The Jacobs R-830 or L-5 is a seven-cylinder, air-cooled, radial engine for aircraft manufactured in the United States, production started in 1935.Gunston 1989, p.85.

Design and development

The R-830 was effectively an enlargement of the R-755 with strengthened stressed parts. With a bore and stroke of 5.0 in × 5.5 in (140 mm × 127 mm) the

displacement Displacement may refer to: Physical sciences Mathematics and Physics * Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path ...

was 831 cu in (13.6 L), takeoff power was around 285 hp (212 kW). The engine features steel cylinders with aluminum-alloy

cylinder head In an internal combustion engine, the cylinder head (often abbreviated to simply "head") sits above the cylinders and forms the roof of the combustion chamber. In sidevalve engines, the head is a simple sheet of metal; whereas in more modern ...

Applications

Beechcraft Model 18 The Beechcraft Model 18 (or "Twin Beech", as it is also known) is a 6- to 11-seat, twin-engined, low-wing, tailwheel light aircraft manufactured by the Beech Aircraft Corporation of Wichita, Kansas. Continuously produced from 1937 to Novem ...

Beechcraft Staggerwing The Beechcraft Model 17 Staggerwing is an American biplane with an atypical negative wing stagger (the lower wing is farther forward than the upper wing). It first flew in 1932. Development At the height of the Great Depression, aircraft ...

Fleet 50 The Fleet 50 Freighter was a Canadian twin-engine biplane general utility aircraft designed and built by Fleet Aircraft. This peculiar-looking aircraft had promise as a freighter and general use aircraft, but it was underpowered and only five we ...

Fleetwings Sea Bird The Fleetwings Sea Bird (or Seabird) was an American-built amphibious aircraft of the 1930s. Design and production The Sea Bird was an amphibious utility aircraft designed in 1934–1935 by James C. Reddig for Fleetwings, Inc., of Bristol, Penn ...

Howard DGA-8 The Howard DGA-8, DGA-9, DGA-11, and DGA-12 were a family of four-place, single-engine, high-wing light monoplanes built by the Howard Aircraft Corporation, Chicago, Illinois from 1936. Development The various models were distinguished by diffe ...

Waco S Series The Waco S Series is a family of American cabin biplanes produced by the Waco Aircraft Company starting in 1935. Development and designations The Waco closed cabin biplanes, initially known as the C (for Cabin) series were all unequal span, stag ...

Specifications (L-5)

References

Notes

Bibliography

*Gunston, Bill. ''World Encyclopedia of Aero Engines''. Cambridge, England. Patrick Stephens Limited, 1989.

External links

The Jacobs Engine - Nanton Lancaster Society
{{US military piston aeroengines 1930s aircraft piston engines Aircraft air-cooled radial piston engines Jacobs aircraft engines