The Jacobs R-830 or L-5 is a seven-cylinder, air-cooled, radial engine for aircraft manufactured in the United States by the

Jacobs Aircraft Engine Company The Jacobs Aircraft Engine Company was an American aircraft engine manufacturer that existed from 1926 to 1956. History Early years The Jacobs Aircraft Engine Company was formed in 1926 in Philadelphia. Later the company moved to Pottstown, Pe ...

, beginning 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 Stroke is a medical condition in which poor cerebral circulation, blood flow to a part of the brain causes cell death. There are two main types of stroke: brain ischemia, ischemic, due to lack of blood flow, and intracranial hemorrhage, hemor ...

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 A cylinder () has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base. A cylinder may also be defined as an infinite ...

with aluminum-alloy

cylinder head In a piston engine, the cylinder head sits above the cylinders, forming the roof of the combustion chamber. In sidevalve engines the head is a simple plate of metal containing the spark plugs and possibly heat dissipation fins. In more modern ...

Applications

* Beechcraft Model 18B & S18B Expeditor * Beechcraft B17B and C17B Staggerwing * Fleet 50J Freighter (prototype only) * Fleetwings Sea Bird * Howard DGA-9 * Spartan 7X Executive (prototype only) * Waco ZKC-S, ZKS-6 & 7 Standard Cabins * Waco YOC-1 ZQC-6 ZGC-7 Custom Cabins * Waco ZVN-8 Custom Cabin * Waco ZPF-6 and ZPF-7

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