DHC-1
DHC-2
DHC-3
DHC-4
DHC-5
DHC-6
DHC-7
DHC-8

de Havilland DHC-7 Dash-7

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+15C). 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:

SERIES

100

150

200

ENGINES

PT6A-50

PT6A-50

PT6A-50/7

MAXIMUM POWER (S/L, ISA, Static)

     

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

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)

Dash-7 Production List ...

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

[DHC-1] [DHC-2] [DHC-3] [DHC-4] [DHC-5] [DHC-6] [DHC-7] [DHC-8]

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Copyright 2002 XdH Aviation Services Inc.  All rights reserved.