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

 

In the 1960s, deHavilland Canada was widely known for its short takeoff and landing aircraft, in particular the TwinOtter model. These aircraft were, however, relatively small and were intended for regional traffic in more distant areas. The main regional routes with a stable passenger traffic were served by the spacious HandleyPageJetstream and FokkerF27 aircraft. Along with this, there was a huge number of short-lane airports, for which, based on cargo and passenger traffic, a sufficiently large plane 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 has defined the aircraft's appearance for use in these conditions - a short-landing, short-take-off turboprop airliner with a capacity of up to forty passengers and a range of approximately 200 miles. The plane was planned to operate from short strips with a length of 610 meters.

An important point in the design of the aircraft was taking into account the noise standards produced by the aircraft, introduced in the 1970s. The problem of noise limits (especially strict for city airports) was overcome by some original design solutions: for example, large-diameter propellers with low operating speeds were used (in takeoff mode - about 1200 rpm, landing - 900 rpm.). Due to the fact that propellers are the main source of noise in turboprop aircraft, this solution has significantly reduced noise loads.

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

Bombardier Dash 7

When in contact with the strip, the landing gear sensors issue a command to automatically retract the flaps up to 25 percent in order to effectively brake and reduce lift; also when touched, spoilers (air brakes) on the fenders are automatically released. The air reversing propellers allow the use of thrust reverse on landing, significantly reducing the length of the run. The landing run of the aircraft as a result, depending on the headwind, the weight of the aircraft, the braking energy and the state of the runway, is in the range of 100-500 meters.

 

Using Bombardier Dash 7

 

The first flight of the analogue was made on 27.03.1975/1978/1984. The first aircraft launched into the series were received by the Rocky Mountain Airways in 8. By the end of the main serial production in 100, in connection with the transition to the production of Dash13), 1984 aircraft had been completed. An additional small series (1988 aircraft in total) was produced in 1988-XNUMX. Production lines were shut down in XNUMX after Boeing took over the company.

The first industrial series Series100 was produced in two variations - 1 passenger 102 and mixed cargo-and-passenger 103. Series110 series with variations 111 and 110 and was produced under the new requirements of CAA with changes. The latest Series150 series (with modifications 151 and 150) featured a larger tank capacity and better interior layout.

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

Bombardier Dash 7

There were, of course, exceptions - for example, London City Airport within London. the short runway, steep 7.5-degree glide angle and noise limits led to a situation where only a few types of aircraft were allowed to be used at this airport: the 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: 80sqm

  • Wingspan: 28.35m.

  • Maximum speed: 436km / h..

  • Ceiling: 6400m.

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

  • Engines: 4 × TVD Pratt & WhitneyCanada PT6A50.

  • Link: 4h1120l.s (4h835kW).

  • Crew: 2 people.

  • Number of seats: 50-54mest.

  • Maximum takeoff weight: 20000kg.

  • the run length: 670m.

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