the fuel crane, the pipelines providing giving of fuel to the carburetor, the drain pipeline and a drainage tube. Fuel structure: gasoline of mark АИ 95 and synthetic oil for 2-h-taktnyh engines mix up in the relation 50:1 accordingly.
Engine key parameters:
Capacity of a take-off mode (макс.) (5 mines) 77.2 kw/105 h.p. (DIN)
Number of rpm of the engine at макс. Capacities of 6250 rpm
Number of rpm of the engine макс. Will continue. On the earth of 5800 rpm
Number of rpm of the engine of small gas on the earth of 3000 rpm
Max. Temperature of goals of the cylinder, not above 260 ° C (500 ° F)


Wooden the 2 blades screw of the fixed step. Diameter of the screw is 1180 mm.