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de Havilland
DHC-6 Twin Otter |
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DESIGN PHILOSOPHY:
Twin-engine, turbine-powered STOL utility aircraft with more cabin space and payload capability than the DHC-3 Otter. Convertibility to
floats, intermediate-flotation tires and skis was a consideration from the outset.Four basic "Series" have been produced: SERIES 1:
Prototype and 4 pre-production aircraft (S/N 1- 5). Maximum number of seats limited to 16 by the approved seating arrangement.SERIES 100:
S/N 6 -115. These aircraft had a larger door on the left side of the cabin (56 x 50 in vs. 46.5 x 45.5 in on the Series 1), and provisions for double seats on the right side of the cabin, thereby increasing the maximum number of seats to 21. The Series 1 and 100 were characterized by a "Short Nose" with a baggage compartment door on the front of the aircraft.
SERIES 200: S/N 116 - 230 (Except 130 & 210 which were converted to Series 300). The Series 200 was characterized by a longer nose containing a larger forward baggage compartment, an
extended (shelf) rear baggage compartment and larger baggage compartment doors. SERIES 300: S/N 130, 210, 231 & subsequent. This was the final production model and is characterized by
having PT6-A27 engines, higher operating weights, escape hatches in the forward part of the cabin and deletion of the roof hatch. Conversion to a floatplane requires installation of the "short nose". The maximum number
of seats is 22. Certification was completed to CAR-3 and SFAR-23 regulations. SERIES 400: New-production aircraft with PT6A-34/35 engines, glass cockpit, and numerous product improvements.
Following the acquisition from Bombardier in early 2006 of Type Certificates and all legal rights to all out-of-production de Havilland aircraft, Viking Air of Victoria, British Columbia, announced in April 2007 its intention to proceed with
restarting production of Twin Otters. On Oct.1, 2008, the Series 400 Demonstrator (Series 300 refurbished and modified to the Series 400 standard) made its first flight.
Significant variants within these series include: SERIES 110, 210, 310: Certificated to British C.A.A. requirements, including short field performance. SERIES 320:
Certificated to Australian D.C.A. requirements The main differences between the series are summarized below: |
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SERIES |
1 |
100/200 |
300 |
ENGINES |
PT6A-20 |
PT6A-20 |
PT6A-27 |
MAXIMUM POWER (S/L, ISA, Static) |
Takeoff (5 Minutes) |
550 SHP |
550 SHP |
620 SHP |
Max. Continuous |
550 SHP |
550 SHP |
620 SHP |
Max. Climb |
538 SHP |
538 SHP |
588 SHP |
Max. Cruise |
495 SHP |
495 SHP |
588 SHP |
WEIGHT (lb) |
Maximum Takeoff |
11,000 |
11,579 |
12,500 |
Maximum Landing |
11,000 |
11,400 |
12,300 |
0.W.E. (Typical) |
7,000 |
7,200 |
7,440 |
Wing Loading (lb/sq ft) |
26.2 |
27.6 |
29.8 |
Power Loading (Ib/shp) |
10.0 |
10.5 |
10.1 |
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DHC-6 Twin Otter Fleet Statistics (as of March 2003) |
Total Aircraft Produced |
844 |
1966 - 1988 |
Total Aircraft Crashed |
201 |
(unofficial stats) |
Total Aircraft Parked/Scrapped |
54 |
(unofficial stats) |
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PROPULSION |
Engines: |
2 x P&WC PT6-A27 (Turboprop) |
Shaft Horsepower: |
620 |
Propellers: |
Hartzell 3-Bladed, Full-Feathering, Reversible |
EXTERNAL DIMENSIONS |
Wing Span |
65 ft 0 in |
Length |
51 ft 9 in |
Height |
19 ft 6 in |
Tailplane Span |
.20 ft 8 in |
Wheel Track |
12 ft 2 in |
Wheel Base |
14 ft 10.5 in |
Wing Area |
420.0 sq ft |
Aileron Area |
33.2 sq ft |
Flap Area |
112.2 sq ft |
Fin Area |
48.0 sq ft |
Rudder Area (Incl. tab) |
34.0 sq ft |
Tailplane Area |
100.0 sq ft |
Elevator Area (Incl. tabs) |
35.0 sq ft |
INTERNAL DIMENSIONS |
Cabin Length |
18 ft 6 in |
Maximum Width |
63.25 in |
Maximum Height |
59.0 in |
Floor Area |
80.2 sq ft |
Volume |
384 cu ft |
Cabin Doors - Left |
56 x 50 in |
Cabin Doors - Right |
30 x 45.5 in |
Total Baggage Volume |
126 cu ft |
Passenger Seats (max) |
22 |
PERFORMANCE |
Maximum Operating Speed |
170 Knots |
Maximum Cruise Speed at 10,000 ft |
182 Knots |
Stalling Speed |
56 Knots |
Rate of Climb at SL - 2 Engines |
1,600 ft/min |
Rate of Climb at SL - 1 Engine |
340 ft/min |
Service Ceiling - 2 Engines |
26,700 ft |
Service Ceiling - 1 Engine |
11,600 ft |
Payload/Range (Normal Tanks,
45 Min Reserve): |
100 NM / 4,280 lb |
400 NM / 3,250 lb |
775 NM / 0 lb |
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