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Continental O-300

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Template:Infobox Aircraft Engine

The Continental O-300 and the C-145 are a family of air-cooled flat-6 piston engines for aircraft.[1]

First produced in 1947, versions were still in production Template:As of. It was produced under licence in the United Kingdom by Rolls-Royce in the 1960s.


File:Field maintenance on a 1956 model Cessna 172.JPG
Continental O-300 engine installation in a Cessna 172

The C-145 was developed from the Template:Convert C-125 engine. Both powerplants share the same crankcase, although the C-145 produces an additional Template:Convert through a longer piston stroke, higher compression ratio of 7.0:1 and different carburetor jetting.[1]

The O-300 is a modernized C-145 and retains the same weight, dimensions, bore, stroke, compression ratio, displacement and output power of the earlier engine.[1]


The GO-300 employs a reduction gearbox, so that the engine turns at 3200 rpm to produce a propeller rpm of 2400. The GO-300 produces Template:Convert whereas the ungeared O-300 produces Template:Convert.[1]

The GO-300 engine has a TBO (Time Between Overhaul) of only 1200 hours, while 1800 hours is the standard for ungeared O-300 engines. The GO-300 engine also suffered reliability problems as a result of pilots mishandling the engine and operating it at too low an engine rpm. This caused the Cessna Skylark to develop a poor reputation for engine reliability. Many Skylarks flying today have been converted to different larger displacement direct drive engines.[2]


Six cylinder, Template:Convert, direct drive engine[1]
Modernized C-145, Template:Convert, direct drive engine[1]
Geared O-300, Template:Convert at 3200 crankshaft rpm, 2400 propeller rpm[1]
Voyager 300
Liquid-cooled, fuel-injected version developing Template:Convert at 2,700 rpm.


Cessna 175 showing the cowling bulge behind the propeller hub created by the GO-300 reduction gearbox



Voyager 300

Specifications (O-300)

Reference: Engines for Homebuilt Aircraft & Ultralights[1] Template:Pistonspecs


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Christy, Joe: Engines for Homebuilt Aircraft & Ultralights, pages 60-63. TAB Books, 1983. ISBN 0-8306-2347-7
  2. Perdue, Scott (undated). A Lark That Won’t Quit. Retrieved on 2008-12-19.
  3. Murphy, Daryl (2006). The Cessnas that got away. Retrieved on 2008-12-22.

Template:Continental aeroengines Template:US military piston aeroengines

This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia article "Continental O-300".