Lorraine Algol
1930s French piston aircraft engine
title: "Lorraine Algol" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["lorraine-aircraft-engines", "1930s-aircraft-piston-engines", "aircraft-air-cooled-radial-piston-engines"] description: "1930s French piston aircraft engine" topic_path: "general/lorraine-aircraft-engines" source: "https://en.wikipedia.org/wiki/Lorraine_Algol" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary 1930s French piston aircraft engine ::
::data[format=table title="infobox aero engine"]
| Field | Value |
|---|---|
| name | Algol |
| image | Lorraine Algol 9Na.jpg |
| engine_type | 9-cylinder air-cooled radial aircraft engine |
| manufacturer | Société Lorraine, Argenteuil, Paris |
| national_origin | France |
| major_applications | Bloch 120 |
| variants_with_their_own_articles | Lorraine Sirius |
| :: |
| name=Algol | image=Lorraine Algol 9Na.jpg | caption= |engine_type=9-cylinder air-cooled radial aircraft engine |manufacturer=Société Lorraine, Argenteuil, Paris |designer= |national_origin=France |first_run= |major_applications=Bloch 120 |produced= |number_built= |developed_from= |variants_with_their_own_articles=Lorraine Sirius
The Lorraine 9N Algol was a French 9-cylinder radial aeroengine built and used in the 1930s. It was rated at up to 500 hp, but more usually in the 300 - range.
Design and development
The Algol was a conventionally laid out radial engine, with nine cylinders in a single row. The crankcase was a barrel-shaped aluminium alloy casting, with an internal integral diaphragm which held the front crankshaft bearing. Forward of the diaphragm there was an integrally cast cam-gear case for the double track cam-ring. The reduction gear was housed under a domed casing attached to the front of the crankcase.
Flange-mounted steel barrels were bolted to the crankcase and enclosed with cast aluminium alloy, screwed-on, cylinder head with integral cooling fins. The pistons were also made of aluminium alloy and had floating gudgeon pins. The nine pistons drove the single throw crankshaft via one channel-section master rod and eight circular section auxiliary rods. The master rod had an integral, split type big-end. The crankshaft was machined from a single forging, with bolt-on balance weights.
The Algol had a single pair of overhead inlet and exhaust valves per cylinder. The cam-ring drove roller tappets, mounted in the cam-case, which in turn operated rocker arms, fitted with ball bearings, via pushrods. The cam-ring was concentric with the crankshaft and driven via epicyclic gears.
Most Algols were conventionally aspirated via a single carburetter but at least one 1938 variant used a form of fuel injection, where fuel was blown into the induction system rather than the cylinder head.
Variants
;9A: ;9Ab: ;9Ac: ;9Ad: ;9N Algol: ;9Na Algol: ;9N Algol-Junior ;9N Algol-Major ;9N Algol-Amelioré ;Type 120 500 hp: A developed version with supercharger and reduction gear giving 500 hp at 3000 m
Applications
- ANF Les Mureaux 120
- Bernard 161
- Bloch 120
- Bloch MB.500
- Caudron C.180
- FBA 290
- Loire 11
- Potez 33
- Potez 40
- PWS-24
- Romano R.16
- SAB-SEMA 12
- Lorraine-Hanriot LH.70
- Weymann 66
Specifications
and start a new, fully-formatted line with -- |ref=Jane's All the World's Aircraft 1938 |type=9-cylinder single row supercharged radial |bore=140 mm (5.51 in) |stroke=150 mm (5.90 in) |displacement=20.78 L (1,268 cu in) |length=1.347 m (53.2 in) |diameter=1.275 m (50.2 in) |weight=complete 390 kg (860 lb) |valvetrain=one inlet and one exhaust overhead valve per cylinder, operated with rocker arms, pushrod driven via roller tappets bearing on a double track cam-ring |supercharger= |turbocharger= |fuelsystem=single Stromberg carburettor, heated by exhaust |fueltype=petrol |oilsystem= |coolingsystem=air-cooled |power=rated 221 kW (296 hp) |specpower= |compression=6:1 |fuelcon= |specfuelcon= |oilcon= |power/weight=
|designer= |reduction_gear=11:17
|general_other= |components_other= |performance_other=
|see also= |related= |similar aircraft= |lists=
References
References
- (November 1938). "Société Nationale de Constructions de Moteurs: Argentuil". SNCM.
- Parmentier, Bruno. "Sema 12". Aviafrance.
- Grey, C.G.. (1972). "Jane's All the World's Aircraft 1938". David & Charles.
- "To Paris".
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