Aviastroitel AC-7M

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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]

Design and development

Development of the AC-7M was started in 2002 and proceeded though 2006 when two prototypes were completed.^[1]

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 of fuel.^[1]^[2]

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]

The AC-7M was later developed into the unpowered and redesigned AC-7.^[3]

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.^[4]

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 10.5 in) diameter

Performance

Cruising speed: 180 km/h (112 mph; 97 kn)
Stall speed: 74 km/h (46 mph; 40 kn)
Never exceed speed: 220 km/h (137 mph; 119 kn)
Range: 1,800 km (1,118 mi; 972 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)

References

↑ 1.0 1.1 1.2 1.3 1.4 1.5 Aviastroitel (2006). "This Russian enterprise Aviastroitel". Retrieved 5 October 2011.
↑ 2.0 2.1 2.2 2.3 2.4 Glider Air Craft (undated). "Motorglider AC-7M". Retrieved 7 October 2011. Check date values in: |date= (help)
↑ Glider Air Craft (undated). "Double seated glider AC-7". Retrieved 10 October 2011. Check date values in: |date= (help)
↑ Glider Air Craft (undated). "Motorglider AC-7K". Retrieved 10 October 2011. Check date values in: |date= (help)

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