ѻ Gliders from Aviastroitel

Model A Model A - is the original taildragger model designed in 1992. The runner up to the World Class Design Competition, the design has moved far beyond it original roots. The forward swept wing allows pilot weights of 141 to 242 pounds without installation of ballast. The cockpit includes both rudder pedal adjustment and fully adjustable seat back.


Model B  
Model B - The nosewheel version of the AC-4 has the same performance of the taildragger model, but offers an alternative wheel configuration. It is an excellent solo glider for students transitioning from nosewheel two seaters like the ASK-21. The robust construction holds up well to club use and frequent landings, and the large pneumatic tailwheel absorbs mishandled landings. Ground handling is absolutely feather light, as the sailplane easily pirouettes about its main gear.


Model C  

Model C - is the retractable gear model with increased performance. It is an excellent solo glider for students transitioning from nosewheel two seaters like the ASK-21. Features include automatic control connections on all surfaces, a wide range of pilot weights and heights, adjustable rudder pedals, excellent visibility, and crisp handling. Performance enhancements include an optional retractable main gear, faired tailwheel, wing root fairings, and the same wing finish that has brought praise from flight testers.


 D D - until now it is in the future project. Wing span 13m.


2. -4 General Arrangment



3. -4 Performance
Empty Weight, kg 140

Gross Weight, kg


Wing Span, m


Aspect Ratio


Wing Loading factor (G=250 kg), kg/m²


Wings square, m²


Max speed, km/h


Max Load Factors


Stall speed (G=230 kg), km/h


MAX L/D (V=90 km/h)


MIN sink (V=90 km/h), m/s


Bank switching time responce (45º,V=90 km/h),sec



4. -4 Flight Polar

ac4c-fairings The data of flight polar was extracted thanks to the series of test flights of the AC-4C, onboard 045, executed by Chad Moore (USA).
According to recommendation proposed by Dick Johnson, on the glider AC-4C had been established fairings in a place of fastening of a wing and fuselage. Such type of fairings are established practically on all gliders of the AC series.

Chad Moore published results of the tests in article:
Performance Testing of the Russia AC-4c Retractable”,
printed in the American magazine Soaring, September, 2002.
You can read this paper, downloading Adobe Acrobat file: flighttest.pdf ,250 kb.

AC-4C Flight Polar


5. AC Kits
   Any model of the AC gliders series, including a motoglider, can be delivered as Kits of fast assembly.
Two gliders the AC-4C and motoglider AC-5M have been rigged up and then has taken evaluation tests for certificates and now one's are using to produce flights in the USA and New Zealand.
   Jim Cooper who has rigged AC glider (set 2),
have published the information on a site:  

  - Very detailed description (in photos) the Kit -4c adequate to the requirement of 50 % of readiness.

   Last versions of the Kits represent practically ready glider. To be accomplished the glider rigging by using such a set it is necessary to implement: setup and safetying of details and units of motor-unit, the chassis, flight control drivers and levers. At last, using sandpaper and spatula, produce padding, paint and polish a surface of the glider.

The 1-st KIT has arrived in the Seattle (USA)
Just after unloading... The final action - getting the Certificate!