Continental Tiara series
{{Short description|Family of aircraft engines}}
| {{Infobox aircraft begin
|name= Tiara series |image=Rolls-Royce Continental Tiara 0-405 RRHT Derby.jpg|thumb|Rolls-Royce Continental Tiara 0-405 |caption=Tiara 0-405 on display at the Rolls-Royce Heritage Trust Derby }}{{Infobox aircraft engine |type=Piston aircraft engine |manufacturer= Teledyne Continental Motors |first run= 1960s |major applications= Piper PA-36 Pawnee Brave |produced=1969–1975 |number built = |program cost = |unit cost = |developed from = |developed into = |variants with their own articles = }} |
The Continental Tiara series are a family of air-cooled, horizontally opposed aircraft engines. Designed and built by Continental Motors/TCM, the Tiara series were commercially unsuccessful, costing the company millions of dollars.
Design and development
Continental began development of the Tiara series in 1965.Leyes, p.119 At the time, CAE, Continental Motor's turbine engine subsidiary, had developed the T65, a small turboshaft engine which was being considered by Bell for its new Model 206 helicopter. Faced with having to fund the production tooling for the T65 in order to keep the price reasonable, or funding the Tiara series, Continental's corporate management chose to invest in the Tiaras.
While the Tiara series were basically traditional boxer engines, they did have some unique features.Gunston, p.191 The engines had high rotational speeds, 0.5:1 gearing was used to reduce propeller speed, with the camshaft forming an extension of the propeller shaft.[http://home.comcast.net/~aeroengine/Continental1.html Continental, Teledyne Continental Motors, TCM (US); Rolls-Royce (UK) Part 1: Introduction and O-110 through OL-300] {{webarchive |url=https://web.archive.org/web/20081202141950/http://home.comcast.net/~aeroengine/Continental1.html |date=December 2, 2008 }} The propeller shaft featured the Hydra-Torque drive to reduce the shaft's vibrations. The engines were available with four, six- and eight-cylinders. All were fuel-injected, with turbocharging being optional.
The engines' fuel consumption was high, which became a disadvantage during the 1973 oil crisis era. In addition, the Tiaras' performance was not significantly improved over existing engines, making it difficult for aircraft manufacturers to justify the costs of certificating their products for the engines. These problems led Continental to finally discontinue the engines in 1980.
Series
=Four-cylinder=
;Tiara 4-180 (O-270)
:180 hp, 271 cu in capacity
=Six-cylinder=
;Tiara 6-260 (O-405)
:260 hp, 406 cu in capacity
;Tiara 6-260A
;Tiara 6-285 (O-405)
:285 hp, 406 cu in capacity
;Tiara 6-285A:
;Tiara 6-320 (O-405)
:300 hp, 406 cu in capacity
;Tiara T6-260 (O-405)
:260 hp, 406 cu in capacity, turbocharged
;Tiara T6-285 (O-405)
:285 hp, 406 cu in capacity, turbocharged
;Tiara T6-320 (O-405)
:300 hp, 406 cu in capacity, turbocharged
=Eight-cylinder=
;Tiara 8-380 (O-540)
:380 hp, 541 cu in
;Tiara T8-450 (O-540)
:450 hp, 541 cu in, turbocharged
Applications
=Tiara 6=
- Cerva CE.44 Couguar
- Cierva CR.640 (not built)
- Piper PA-36-285 Pawnee Brave
- Robin HR100/285TR Tiara
- Spencer S-12-EAir Car (prototype)
- Transavia PL-12 T-320 Airtruk
- Trident Trigull (prototypes)
Specifications (Tiara 6-285-A)
{{pistonspecs
|
|type=6-cylinder, horizontally opposed piston engine
|bore=4.875 in (124 mm)
|stroke=3.625 in (92 mm)
|displacement=406 in³ (6.65 L)
|length=
|diameter=
|width=
|height=
|weight=375 lb (170 kg) dry
|valvetrain=
|supercharger=
|turbocharger=
|fuelsystem=Fuel Injected
|fueltype=100/100LL avgas
|oilsystem=5 US quarts (4.7 L), wet sump
|coolingsystem=Air-cooled
|power=285 hp (212 kW) at 4000 rpm
|specpower=
|compression=9.0:1
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight=
}}
See also
References
{{reflist}}
- {{cite book |last= Gunston |first= Bill |title= The Development of Piston Aero Engines, 2nd Edition |year= 1999 |publisher= Patrick Stephens, Haynes Publishing |location= Sparkford, Somerset, England, UK |isbn= 0-7509-4478-1 |pages= 191 }}
- {{cite book|last= Leyes II |first= Richard A. |author2=William A. Fleming |title= The History of North American Small Gas Turbine Aircraft Engines |publisher= Smithsonian Institution |location= Washington, DC |date= 1999 |isbn= 1-56347-332-1 |url= https://books.google.com/books?id=V0SnFt8JGokC&pg=PA119|page= 119 }}
- {{cite book |last= Smith |first= Herschel |title= A History of Aircraft Piston Engines |publisher= Sunflower University Press |date= 1986 |isbn = 0-89745-079-5 |pages= 206 }}
External links
- [https://web.archive.org/web/20070809111515/http://tcmlink.com/fiddefault.aspx Teledyne Continental Motors]
- [http://www.flightglobal.com/pdfarchive/view/1968/1968%20-%201553.html?search=Hydra-Torque Flight International, 15 August 1968]
- [http://www.flightglobal.com/pdfarchive/view/1970/1970%20-%200261.html New Continental engine, Flight International, 12 February 1970]
- [http://www.flightglobal.com/pdfarchive/view/1974/1974%20-%200954.html World Aero-engine industry, Flight International, 20 June 1974]
{{Teledyne Continental aeroengines}}
{{DEFAULTSORT:Continental Tiara Series}}