de Havilland Canada Dash 7 Wallpapers

de Havilland Canada Dash 7Aircraft - photo wallpapers; Megawallpapers.org : The de Havilland Canada DHC-7, popularly known as the Dash 7, is a turboprop-powered regional airliner with STOL capabilities. It first flew in 1975 and remained in production until 1988 when the parent company, de Havilland Canada, was purchased by Boeing. In the 1960s, de Havilland Canada was already well known throughout the world for their series of high-performance STOL aircraft, notably the very popular Twin Otter. However these aircraft were generally fairly small and served outlying routes, as opposed to the main feederliner routes which were already well served by larger, higher-performance aircraft such as the Handley Page Jetstream and Fokker F27. The de Havilland Canada company felt they could compete with these [br]designs in a roundabout way. With their excellent STOL performance, [br]their designs could fly into smaller airports more centrally located in [br]city centers, with runways that the other aircraft could not easily [br]use. The original specification called for a 40-passenger aircraft with [br]a fairly short range of 200 statute miles, operating from runways only [br]2,000 ft long. With new noise restrictions coming into effect throughout the 1970s, [br]an aircraft tailored for this role would have to be very quiet. To meet [br]this restriction, the new design used oversized propellers geared to [br]spin at a slower speed than normal; much of the sound from a propeller [br]is generated at the tips which are spinning near the speed of sound, [br]and therefore, by reducing the number of RPM this noise goes away. The [br]Dash 7 often landed with only 900 RPM, and took off at only 1,200. In other respects, the new DHC-7 was essentially a four-engine [br]version of the Twin Otter. The general layout remained similar, with a [br]large T-tail intended to keep the elevator clear of the propwash during [br]takeoff, a high aspect ratio [br]high-mounted wing, and most details of the cockpit and nose profile. [br]Changes included the addition of cabin pressurization which required a [br]switch to a fuselage with a circular cross-section, and landing gear [br]that folded rearward into the inner engine nacelles. Most of the rear wing was spanned by a complex double Fowler flap [br]arrangement for high low-speed lift. The Twin Otter also included [br]"flapperons" that drooped the airlerons as part of the flaps, but these [br]were removed due to safety concerns. Instead the airlerons were reduced [br]in size to allow more flap area, and were so small that they had to be [br]aided by spoilers. On touchdown, hydraulic pressure was automatically [br]reduced in the flaps, allowing them to "blow back" to the 25% position [br]and thus "drop" the aircraft to the runway for better braking [br]performance. The four-engine layout aided lift at low speeds due to the [br]wide span of the propellers blowing air over the wing. When the engines [br]were reversed on landing the props "stole" airflow from the wing, [br]further decreasing lift and increasing the effectiveness of the brakes. [br]More importantly, if an engine failed the asymmetric thrust was much [br]less than on a twin-engine layout, thereby increasing safety and [br]allowing for a lower minimum control speed with an engine inoperative (Vmc). The engines could actually produce drag in flight at idle speed, allowing fine control of the glide slope.[br]Country of origin: Canada [br]_________________________________________________________________________________________________ [br]Engines: four 1120hp Pratt & Whitney PT6A-50 turboprops [br]_________________________________________________________________________________________________ [br]Wingspan: 28.35 m (93ft) [br]_________________________________________________________________________________________________ [br]Lenght: 24.58 m (80ft 8in) [br]_________________________________________________________________________________________________ [br]Height: 7.98 m (26ft 2in) [br]_________________________________________________________________________________________________ [br]Weight loaded: 19.985 kg (44,000lb) [br]_________________________________________________________________________________________________ [br]Cruising speed: 426 km/h (265mph) at 2440 m (8000ft) [br]_________________________________________________________________________________________________ [br]Service celling: 7193 m (23,600ft) [br]_________________________________________________________________________________________________ [br]Range: 1295 km (805 miles) [br]_________________________________________________________________________________________________ [br]Passengers + crew: 50 + 2 [br]_________________________________________________________________________________________________

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de Havilland Canada Dash 7 Wallpapers @ Mega Wallpapers (08 Edition)