Mil Mi-1

https://en.wikipedia.org/wiki/Mil_Mi-1

The Mil Mi-1 (USAF/DoD reporting name "Type 32", NATO reporting name "Hare") was
a Soviet three- or four-seat light utility helicopter. It was the first Soviet
helicopter to enter serial production. It is powered by one 575 hp Ivchenko
AI-26V radial. It entered service in 1950 and was first seen on the 1951 Soviet
Aviation Day, Tushino and was produced for 16 years. More than 1,000 were built
in the USSR and 1,594 in Poland, as SM-1.

All early variants seated pilot in front and two passengers behind him, in
common cabin. The first production variant was Mi-1, quickly replaced by
improved Mi-1T, that carried extra operational equipment including full radio
and blind-flying instruments, and had more reliable engine AI-26V. The next
basic variant was the Mi-1A of 1957, with further increased reliability and
provisions for one 160 l external fuel tank.

A new major variant, Mi-1M in 1957 introduced an enlarged cabin and the more
powerful AI-26VF engine, which allowed the accommodation of three passengers on
a bench behind the pilot. Cabin height increased from 1.22 to 1.26 m and width
from 1.01 to 1.2 m. A noticeable difference was horizontal bottom windows line
instead of slanted, with bigger rear side windows, and a less pointed fuselage
nose. It could also be fitted with two external side capsules for the injured or
mail. There were trials of an armed anti-tank variant Mi-1MU carried in 1961,
being the first Soviet attack helicopter, but it did not enter production due to
having a small payload and the cessation of production of the basic variant.

Well over 1,000 of all variants were built in the USSR, including a proportion
of dual-control trainers (with U suffix): Mi-1U, TU, AU, MU, with the instructor
seated behind a trainee. 15 were produced in Moscow in 1950, 30 in Kazan in
1952–1953, 597 in Orenburg in 1954–1958 and 370 in Rostov in 1956–1960. In 1956
license-production of the four-seat model began in Poland, at WSK PZL-Swidnik,
where 1,594 were built until 1965, under the designation SM-1. Several new
versions were developed at Swidnik, including the SM-2 five-seater, with a new
fuselage.


Role
Helicopter

Manufacturer
Mil Moscow Helicopter Plant and other Soviet national plants,
WSK PZL-Swidnik,

First flight
20 September 1948

Introduction
1950

Primary user
Soviet Air Force

Produced
1950–1965

Number built
2,594

Variants
PZL SM-2

Specifications (Mil Mi-1)

General characteristics
Crew: One
Capacity: 2 passengers or 255 kg (561 lb) of cargo
Length: 12.09 m (39 ft 8 in)
Rotor diameter: 14.35 m (47 ft 1 in)
Height: 3.30 m (10 ft 10 in)
Disc area: 161.7 m² (1,740 ft²)
Empty weight: 1,700 kg (3,740 lb)
Loaded weight: 2,140 kg (4,708 lb)
Max. takeoff weight: 2,330 kg (5,126 lb)
Powerplant: 1 × Ivchenko AI-26V radial engine, 429 kW (575 hp)

Performance
Maximum speed: 185 km/h (115 mph)
Range: 430 km (268 mi)
Service ceiling: 3,500 m (11,480 ft)
Rate of climb: 5.3 m/s (1,043 ft/min)
Disc loading: 13 kg/m² (3 lb/ft²)
Power/mass: 0.20 kW/kg (0.12 hp/lb)



*