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DESIGN PHILOSOPHY: Civil STOL transport - the original design objective was to carry 40 passengers a distance of 200 statute miles using runways 2,000 ft long (sea level,
ISA+15°C). This necessitated 4 engines to provide the required airfield performance while allowing for an engine failure at any point during takeoff or landing. The "full-span flap" concept used on the earlier
STOL designs was abandoned for the Dash-7 in order to meet failure analysis cases in the lateral control system. The flap is a double-slotted type over 80% of the wing span. It uses a large-chord, one-piece foreflap on
each wing and moves aft and down on tracks to give a very large chord extension at the 25° position. Quick acting trailing flap segments (3 segments per wing) extend to 45° for STOL landings. The Dash-7 was
de Havilland's first pressurized design. SERIES 1 S/N 1 & 2: Pre-production aircraft, used for demonstration and engineering
development purposes SERIES 100
S/N 3 to 110, except S/N 102: These include Models 102 (Passenger) and Models 103 (Cargo/Passenger) SERIES 150 S/N 102,
111 and subsequent: These aircraft have higher operating weights, provisions for increased fuel capacity (center section tanks) and a number of product improvements, particularly in cabin furnishings and lighting
SERIES 200 was a proposed version to be fitted with PT6A-50/7 engines, which would provide increased power under hot and high altitude conditions, thereby improving performance. None was
produced Models 110 (Passenger configuration) and Models 111
(Cargo/Passenger) include additional options and mods to comply with the UK CAA regulations (CAA TCDS FA26). Note that in the CAA TC and DHC's technical documentation these aircraft are called 'Series 110/111' rather than 'Models 110/111', which is unfortunate since they can be derived from either Series 100 or Series 150. Thus, for example, s/n 111 nowadays operated by the British Antarctic Survey, would have to be (and is) called 'Series 150 Series 110'. Also note that Series 150-based Series 110/111 are limited by the CAA TC to 44,000 Lb MTOW.
The main differences between the series are summarized below: |
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SERIES |
100 |
150 |
200 |
ENGINES |
PT6A-50 |
PT6A-50 |
PT6A-50/7 |
MAXIMUM POWER (S/L, ISA, Static) |
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Takeoff (5 Minutes) |
1,120 SHP |
1,120 SHP |
1,120 SHP |
Max. Continuous |
973 SHP |
973 SHP |
1,050 SHP |
Max. Climb & Cruise |
900 SHP |
900 SHP |
1,050 SHP |
WEIGHT (lb) |
Maximum Takeoff |
44,000 |
47,000 |
44,000 |
Maximum Landing |
42,000 |
45,000 |
44,000 |
Maximum Zero Fuel |
39,000 |
39,000 |
39,000 |
0.W.E. (Typical) |
27,600 |
27,480 |
27,300 |
Wing Loading (lb/sq ft) |
51.2 |
54.7 |
51.2 |
Power Loading (lb/shp) |
9.8 |
10.5 |
9.8 |
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Dash-7 Fleet Statistics (as of April 2006) |
Total Aircraft Produced |
113 |
1975 - 1988 |
Total Aircraft Crashed |
6 |
(unofficial stats) |
Total Aircraft Parked/Scrapped |
35 (?) |
(unofficial stats) |
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PROPULSION |
Engines: |
4 x P&WC PT6A-50 (Turboprop) |
Shaft Horsepower: |
1,120 |
Propellers: |
Hamilton Standard 4Bladed, Full-Feathering, Reversible |
EXTERNAL DIMENSIONS |
Wing Span |
93 ft 0 in |
Length |
80 ft 6 in |
Height |
26 ft 2 in |
Tailplane Span |
31 ft 0 in |
Wheel Track |
23 ft 6 in |
Wheel Base |
27 ft 6 in |
Wing Area |
860 sq ft |
Aileron Area |
23.2 sq ft |
Flap Area |
294 sq ft |
Vertical Tail Surfaces |
170 sq ft |
Horizontal Tail Surfaces |
217 sq ft |
INTERNAL DIMENSIONS |
Cabin Length |
39 ft 6 in |
Maximum Width |
8 ft 6 in |
Maximum Height |
6 ft 4.5 in |
Floor Area |
247 sq ft |
Volume |
1,910 cu ft |
Cabin Door - Passenger |
30 x 69 in |
Cabin Door - Baggage |
33 x 40 in |
Total Baggage Volume |
240 cu ft |
Passenger Seats (Standard) |
50 |
PERFORMANCE |
Maximum Cruise Speed
(at 15,000 ft) |
227 kt |
Stalling Speed (CAS) |
66 kt |
Rate of Climb (@ S/L, ISA): |
- 4 Engines, MCR |
1,200 fpm |
- 3 Engines, MCP |
700 fpm |
Enroute Ceiling (@ ISA) - |
- 4 Engines, MCR |
20,900 ft |
- 3 Engines, MCP |
12,700 ft |
Takeoff Field Length |
2,260 ft |
Landing Field Length |
1,950 ft |
Payload/Range (at 15,000 ft,
100 NM Div + 45 Min Reserve) |
400 NM / 11,400 lb |
1100 NM / 6,400 lb |
1140 NM / 0 lb |
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