Kamov Ka-26

The Kamov Ka-26 (NATO reporting name Hoodlum) is a Soviet light utility helicopter with co-axial rotors.

Development

The Ka-26 entered production in 1969. 816 have been built. A variant with a single engine was the Ka-126. A turboshaft-powered version is the Ka-226. (All the Ka-26/126/128/226 variants are codenamed "Hoodlum").

Design

The engine of the Ka-26

The fuselage of the Ka-26 consists of a fixed, bubble-shaped cockpit containing the pilot and co-pilot, plus a removable, variable box available in medevac, passenger-carrying and cropduster versions. The helicopter can fly with or without the box attached, giving it much flexibility in use. The Ka-26 is small enough and handles well enough to land on a large truck bed.^{[citation needed]}

The main weakness of the Ka-26 is its engine. It is powered by two 325 hp (239 kW) Vedeneyev M-14V-26 radial engines mounted in off-board nacelles. The reciprocating engines, although more responsive than modern turboshafts, are relatively maintenance intensive. The Ka-26 is underpowered with its two radial engines, especially when used in cropdusting role, where excess payload is common. No other helicopter exists in the world that runs at constant 95% engine power for most of its flight regime.^{[citation needed]} This leaves the pilot with little power reserve for emergencies. Due to frequent overloads, the interconnect shaft which joins the two engines is prone to breakage and requires frequent inspection.

Due to the limitations of the Ka-26, USSR and Romania agreed under the Comecon trade to build a single engine version called Kamov Ka-126 which had better aerodynamics and range.

The standard instrumentation of the Ka-26 resembles that of larger naval Kamovs and is considered excessive for civilian or cropdusting use. The large cockpit panel with its 18 main dials obscures a significant part of the right-downwards view direction from the cabin, which is crucial to avoid telephone and power lines in agricultural and other low-altitude roles. It is common practice to replace the instrument panel with a simplified layout, retaining only the six generally useful dials for better vision.

The low height of the lower rotor requires passengers and crew to approach from the rear when the rotors are turning, as it is low enough to contact a person's head at the front of the aircraft.

Operational history

The Ka-26 was used by some WARPAC armies in the light desant or airborne role, but its slow (150 km/h) cruise speed compared with the Mil-2 (220 km/h) limits its military use but its shorter length (7,75m) compared with the Mil Mi-2 (11,9m) was an advantage when operating in an urban area, also a smaller rotor (13m) than the Mil-2 (14,6m) is an advantage, it has a longer range than the Mil-2 as well. It is, however, eminently useful for cropdusting. The coaxial main rotor configuration, which makes the Ka-26 small and agile, also results in a delicate airflow pattern under the helicopter, providing a thorough yet mild distribution of chemicals onto the plants. The Ka-26 is often used to spray grape farms in Hungary, where conventional "main rotor and tail rotor" layout helicopters would damage or up-root the vine-stocks with their powerful airflow.^{[citation needed]} Hungarian Kamov operators claim that coaxial rotors of the Ka-26 creates an airflow which allows pesticides to settle underneath, rather than on top of, the leaves, this means a much more effective distribution of pesticides, as most pests and parasites do not live on the top side of foliage. Additionally, the coaxial vortex system is symmetrical, allowing the distribution of the pesticide to be more uniform. Symmetrical vortices

Variants

Kamov Ka-26

Ka-26 in Riga aviation museum

Ka-26 Hoodlum-A

One or two crew utility light helicopter, powered by two 325-hp (239-kW) VMK (Vedeneyer) M-14V-26 radial piston engine. 850 built.

Ka-26SS

NOTAR technology testbed for the Ka-118 fitted with tail jet beams.

Ka-126 Hoodlum-B

One or two crew utility light helicopter, powered by one 720-shp (537-kW) OMKB "Mars" (Glushenkov) TVD-100 turboshaft engine. First flown in 1986, built and developed by Industria Aeronautică Română in Romania. 2 prototypes and 15 series helicopter built.

V-60

A prototype light armed escort helicopter based on the Ka-126.

Ka-128

One prototype, powered by a 722-shp (538-kW) Turbomeca Arriel 1D1 turboshaft engine.

Kamov Ka-226

Six or seven seat utility helicopter, powered by two 450-shp (335-kW) Rolls-Royce (Allison ) 250-C20R/2 turboshaft engines.

Operators

 Russia

• Gazpromavia^[1]

 Romania

• West Copter ^[2]

 Hungary

Former operators

 Bulgaria

• Bulgarian Air Force^[3][4]

 Mongolia

• Mongolian Air Force^[5]

 Lithuania

• State Border Guard ^[6]

 Hungary

• Hungarian Air Force^[7][8]

Specifications (Ka-26)

Data from Jane's All The World's Aircraft 1982-83 ^[9]

General characteristics

• Crew: 2
• Capacity: 6 passengers (cargo/passenger pod)
• Payload: 900 kg (1,985 lb) (chemical hopper)
  
  • 1,100 kg (2,425 lb) (flying crane)
• Length: 7.75 m (25 ft 5 in)
• Rotor diameter: 2x 13.00 m (42 ft 8 in)
• Height: 4.05 m (13 ft 3½ in)
• Disc area: 265.5 m² (2,856 ft²)
• Empty weight: 1,950 kg (4,300 lb)
• Max. takeoff weight: 3,250 kg (7,170 lb)
• Powerplant: 2 × Vedeneyev M-14 V-26 radial piston engines, 239 kW (320 hp) each

Performance

• Maximum speed: 170 km/h (91 knots, 105 mph)
• Range: 400 km (215 nmi, 248 mi)(7 passengers, 30 min reserves)
• Endurance: 3 hr 42 min
• Service ceiling: 3,000 m (9,840 ft)
• Disc loading: 12 kg/m² (2.5 lb/ft²)
• Power/mass: 150 W/kg (0.09 hp/lb)

See also

Related development

• Kamov Ka-226

Aircraft of comparable role, configuration and era

• Kaman K-MAX

References

External links

Wikimedia Commons has media related to Kamov Ka-26.

• http://www.kamov.ru/
• http://www.aviation.ru/Ka/#26
• http://www.kamov.net/kamov-civilian/kamov-ka-126/