Bombardier Dash 7
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Bombardier Dash 7

Bombardier Dash 7. A photo. Video. Characteristics. Reviews.

Bombardier Dash 7 - Canadian regional turboprop aircraft airliner landing and short takeoff. Designed and manufactured in the company deHavillandCanada 1975-1988, 113 just built copies.

Design. aircraft design

B1960-e years, the company deHavilland Canada was widely known for short landing and take-off aircraft, in particular - the TwinOtter model. These aircraft, however, were relatively small and were intended for regional transport in more distant areas. The main regional routes with stable passenger traffic were served by spacious HandleyPageJetstream and FokkerF27 aircraft. Along with this, there was a huge number of airports with a short lane, for the maintenance of which, on the basis of cargo turnover and passenger traffic, a sufficiently large aircraft was needed.

Bombardier Dash 7

Some of these airports (especially the old ones) were located close to the center of large cities. Based on market research, deHavilland Canada determined the appearance of the aircraft for use in such conditions - a short-landing and take-off turboprop aircraft with a capacity of up to forty passengers and a range of about 200 miles. The aircraft was planned to be operated from short lanes from 610 meters in length.

An important point in the design of the aircraft was taking into account the noise standards produced by the aircraft, introduced in 1970-s. The problem of noise limits (especially strict for city airports) was overcome by some original design solutions: for example, large-diameter propellers with small working turns were used (in take-off mode - around 1200 revolutions per minute, landing - 900 revolutions per minute.). Due to the fact that propellers are the main source of noise in a turboprop aircraft, this solution has reduced to a large extent noise loads.

To obtain the characteristics of a short landing and take-off of the aircraft (landing speed of about 140 kilometers per hour), the following aerodynamic scheme was used: a high-glider with four engines, enhanced wing mechanization, blown flow from the screws (which increases lift), and tail T-shaped tail. Most of the area of ​​the rear wing fragments is occupied by the Fowler double complex flap, which at low speeds creates a large lift. The ailerons are relatively small in area, but can play the role of air brakes at low speeds.

Bombardier Dash 7

Upon contact with the strip, the chassis sensors issue a command to automatically clean the flap up to 25 percent, in order to effectively brake and reduce lift; also when touching, interceptors (air brakes) on the wings are automatically released. Air reversing screws allow the landing to apply a thrust reverser, reducing to a large extent the path length. Landing mileage of the aircraft as a result, depending on the headwind, aircraft mass, braking energy and the state of the strip is in the 100-500 range of meters.

Using the Bombardier Dash 7

The first analog flight was made by 27.03.1975. The first aircraft launched into the series were obtained by the aviation company RockyMountainAirways in 1978. By the end of the main mass production in (1984 year, in connection with the transition to the manufacture of Dash8), postromlm 100 aircraft. An additional small series (total 13 aircraft) was released in 1984-1988. Production lines in 1988 were stopped after Boeing bought out the company.

The first industrial series, Series100, was manufactured in two variations: the 1 passenger 102 and the 103 combined passenger-and-freight combination. The Series110 series, with variations of 111 and 110, was also released under the new CAA requirements with changes. The latest Series150 series (with modifications of 151 and 150) was distinguished by a larger tank capacity and better interior layout.

The success of the Dash7 model in the market was moderate and did not fully meet the expectations of the developer. Most of the air carriers used this aircraft for transportation to rather large airports, where short landing and take-off properties are in little demand. An aircraft with four engines requires twice as much maintenance as the more common twin-engine turboprop aircraft, which increases the total cost of operation. The number of airports where the properties of the aircraft were in demand, in general, was small.

Bombardier Dash 7

There were, of course, exceptions - for example, London City Airport inside London. the short run, the steep angle of the 7.5 glide slope and the noise limits led to a situation where only a few types of aircraft were allowed to be used at this airport: Dash7 was one of them.

It has also been used in high-altitude airports with a short GDP, on short local lines in different countries, often in underdeveloped areas with not very developed infrastructure of airfields.

Airlines operating the airplane:. AirGreenland (Greenland), PelitaAirService (Indonesia), PetroleumAirServices (Egypt, VoyageurAirways and TransCapitalAir (Canada) also operates a US military aircraft.

The characteristics of the aircraft BombardierDash 7:

  • Length: 24.58m.

  • Height: 7.98m.

  • Empty weight: 12540 kg.

  • Wing area: 80kv.m.

  • Wingspan: 28.35m.

  • Maximum speed: 436km / h..

  • Ceiling: 6400m.

  • Flight range with maximum load: 1240km (Series150 - 2110km).

  • Engines: 4 × Pratt & WhitneyCanada PT6A50.

  • Link: 4h1120l.s (4h835kW).

  • Crew: 2cheloveka.

  • Number of seats: 50-54mest.

  • Maximum takeoff weight: 20000kg.

  • the run length: 670m.

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