The following outlines the presentation of information in this compilation and is revised from earlier versions. It is hoped that it is reasonably clear, concise, and easy to use.
The bold typeface heading line is of the form:
O-Designation -- {bore / stroke / displacement} / {bore / stroke / displacement}.
The O-Designation follows the US Military convention of O- for horizontally-opposed engines with the displacement, in cubic inches, rounded to the nearest multiple of five. The exceptions are for engines with displacement less than 120 cubic inches, which are rounded to the nearest integer. The compiler has extended the notation so that the engine is air cooled unless an OL-designation is given for liquid cooling, while the OF- designation indicates that the engine control is by a FADEC system, see the Introduction. The engine operates on the four-stroke, Otto cycle unless noted as (2-Stroke and/or Diesel) for a two-stroke cycle and/or Diesel operation; see Example No.1 below.
The bore, stroke, and displacement on the heading line are given initially in dimensions of {inches / inches / cubic inches}, and after the slash (/) in dimensions of {millimeters / millimeters / cubic centimeters}. The dimensions in the ordinary typeface are those used in manufacture of the engine, while those in the italics typeface are their equivalent in the alternative units for the convenience of all readers. Accordingly, the units in italics have been converted by the compiler from the published units in which the engine has been manufactured. Most of the US engines have been built in English units, while most of the engines from elsewhere in the world have been built in metric units.
The next line(s), where applicable, gives the relationship of the bore and stroke of this engine to other engines by the same manufacturer, as displayed in Example No.2 below, but not in Example No.1.
The next line(s) gives the following, in sequence:
Number of cylinders; Manufacturer's Designation; Range of Maximum Continuous Power in horsepower, at the associated Crankshaft Rotational Velocity in revolutions per minute, and, where appropriate, the Maximum Power available for a short time (Take Off, or TO power), at its associated Crankshaft Rotational Velocity; Approximate Production Years (bold if still in production); Weight in pounds (#); Engine Type-Certificate Number and Date of First Certification, in month/day/year notation - certification is by the US (CAA, later FAA) unless otherwise noted.
Notes about the engine are given on the next line(s).
References are given on the next line, see the Reference Material for the explanation of the notation.
Applications are given on the next line(s). The entries include the country of origin for the aircraft (in italics), as displayed in Examples Nos.1 and 2 below.
Example No.1: Aerosport-Rockwell LB600/2.
O-32 (2-Stroke) -- {2.953 / 2.362 / 32.4} / {75 / 60 /530}
2cyl; Aerosport-Rockwell LB600/2; 38hp@5000rpm (single carburetor), 45@5500 (dual carburetor); 1972-1976; Wt = 56-57#; TC = none.
Single-ignition engine.
J72-73toJ75-76.
Applications: (France) Calvel Frelon (Hornet) powered glider; (US) Aerosport Rail twin-engined ultralight [N4334]; PDQ Aircraft Products PDQ-2; Thor Duster BJ-1B.
Example No.2: Aeronca E-107.
O-107 - - {4.125 / 4.0 / 106.9} / {104.8 / 101.6 / 1752}
Same stroke as O-113
2cyl; E-107, -107A; 30hp@2500rpm; 1930-1931; Wt = 114#; TC = Group 2.
Single-ignition engine.
Ae39; H&H; S; U&C.
Applications: (US) Aeronca C-2, PC-2; Cessna EC-2; Long Wimpy.