Four-Stroke Cycle HOAE
by Increasing Displacement

Part 1: O-20 through O-109

These data are Part 1 of 3 for the Single Displacement Table of all Four-Stroke Cycle HOAE. The Table has been divided into three parts. Part 1 on this Webpage is for the introduction to the Table and for displacements from O-20 through O-109. Part 2 is for displacements from O-110 through O-195 and can be found here. Part 3 is for displacements from O-200 through O-1815 and can be reached here.

Examination of the engines in this table indicates how cylinder-size limits have increased over time, at least for the modern engines from Continental, Franklin, and Lycoming. As the engine technology developed, larger cylinders became practical so that comparable power could be obtained for a four- or a six-cylinder engine of about the same displacement and power (Lycoming O-360 and Continental O-360). This enabled tradeoffs to be made; e.g., between cost (fewer cylinders) and smoothness of operation (more cylinders). It also is interesting to note how unsuccessful engines of a given displacement were repeated later in successful engines of about the same displacement, but differing in bore, stroke, technology, and market response (Jacobs did have and Continental does have O-240 and O-360 models).

The horsepower data range is from maximum continuous power to the short-duration power for takeoff. The horsepower range includes all models for a given O-Designation. It must be pointed out that these models may include those with supercharging, turbocharging, fuel-injection, and/or gearing in addition to normally aspirated, carbureted, direct-drive engines. Therefore the extremes of power can be great for quite different engines of the same displacement by the same firm. Generally, adding features which increase the horsepower, the altitude capability, and/or reduction of the propeller tip speed of the engine/propeller system add cost, weight, and complexity to the engine.

The dates given in this table for an engine of a given designation are the approximate dates of development or introduction to the market. It should be borne in mind that these dates are not suitable for the establishment of any historical priority, but are given to establish the approximate date of the technology used.

Designa-	Displace-	HP	Manufacturer & Model	Year	Number of Cylinders
tion	ment:	Range
	cu.in. / cc
O-20	19.8 / 325	5	Ilo Germany	1924	2
O-25	24.6 / 404	7-8	A.B.C. UK	1923	2
O-26	25.9 / 424	10	Zalewski & Falkiewicz Poland	1930	2
O-29	29.3 / 480	25	Lotus (INAV Magnum) 225 UK	1984	2
O-30	30 / 500		Douglas 500cc UK	1922	2
O-31	31.2 / 512	36-41	Dirk 2-500a Australia	1981	2
O-32	31.9 / 523	33	Engine Dynamics O-500L US	1985	2
O-32	32 / 524	20	GPU Surplus 4A032 US	1999		4
O-36	35.8 / 586	10	Prüssing-Sternersen Germany	1924	2
O-36	36.3 / 596	18	Douglas Dot UK	1923	2
O-37	37 / 602	18	Citroën 2CV France	1960	2
O-37	37 / 606	9	Harley-Davidson US	-	2
O-37	37 / 606	35	Rotax 906 Austria	1985	2
OL-42	41.6 / 681	56-60	HKS 700E Japan	1997	2
O-42	42.1 / 689		Coventry Victor O.H.V. IV UK	1924	2
O-42	42.4 / 695	12-20	Morehouse M-42 US	1924	2
O-42	42.4 / 695	25	GPU Surplus 2A042 US	1999	2
O-43	43.3 / 710	18	OMC Cushman 18hp Truckster US	1966	2
O-45	45 / 737	22-30	Douglas 737cc UK	1922	2
O-45	45.4 / 744	22	Douglas Digit UK	1925	2
O-46	45.5 / 745	20	Coventry Victor O.H.V. IV UK	1924	2
O-46	45.5 / 745	16	Siemens-Halske Superior Germany	1924	2
O-46	45.5 / 745	20	Macchi M.B.2 Italy	1948	2
O-46	45.6 / 748	20	Mercedes F-6902 Germany	1919	2
O-46	46 / 760	33	Lefevre F.L. France	1936	2
O-48	47.8 / 783	25-27	1/2 VW / Global US	1980	2
O-48	48.1 / 788	22	OMC Cushman 22hp Truckster US	1966	2
O-49	48.7 / 797	48	Weslake W50 (direct drive) UK	1995	2
O-49	48.7 / 797	58	Hexadyne P60 / Weslake W50 (geared) US	1997	2
O-49	49.1 / 804	23-24	Aero Engines Sprite UK	1936	2
O-52	51.5 / 844	30	DAF 44, 46 Netherlands	1958	2
O-54	53.9 / 884	20	Mercedes F-7502 Germany	1919	2
OL-54	54.4 / 891	40-60	1/2 Subaru EA-82 / Aerotek Canada	1998	2
O-55	54.6 / 894	35	1/3 Corvair / UltraVair US	2003	2
O-55	55.1 / 903	40	Fauvel Pygmée France	1967		4
O-56	55.9 / 916	25-27	Sarolea Epervier Belgium	1934	2
O-55	55.9 / 916	35-40	1/2 VW / IAME KFM 105 Italy	1982	2
O-56	55.9 / 916	35	1/3 (Corvair-VW) / UltraVair US	2004	2
O-56	56.0 / 917	28-35	1/2 VW / various US	1978	2
O-59	58.6 / 961	50	Lotus (INAV Magnum) 450 UK	1984		4
O-59	58.9 / 965	30-35	Bolshevik AMB-20 USSR	1925	2
OL-60	59.6 / 977	55	Subaru EA-52 / Ohnishi Japan	1966		4
O-60	59.8 / 980	70-80	BMW R100 Germany	2000	2
O-61	60.9 / 998	35	Jawa Czechoslovakia	1934	2
OL-61	61.0 / 1000	83	Honda Goldwing GL 1000 Japan/US	1992		4
O-61	61.4 / 1006	38-47	1/2 VW / IMAER 1000 Brazil	1984	2
O-63	63.3 / 1037	32-35	1/2 VW / various US	1974	2
O-65	64.9 / 1064	12-24	Kühne Germany	1924	2
O-66	66.1 / 1083	30-42	1/2 VW / various US	1983	2
OL-66	66.2 / 1085	86	Honda Goldwing GL 1100 Japan/US	1992		4
O-66	66.2 / 1085	100-105	BMW R1100 Germany	2002	2
O-66	66.3 / 1086	25-35	Porsche Type 369 Germany	1950		4
OL-66	66.4 / 1089	60	Subaru EA-61 / Nihon U. Japan	1969		4
O-66	66.5 / 1090	18-21	Ursinus U-2 Germany	1927	2
O-66	66.5 / 1090	25-28	Walter Atom Czechoslovakia	1937	2
O-67	66.5 / 1090	36-38	1/2 VW / Great Plains - Carr US	2001	2
O-67	66.8 / 1095	25-34	Bristol Cherub Series I, II UK	1923	2
O-67	66.8 / 1095	30-35	Sarolea Vautour, Albatross Belgium	1935	2
O-69	68.8 / 1128	15-20	Vaslin France	1922		4
O-69	68.9 / 1130	90-100	BMW R1150 Germany	2004	2
O-69	69.0 / 1131	25-28	VW / Ardem France	1952	4
O-69	69.2 / 1135	10-16	Clerget Model 2 France	1921	2
O-70	69.8 / 1143	37-38	1/2 VW / Hummel US	1983	2
O-71	70.8 / 1160	52	Fauvel Pygmée France	1968		4
O-71	71.4 / 1170	90-100	BMW R1200 Germany	2004	2
O-73	72.7 / 1192	32-40	VW / various Germany	1957		4
O-73	72.7 / 1192	40-50	Weslake W40/50-73-02 UK	1982	2
O-73	72.8 / 1194	45	1/2 VW / Hummel US	2005	2
OL-74	73.9 / 1211	79-81	Rotax 912 Austria	1988		4
OL-74	73.9 / 1211	100-115	Rotax 914 (turbocharged) Austria	1997		4
O-75	74.6 / 1222	65	Citroën GS 1.2 France	1973		4
O-75	74.6 / 1223	24	A.B.C. Scorpion Mk.I UK	1924	2
O-75	74.6 / 1223	36-52	Douglas Dryad UK	1932	2
O-75	74.9 / 1228	32-36	Bristol Cherub Series III UK	1925	2
O-76	76.2 / 1249	25-32	Mengin B, Poinsard France	1933	2
O-77	76.9 / 1260	45-60	Emdair CF 077A, CF 077B UK	1984	2
O-77	77 / 1262	26	Bates US	1924	2
O-78	77.6 / 1272	38	C.N.A. C.II (bis) Italy	1937	2
O-78	78.4 / 1285	40-46	VW / various Germany	1960		4
O-79	78.5 / 1287	38-50	VW / various Germany	1960		4
O-80	79.8 / 1308	24-28	Vaslin France	1923		4
O-80	80.1 / 1312	28	Wright-Morehouse WM-80, Lincoln Rocket US	1925	2
O-81	81.2 / 1330	68-78	Verner 133M Czech Republic	2002	2
OL-82	82.5 / 1352	95-100	Rotax 912S Austria	1998		4
O-83	83.1 / 1362	15	Clerget Model 2A France	1923	2
OL-83	83.1 / 1362	75	Subaru EA-63 / C.G. Taylor US	1977		4
O-85	84.7 / 1388	70-80	Verner VM 1400 Czech Republic	1998	2
O-85	84.7 / 1388	80	Q-Drive QD-1400 Czech Republic	2004	2
O-84	84.8 / 1390		GPU Surplus 4A084 US	1999		4
O-85	85.4 / 1400	18-24	Anzani-Brownback France	1927	2
O-85	85.4 / 1400	38	C.N.A. C.II Italy	1937	2
O-87	86.5 / 1418	36-47	Alta UK	1936	2
O-88	88.2 / 1445	30-35	Narkiewicz Poland	1960	2
O-91	90.8 / 1488	42-50	Porsche Types 527, 528, 546 / Stark Germany	1951		4
O-91	91 / 1490	25-30	Wackett Australia	1924	2
O-91	91.0 / 1491	40-45	Coventry Victor Neptune 1 UK	1925		4
O-91	91.1 / 1492	40	Volante C.C.2 France	1937	2
O-91	91.1 / 1492	42	Agusta G.A.40 Italy	1957	2
O-91	91.1 / 1493	30-37	National 35 US	1934	2
O-91	91.2 / 1493	45-55	VW / various Germany	1964		4
O-92	91.5 / 1500	30-35	Minié 4 B0 Horus France	1937		4
O-92	91.6 / 1500	70	Lafleur France		2
O-92	91.7 / 1502	45	Avia DFTr1.5 Czechoslovakia	1932		4
O-92	91.8 / 1504	34-40	A.B.C. Scorpion Mk.II UK	1924	2
O-92	92 / 1504	40-50	Weir Flat Twin UK	1933	2
O-92	92.0 / 1508	30-40	Mathis G.2F, 2G-60 France	1947	2
O-92	92 / 1508	48	IGC 2byFour US	1995	2
O-92	92.2 / 1510	52-75	Emdair CF 092A, CF 092B UK	1988	2
OL-93	92.9 / 1522	25	Loughead-Stadlman XL-1 US	1919	2
O-93	93.2 / 1527	100	Weslake Type 1527 UK	1978		4
O-95	95.1 / 1559	33-38	Mengin C, Poinsard France	1935	2
O-96	95.9 / 1571	38-40	Aero Engines "1.5 litre engine" UK	1936	2
O-96	96.2 / 1577	30-35	Long Harlequin US	1933	2
O-97	96.6 / 1582	55-75	Porsche Types 678, 702, 616 Germany	1957		4
O-97	96.7 / 1585	50-65	VW / various Germany	1967		4
O-97	96.7 / 1585	56	VW / Aeroálcool Germany/Brazil	2006		4
OL-97	97.4 / 1595	90	Subaru EA-71 / C.G. Taylor US	1975		4
O-98	98.0 / 1606	60	Jabiru 1600 Australia	1992		4
O-98	98.1 / 1607	62-75	Emdair CF 100A UK	1986	2
O-98	98.2 / 1608	32-40	Coventry Victor Neptune 2 UK	1925		4
O-99	99.4 / 1629	60-62	VW / IAME KFM 112E Italy	1987		4
OL-100	100 / 1639	100	RotorWay RW-100 US	1967		4
O-100	100.2 / 1642	53-110	AMI Twin US	1984	2
O-100	100.2 / 1642	52-75	Needleye O-100 US	2002	2
O-100	100.5 / 1646	53	Continental 1/2 O-200 US	2003	2
O-101	100.5 / 1647	16	Kemp G-2 US	1913	2
O-101	100.5 / 1647	-	AMI Twin US	1982	2
O-101	100.5 / 1647	50	Technopower Twin US	1982	2
O-102	102.2 / 1675	26-30	Piaggio & Pegna Italy	1924	2
O-102	102.4 / 1679	55-66	VW / various Germany	1971		4
O-106	105.7 / 1731	80	Aspin Flat-Four UK	1937		4
O-106	106.4 / 1743	35	Lambert H-106 US	1930	2
O-107	106.9 / 1752	30	Aeronca E-107 US	1930	2
O-107	107.1 / 1756	55-66	VW / various Germany	1991		4
O-108	108.3 / 1775	58-62	VW / various Germany	1982		4
OL-109	108.7 / 1782	100-140	Subaru EA-81, EA-82 / various Japan	1980		4

The Table is continued in Part 2: O-110 through O-195 found here and is concluded in Part 3: O-200 through OL-1815 found here.

Four-Stroke Cycle HOAE
by Increasing Displacement

Part 1: O-20 through O-109

CONTENTS

Updated 2/4/08

Four-Stroke Cycle HOAE by Increasing Displacement

Part 1: O-20 through O-109

CONTENTS

Updated 2/4/08

Four-Stroke Cycle HOAE
by Increasing Displacement