Aviastroitel AC-7M

The Aviastroitel AC-7M is a Russian mid-wing, T-tailed, two-seats in side-by-side configuration motor glider that was designed by Vladimir Egorovich Fedorov and produced by Aviastroitel, now Glider Air Craft.[1][2][3]

AC-7M
Role Motor glider
National origin Russia
Manufacturer Aviastroitel
Designer Vladimir Egorovich Fedorov
First flight 2005
Introduction 2006
Status In production (2011)
Number built at least two
Variants Aviastroitel AC-7

Design and development

Development of the AC-7M was started in 2002, it was first flown in 2005 and by 2006 two prototypes had been completed.[1][3]

The AC-7M is a conventional self-launching sailplane, but is equipped with a more powerful retractable pusher configuration Hirth F30A25A 77.2 kW (104 hp) two stroke engine than is normal in these types, allowing it to be also used as a glider tug and as touring motor glider. The aircraft is capable of cruising at 180 km/h (112 mph) for 1,800 km (1,118 mi) while burning only 9 litres per hour (2.0 imp gal/h; 2.4 US gal/h) of fuel.[1][2][3]

The AC-7M uses a two bladed wooden propeller of 1.18 m (46 in) diameter. The 18 m (59.1 ft) span wing employs a Wortmann FX60-157 airfoil and mounts Fowler flaps. The wings are mounted on the fuselage with a single cam-pin and the ailerons and air brakes hook-up automatically. The fixed landing gear consists of a narrow track pair of rubber-suspended 360 mm (14.2 in) main wheels, a 310 mm (12.2 in) nose wheel and a 200 mm (7.9 in) tail caster. The main wheels incorporate lever-actuated drum brakes. The cockpit can accommodate pilots up to 190 cm (74.8 in) in height. The canopy provides 300° field of view and is jettisonable. Assembly from its trailer takes four people 20 minutes.[1][2][3]

The AC-7M was later developed into the unpowered and redesigned AC-7.[4]

Variants
AC-7M
Side-by-side, two seat motor glider with a retractable Hirth F30A25A 77.2 kW (104 hp) two stroke engine.[1][2]
AC-7K
Development of the AC-7M, but with a fuselage-mounted Rotax 912ULS 73.5 kW (99 hp) four stroke engine, driving a retractable 1.18 m (46 in) diameter, two bladed wooden propeller.[5]

Specifications (AC-7M)

Data from Company[1][2]

General characteristics

  • Crew: one
  • Capacity: one passenger
  • Length: 7.15 m (23 ft 5 in)
  • Wingspan: 18 m (59 ft 1 in)
  • Height: 1.65 m (5 ft 5 in)
  • Wing area: 13.5 m2 (145 sq ft)
  • Aspect ratio: 24:1
  • Empty weight: 490 kg (1,080 lb)
  • Gross weight: 680 kg (1,499 lb)
  • Powerplant: 1 × Hirth F30A25A , 77.2 kW (103.5 hp)
  • Propellers: 2-bladed, 1.180 m (3 ft 10 in) diameter

Performance

  • Cruise speed: 180 km/h (110 mph, 97 kn)
  • Stall speed: 74 km/h (46 mph, 40 kn)
  • Never exceed speed: 220 km/h (140 mph, 120 kn)
  • Range: 1,800 km (1,100 mi, 970 nmi)
  • g limits: +5.3/-2.65
  • Maximum glide ratio: 38:1 at 105 km/h (65 mph)
  • Rate of climb: 4.5 m/s (890 ft/min)
  • Rate of sink: 0.8 m/s (160 ft/min) at 110 km/h (68 mph)
  • Wing loading: 50 kg/m2 (10 lb/sq ft)
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See also

References
  1. Aviastroitel (2006). "This Russian enterprise Aviastroitel". Retrieved 5 October 2011.
  2. Glider Air Craft (n.d.). "Motorglider AC-7M". Archived from the original on 22 October 2011. Retrieved 7 October 2011.
  3. Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015-16, page 174. Flying Pages Europe SARL, 2015. ISSN 1368-485X
  4. Glider Air Craft (n.d.). "Double seated glider AC-7". Archived from the original on 22 October 2011. Retrieved 10 October 2011.
  5. Glider Air Craft (n.d.). "Motorglider AC-7K". Archived from the original on 22 October 2011. Retrieved 10 October 2011.
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