# Jacobs R-830 > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Jacobs_R-830 > Markdown URL: https://mediated.wiki/source/Jacobs_R-830.md > Source: https://en.wikipedia.org/wiki/Jacobs_R-830 > Source revision: 1347778277 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) 285 hp radial aircraft engine R-830 Type Radial engine Manufacturer Jacobs Aircraft Engine Company First run 1935 Developed from Jacobs R-755 Developed into Jacobs R-915 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](/source/Jacobs_Aircraft_Engine_Company), beginning in 1935.[1] ## Design and development The R-830 was effectively an enlargement of the [R-755](/source/Jacobs_R-755) with strengthened stressed parts. With a [bore](/source/Bore_(engine)) and [stroke](/source/Stroke_(engine)) of 5.0 in × 5.5 in (140 mm × 127 mm) the [displacement](/source/Engine_displacement) was 831 cu in (13.6 L), takeoff power was around 285 hp (212 kW). The engine features steel [cylinders](/source/Cylinder_(engine)) with aluminum-alloy [cylinder heads](/source/Cylinder_head). ## Applications - [Beechcraft Model 18B & S18B Expeditor](/source/Beechcraft_Model_18) - [Beechcraft B17B and C17B Staggerwing](/source/Beechcraft_Staggerwing) - [Fleet 50J Freighter](/source/Fleet_50_Freighter) (prototype only) - [Fleetwings Sea Bird](/source/Fleetwings_Sea_Bird) - [Howard DGA-9](/source/Howard_DGA-8) - [Spartan 7X Executive](/source/Spartan_Executive) (prototype only) - [Waco ZKC-S, ZKS-6 & 7 Standard Cabins](/source/Waco_Standard_Cabin_series) - [Waco YOC-1 ZQC-6 ZGC-7 Custom Cabins](/source/Waco_Custom_Cabin_series) - [Waco ZVN-8 Custom Cabin](/source/Waco_N_series) - [Waco ZPF-6 and ZPF-7](/source/Waco_F_series) ## Specifications (L-5) *Data from* FAA TCDS[2] ### General characteristics - **Type:** 7-cylinder air-cooled radial piston engine - **[Bore](/source/Bore_(engine)):** 5.5 in (140 mm) - **[Stroke](/source/Stroke_(engine)):** 5.0 in (127 mm) - **[Displacement](/source/Engine_displacement):** 831 cu in (13.6 L) - **[Dry weight](/source/Dry_weight):** 515 lb (234 kg) ### Components - **[Valvetrain](/source/Valvetrain):** 2 valves per cylinder (pushrod-actuated); sodium cooled exhaust valves - **Fuel system:** [Stromberg](/source/Stromberg_carburettor) NA-R7A carburetor - **Fuel type:** 73 [octane](/source/Octane) - **Cooling system:** Air-cooled - **[Reduction gear](/source/Propeller_speed_reduction_unit):** Direct drive, right hand tractor ### Performance - **Power output:** 285 hp (212 kW) at 2,000 rpm at sea level - **[Compression ratio](/source/Compression_ratio):** 6:1 - **[Power-to-weight ratio](/source/Power-to-weight_ratio):** 0.55 hp/lb (0.9 kW/kg) ## See also **Related development** - [Jacobs R-755](/source/Jacobs_R-755) - [Jacobs R-915](/source/Jacobs_R-915) **Comparable engines** - [Armstrong Siddeley Cheetah](/source/Armstrong_Siddeley_Cheetah) **Related lists** - [List of aircraft engines](/source/List_of_aircraft_engines) ## References ### Notes 1. **[^](#cite_ref-1)** Gunston 1989, p.85. 1. **[^](#cite_ref-2)** [FAA TCDS](http://rgl.faa.gov/Regulatory_and_Guidance_library/rgMakeModel.nsf/0/4a68bef3caaa7c6186256bcf0041c9b1/%24FILE/E-156.pdf) Retrieved: 31 January 2009 ### Bibliography - Gunston, Bill. *World Encyclopedia of Aero Engines*. Cambridge, England. Patrick Stephens Limited, 1989. [ISBN](/source/ISBN_(identifier)) [1-85260-163-9](https://en.wikipedia.org/wiki/Special:BookSources/1-85260-163-9) ## External links - [The Jacobs Engine - Nanton Lancaster Society](https://web.archive.org/web/20080609180228/http://www.lancastermuseum.ca/s,jacobsengine.html) v t e Jacobs aircraft engines Radial engines R-755/L-4 R-830/L-5 R-915/L-6 v t e United States military piston aircraft engine designation system H (four-bank H-configuration inline) H-1640 XH-2240 XH-2470 XH-2600 XH-3130 XH-3730 H-4070 IV (inverted-V inline) IV-1430 IV-2040 IV-2220 L (single-bank inline) L-330 L-365 L-375 L-390 L-410 L-440 L-510 L-825 O (opposed) O-15 O-40 O-45 O-90 O-100 O-145 O-150 O-170 O-175 O-180 O-190 O-200 (C) O-200 (F) O-205 O-235 O-290 O-300 O-335 O-360 (C) O-360 (L) O-405 O-425 O-435 O-470 O-480 O-520 O-540 (F) O-540 (L) O-550 O-580 O-805 O-1230 R (radial) R-250 R-265 R-270 R-370 (LB) R-370 (K) R-420 R-440 R-500 R-540 (W) R-540 (K) R-545 R-550 R-600 R-670 R-680 R-720 R-755 R-760 R-790 R-830 R-915 R-975 DR-980 R-985 R-1044 R-1300 R-1340 R-1454 R-1510 R-1535 R-1640 R-1670 R-1690 R-1740 R-1750 R-1820 R-1830 R-1860 R-2000 R-2060 R-2160 R-2180 R-2600 R-2800 R-3350 R-4090 R-4360 R-7755 V (upright-V inline) V-720 V-1150 V-1237 V-1400 V-1440 V-1460 V-1510 V-1560 V-1570 V-1650 (P) V-1710 V-1950 V-3420 V (inverted-V inline) V-770 V-1650 (L) VG (inverted-V inline) VG-1410 W (three-bank W-configuration inline) W-2779 See also: X-1800 US military gas turbine aeroengines Piston engine configurations --- Adapted from the Wikipedia article [Jacobs R-830](https://en.wikipedia.org/wiki/Jacobs_R-830) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Jacobs_R-830?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.