Franklin O-335

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Type	Flat-6
Manufacturer	Franklin Engine Company

Type

Flat-6

Manufacturer

The Franklin O-335 (Company designations variations on 6A4) was a series of air-cooled aircraft engines of flat-six configuration.

Design and development

These engines were commonly vertically mounted and used to power many early helicopters in the United States. They were closely related to the 2A4 and 4A4 2- and 4-cylinder engines. In various subtypes, the 6A4 remained in continuous production from 1945 to the time Franklin's United States operations ceased in 1975, with versions continuing in Polish production into the 1990s.

In 1947 this engine was modified into a water-cooled version by the Tucker Car Corporation for use in the 1948 Tucker Sedan. Tucker liked the engine so much that he purchased the Aircooled Motors/Franklin Engine Company and it remained under the ownership of the Tucker family until 1961.

Variants

O-335: Military designation
6A-335: 180 hp (134.2 kW) at 2,800rpm
6AL-335: 150 hp (111.9 kW) at 2,600 rpm
6A4-125: 125 hp (93.2 kW) at 2,200rpm
6A4-130: 130 hp (96.9 kW) at 2,200rpm
6A4-135: 135 hp (100.7 kW) at 2,450rpm
6A4-140: 140 hp (104.4 kW) at 2,375rpm
6A4-145: 145 hp (108.1 kW) at 2,600rpm
6A4-150: 150 hp (111.9 kW) at 2,600rpm
6A4-165: 165 hp (123.0 kW) at 2,800rpm
6A4-200: 200 hp (149.1 kW) at 3,100rpm
6AG-335: 220 hp (164.1 kW) at 3,400rpm
6AG4-185: 185 hp (138.0 kW) at 3,100rpm
6AGS-335: 260 hp (193.9 kW) at 3,400rpm
6AS-335: 240 hp (179.0 kW) at 3,200rpm
6V-335-B: 210 hp (156.6 kW) at 3,100rpm
6V-335-B: 210 hp (156.6 kW) at 3,100rpm
6V-335-A1A: 200 hp (149.1 kW) at 3,100rpm
6V-335-A1B: 200 hp (149.1 kW) at 3,100rpm
6V4-165: 165 hp (123.0 kW)
6V4-178: 178 hp (132.7 kW) at 3,000rpm
6V4-200: 200 hp (149.1 kW) at 3,100rpm
6VS-335: 225 hp (167.8 kW) at 3,200rpm

Applications

Maule M-5-220C Lunar Rocket
Republic RC-3 Seabee
Seibel S-4
Sikorsky S-52
Socata MS.894 Rallye Minerva
Stinson Voyager
Taylorcraft 15
Temco TE-1B
Tucker (automobile)
YT-35 Buckaroo

Specifications (6AL-335 / 6A4-150-B3)

Franklin O-335/6AC Engine.

Data from ^[1]

General characteristics

Type: 6-cylinder air-cooled horizontally opposed direct drive supercharged aircraft piston engine
Bore: 4.5 in (114.3 mm)
Stroke: 3.5 in (88.9 mm)
Displacement: 335 cu in (5.49 l)
Length: 37.4 in (950.0 mm)
Width: 30.8 in (782.3 mm)
Height: 21.6 in (548.6 mm)
Dry weight: 307 lb (139.3 kg)

Components

Valvetrain: OHV, 1x inlet valve, 1x exhaust valve operated by pushrods
Supercharger: mechanically driven supercharger
Fuel system: 1x Marvel-Schebler MA-3SPA updraught carburettor
Fuel type: 80 Octane gasoline
Oil system: 80 S.U. secs (15.6 cs) grade pressure fed at 40 psi (275,790 Pa), wet sump
Cooling system: Air-cooled
Delco-Remy direct cranking electric starter motor

Performance

Power output:
(Take-off): 150 hp (111.9 kW) at 2,600 rpm for take-off
(Normal): 150 hp (111.9 kW) at 2,600 rpm at sea level
(Cruising): 112 hp (83.5 kW) at 2,350 rpm at sea level
Specific power: 0.45 hp/in³ (20.35 kW/l)
Compression ratio: 7:1
Specific fuel consumption: 0.51 lb/hp/hr (0.311 kg/kW/hr, 229.5 US.gal/hp/hr) cruising
Oil consumption: 0.01 lb/hp/hr (0.006 kg/kW/hr, 4.5 US.gal/hp/hr) cruising
Power-to-weight ratio: 0.488hp/lb (0.8kW/kg)
B.m.e.p.: 137 psi (945 kPa)

Notes

↑ Wilkinson, Paul H. (1945). Aircraft Engines of the world 1945. New York: Paul H. Wilkinson. pp. 80–81.

References

Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p. 57
Erickson, Jack. Horizontally Opposed Piston Aero Engines
Wilkinson, Paul H. (1945). Aircraft Engines of the world 1945. New York: Paul H. Wilkinson. pp. 80–81.
US Department of Transportation Federal Aviation Administration Type Certificate Data Sheet E-238 Revision 12, December 8, 1994.

Franklin aircraft engines

Horizontally opposed engines

2A-110
2A-120
2A4-45
2A4-49
2AC-596
2AL-112
4A-225
4A-235
4A4-100
4A4-75
4A4-85
4A4-95
4AC-150
4AC-171
4AC-176
4AC-199
4AC
4ACG-176
4ACG-199
4AL-225
6A-335
6A-350
6A3
6A4
6A4-125
6A4-130
6A4-135
6A4-135
6A4-145
6A4-150
6A4-165
6A4-200
6A8-215
6AC-264
6AC-298
6AC-403
6ACG-264
6ACG-298
6ACGA-403
6ACGSA-403
6ACSA-403
6ACT-298
6ACTS-298
6ACV-245
6ACV-298
6ACV-403
6AG-335
6AG4-185
6AG6-245
6AGS-335
6AGS6-245
6AL-315
6AL-335
6AL-500
6ALG-315
6ALV-335
6AS-335
6AS-350
6V-335-A
6V-335-A1A
6V-335-A1B
6V-335-B
6V-335
6V-350
6V4
6V4-165
6V4-178
6V4-200
6V4-335
6V6-245-B16F
6V6-245
6V6-300-D16FT
6V6-300
6VS-335
8AC-398
8ACG-398
8ACG-538
8ACGSA-538
8ACSA-538
12AC-596
12AC-806
12ACG-596
12ACG-806
12ACGSA-806
Franklin O-175
Franklin O-180
Franklin O-200
Franklin O-300
Franklin O-335
Franklin O-405
Franklin O-425
Franklin O-540
Franklin O-805
Sport 4

v t e United States military piston aircraft engine designation system

H (four-bank H-configuration inline)	H-1640 XH-2240 H-2470 XH-2600 XH-3130 XH-3730 H-4070

I (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-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 XR-7755

V (upright-V inline)	V-720 V-770 V-1150 V-1237 V-1400 V-1410 V-1440 V-1460 V-1510 V-1560 V-1570 V-1650 (L) V-1650 (P) V-1710 V-1950 V-3420

W (three-bank W-configuration inline)	W-2779

See also: X-1800 US military gas turbine aeroengines Piston engine configurations

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