Canada 20 Dollars Silver Coin 1999 de Havilland Canada DHC-6 Twin Otter
Aviation Commemoratives
Obverse: Profile portrait of Her Majesty Queen Elizabeth II created in 1990 and notable for the grand jewelled tiara and a beautiful string of pearls, this royal effigy was designed by Canadian artist Dora de Pedery-Hunt.
Lettering: ELIZABETH II D·G·REGINA · 1999 ·
Reverse: de Havilland Canada DHC-6 Twin Otter in flight. Portrait of George Arthur Neal in 24-karat gold-plated cameo, denomination below.
Lettering: CANADA 20 DOLLARS RRC
Engraver: Peter Mossman.
Edge: Reeded & Plain Sections.
Diameter: 38 mm.
Weight: 31.103 g.
Material: Silver.
Fineness: 0.925.
Denomination: 20 Canadian Dollars.
Produced By: Royal Canadian Mint.
de Havilland Canada DHC-6 Twin Otter
The de Havilland Canada DHC-6 Twin Otter is a Canadian 19-passenger STOL (Short Takeoff and Landing) utility aircraft developed by de Havilland Canada and currently produced by Viking Air. The aircraft's fixed tricycle undercarriage, STOL abilities and high rate of climb have made it a successful cargo, regional passenger airliner and Medevac aircraft. In addition, the Twin Otter has been popular with commercial skydiving operations, and is used by the United States Army Parachute Team and the United States Air Force's 98th Flying Training Squadron.
Design and development
Development of the aircraft began in 1964, with the first flight on May 20, 1965. A twin-engine replacement for the single-engine DHC-3 Otter retaining DHC's renowned STOL qualities, design features included double-slotted trailing edge flaps and ailerons that work in unison with the flaps to boost STOL performance. The availability of the 550 shp (410 kW) Pratt & Whitney Canada PT6A-20 turboprop in the early 1960s made the concept of a twin more feasible. To bush operators, the improved reliability of turboprop power and the improved performance of a twin-engine configuration made it an immediately popular alternative to the piston-powered Otter which had been flying since 1951.
The first six aircraft produced were designated Series 1, indicating that they were prototype aircraft. The initial production run consisted of Series 100 aircraft, serial number seven to 115 inclusive. In 1968, Series 200 production began with serial number 116. Changes made at the beginning of Series 200 production included improving the STOL performance, adding a longer nose that was equipped with a larger baggage compartment (except for aircraft fitted with floats) and fitting a larger door to the rear baggage compartment. All Series 1, 100 and 200 aircraft and their variants (110, 210) were fitted with the 550 shaft-horsepower PT6A-20 engines.
In 1969, the Series 300 was introduced, beginning with serial number 231. Both aircraft performance and payload were improved by fitting more powerful PT6A-27 engines. This was a 680 hp (510 kW) engine that was flat-rated to 620 hp (460 kW) for use in the Series 300 Twin Otter. The Series 300 proved to be the most successful variant by far, with 614 Series 300 aircraft and their sub-variants (Series 310 for United Kingdom operators, Series 320 for Australian operators, etc.) sold before production in Toronto by de Havilland Canada ended in 1988.
New production
After Series 300 production ended, the remaining tooling was purchased by Viking Air of Victoria, British Columbia, who manufacture replacement parts for all of the out-of-production de Havilland Canada aircraft. On February 24, 2006, Viking purchased the type certificates from Bombardier Aerospace for all the out-of-production de Havilland DHC-1 through DHC-7 aircraft. The ownership of the certificates gives Viking the exclusive right to manufacture new aircraft.
On July 17, 2006, at the Farnborough Air Show, Viking Air announced its intention to offer a Series 400 Twin Otter. On April 2, 2007, Viking announced that with 27 orders and options in hand, it was restarting production of the Twin Otter, equipped with a more powerful Pratt & Whitney Canada PT6A-34 engine. As of November 2007, 40 firm orders and 10 options had been taken and a new final assembly plant established in Calgary, Alberta. Zimex Aviation of Switzerland received the first new production aircraft, serial number 845, in July 2010. By mid 2014, Viking had built 55 new aircraft at their Calgary facility surpassing serial number 900. The production rate as of summer 2014 was approximately 24 aircraft per year. In April 2015, Viking announced a reduction of the production rate to 18 aircraft per year. On June 17, 2015 Viking further announced a partnership with a Chinese firm, Reignwood Aviation Group. The group will purchase 50 airplanes and become the exclusive representatives for new Series 400 Twin Otters in China.
Major changes introduced with the Series 400 include Honeywell Primus Apex fully integrated avionics, deletion of the AC electrical system, deletion of the beta backup system, modernization of the electrical and lighting system, and use of composites for non-load-bearing structures such as doors.
Operational history
Twin Otters could be delivered directly from the factory with floats, skis or tricycle landing gear fittings, making them adaptable bush planes for remote and northern areas. Areas including Canada and the United States, (specifically Alaska) saw much of the demand. Many Twin Otters still serve in the far north, but they can also be found in Africa, Australia, Asia, Antarctica and other regions where bush planes are the optimum means of travel. Their versatility and maneuverability have made them popular in areas with difficult flying environments such as Papua New Guinea. In Norway, the Twin Otter paved the way for the network of short-field airports, connecting rural areas with larger towns. The Twin Otter showed outstanding reliability, and remained in service until 2000 on certain routes. Widerøe of Norway was, at one time, the world's largest operator of Twin Otters. During one period of its tenure in Norway, the Twin Otter fleet achieved over 96,000 cycles (takeoff, flight and landing) per year.
A number of commuter airlines in the United States got their start by operating Twin Otters in scheduled passenger operations. Houston Metro Airlines (which later changed its name to Metro Airlines) constructed their own STOLport airstrip with a passenger terminal and maintenance hangar in Clear Lake City, Texas near the NASA Johnson Space Center. The Clear Lake City STOLport was specifically designed for Twin Otter operations. According to the February 1976 edition of the Official Airline Guide (OAG), Houston Metro operated 22 round-trip flights every weekday at this time between Clear Lake City (CLC) and Houston Intercontinental Airport (IAH, now Houston George Bush Intercontinental Airport) in a scheduled passenger airline shuttle operation. Houston Metro had agreements in place for connecting passenger feed services with Continental Airlines and Eastern Airlines at Houston Intercontinental, with this major airport having a dedicated STOL landing area at the time specifically for Twin Otter flight operations. The Clear Lake City STOLport is no longer in existence.
The Walt Disney World resort in Florida was also served with scheduled airline flights operated with Twin Otter aircraft. The Walt Disney World Airport (WDS), also known as the Lake Buena Vista STOLport, was a private airfield constructed by the Walt Disney Company with Twin Otter operations in mind. In the early 1970s, Shawnee Airlines operated scheduled Twin Otter flights between the Disney resort and nearby Orlando Jetport (MCO, now Orlando International Airport) as well as to Tampa International Airport (TPA). This service by Shawnee Airlines is mentioned in the "Air Commuter Section" of the Sept, 6, 1972 Eastern Air Lines system timetable as a connecting service to and from Eastern flights. This STOL airfield is no longer in use.
Another commuter airline in the U.S., Rocky Mountain Airways, operated Twin Otters from the Lake County Airport in Leadville, CO. At an elevation of 9,927 feet above mean sea level, this airport is the highest airfield in the U.S. ever to have received scheduled passenger airline service, thus demonstrating the wide ranging flight capabilities exhibited by the Twin Otter. Rocky Mountain Airways went on to become the worldwide launch customer for the larger, four-engine de Havilland Canada DHC-7 Dash 7 STOL turboprop but continued to operate the Twin Otter as well.
Larger airlines in the U.S. and Canada also flew Twin Otters. Alaska Airlines, the original Frontier Airlines (1950-1986) and Wien Air Alaska as well as Canada's First Air were air carriers that flew Boeing 727 jetliners as well as earlier versions of the Boeing 737 jetliner at the time. All four airlines also operated Twin Otter aircraft. Ozark Air Lines was primarily a McDonnell Douglas DC-9 jetliner operator that also flew Twin Otters. South Pacific Island Airways flew Twin Otters as well as Boeing 707 jets. In addition, the Canadian air carriers; Pacific Western Airlines (PWA) and Transair, (which operated Boeing 737s), both flew Twin Otter aircraft as well. Two other Canadian airlines that flew Twin Otters; Time Air and Norcanair, also operated Fokker F28 Fellowship passenger jets. Twin Otter aircraft were also operated by commuter or regional airlines and painted in the liveries of such air carriers as Continental Airlines, Eastern Airlines and British Airways have provided connecting feeder service for these respective major airlines in the past. In many cases, the excellent operating economics of the Twin Otter allowed airlines large and small to provide scheduled passenger flights to communities that most likely would otherwise never have received air service.
Twin Otters are also a staple of Antarctic transportation. Four Twin Otters are employed by the British Antarctic Survey on research and supply flights, and several are employed by the United States Antarctic Program via contract with Kenn Borek Air. On April 24–25, 2001, two Twin Otters performed the only winter flight to Amundsen–Scott South Pole Station to perform a medical evacuation.
The Argentine Air Force has used the Twin Otter in Antarctica since the 1970s with at least one of them deployed year-round at Marambio Base. The Chilean Air Force has operated the type since 1980, usually having an example based at Presidente Frei Antarctic base of the South Shetland islands.
As of August 2006, a total of 584 Twin Otter aircraft (all variants) remain in service worldwide. Major operators include: Libyan Arab Airlines (16), Maldivian Air Taxi (22), Trans Maldivian Airways (23), Kenn Borek Air (42) and Scenic Airlines (11). Some 115 airlines operate smaller numbers of the aircraft including Yeti Airlines in Nepal, Malaysia Airlines (which uses the Twin Otter exclusively for passenger and freight transportation to the Kelabit Highlands region in Sarawak), and in the United Kingdom the FlyBe franchise operator Loganair which uses the aircraft to service the island of Barra in the Hebrides islands. This daily scheduled service is unique as the aircraft lands on the beach and the schedule is partly influenced by the tide tables. Trials in Barra with heavier planes than the Twin Otter, like the Short Belfast, failed because they sunk in the sand. The Twin Otter is also used for landing at the world's shortest commercial runway on the Caribbean island of Saba, Netherlands Antilles.
Ontario's Ministry of Natural Resources is also a long-time operator of the Twin Otter.
Transport Canada still owns three DHC-6 Twin Otter aircraft, but they now see very limited flying time, as their role in coastal surveillance has been assumed by a fleet of DHC-8s.
The Twin Otter has been popular with commercial skydiving operations. It can carry up to 22 skydivers to over 13,500 ft (a large load compared to most other aircraft in the industry); presently, the Twin Otter is used in skydiving operations in many countries. The United States Air Force operates three Twin Otters for the United States Air Force Academy's skydiving team.
On 26 April 2001, the first ever air rescue during polar winter from the South Pole occurred with a ski-equipped Twin Otter operated by Kenn Borek Air.
On September 25, 2008, the Series 400 Technology Demonstrator achieved "power on" status in advance of an official rollout. First flight of the Series 400 technical demonstrator, C-FDHT, took place October 1, 2008, at Victoria Airport. Two days later, the aircraft departed Victoria for a ferry flight to Orlando, Florida, site of the 2008 National Business Aviation Association (NBAA) Conference and exhibition. The first new build Series 400 Twin Otter (SN 845) made its first flight on February 16, 2010, in Calgary, Alberta. Transport Canada presented Viking Air Limited with an amended DHC-6 Type Certificate including the Series 400 on July 21, 2010.
George Arthur Neal
George has accumulated 13,500 flying hours on over 85 differnet types of landplane, seaplane, skiplane, amphibian, flying boat, single prop, multi prop, turbo prop, jet, helicopter and glider. He has flown in 38 different countries, the furthest north being Thule, Greenland, and the furthest south Punta Arenas, Chile. He has flown the Atlantic four times via Santo Maria and once via Iceland and operated in temperatures from -30°F to +120°F.
George did the Prototype testing on the Chipmunk, Beaver, Turbo Beaver, Otter and Caribou. He carried out the First experimental STOL work on the single engine Otter with blown elevator and rudder, and extra large flap, demonstrating the aircraft at Rockcliffe. He pioneered and demonstrated STOL characteristics in the Beaver, Otter and Caribou to customers from all over the world.
Canadian Coins
Canada 20 Dollars Silver Coin 1999 de Havilland Canada DHC-6 Twin Otter