Franklin 6 series
| Franklin 6 series engines | |
|---|---|
 | |
| Type | 6-cyl. horizontally opposed air-cooled piston engine |
| National origin | United States |
| Manufacturer | Franklin Engine Company |
| Variants | Franklin O-335 |
The Franklin 6 is a series of air-cooled aircraft and helicopter engines of flat-6 configuration, produced from the 1930s to the 1970s, that found widespread use in helicopters and some light aircraft, (Military designation O-335, O-405 and O-425), as well as in the 1948 Tucker Sedan (with the engine modified for water cooling).
Variants
- 6A-335
- 180hp@2800rpm-200@3100; 1963-1976
- 6A-350
- 205hp@2800rpm-235@3200; 1965-2002
- 6A4-125
- 125hp@2200rpm; 1945-1949
- 6A4-130
- 130hp@2200rpm; 1945-1949
- 6A4-135
- 135hp@2450rpm; 1945-1949
- 6A4-140
- 140hp@2375rpm; 1945-1949
- 6A4-145
- 145hp@2600rpm; 1945-1949
- 6A4-150
- 150hp@2600rpm; 1945-1975
- 6A4-165
- 165hp@2800rpm; 1947-1975
- 6A4-200
- 200hp@3100rpm; 1952-1953
- 6A8-215
- 215hp@2500rpm; 1945-1951
- 6AC-264
- 110hp@2600rpm-120@2600;
- 6AC-298
- 130hp@2600rpm -155@2930; 1941-1945
- 6AC-403
- 200hp@2750rpm; 1942-1946
- 6ACG-264
- 138hp@3100rpm
- 6ACG-298-P5
- 160hp@3200rpm; 1941-1945;
- 6ACGSA-403
- 250hp@3200rpm; 1942-1946
- 6ACSA-403
- 220hp@2750rpm; 1942-1946
- 6ACT-298
- 150hp@3000rpm ; 1941-1945
- 6ACTS-298-K4
- O-300-5; the O-300-7 produced 175@3000
- 6ACTS-298
- 160hp@3200rpm; 1941-1945
- 6ACV-245
- 245hp@3275rpm; 1944-1958
- 6ACV-298
- 160hp@3250rpm; 1944-1946
- 6ACV-403
- 235hp@3275rpm; 1942-1946
- 6ACV-403
- 245hp@3275rpm; 1942-1946
- 6AG-335
- 220hp@3400rpm; 1963-1976
- 6AG4-185
- 185hp@3100rpm; 1947-1950
- 6AG6-245
- 240hp@3200rpm, 245@3300 (TO)
- 6AGS-335
- 260hp@3400rpm; 1963-1976
- 6AGS6-245
- 250hp@3200rpm; 1944-1948
- 6AL-315
- 175hp@N/Arpm; 1944-1945
- 6ALG-315
- 175hp@N/Arpm; 1944-1945
- 6AS-335
- 240hp@3200rpm; 1964-1976
- 6AS-350
- 235hp@2800rpm; 1968-1996
- 6V-335-A
- 210hp@3100rpm; 1956-1964
- 6V-335-A1A
- 200hp@3100rpm; 1959-1964
- 6V-335-A1B
- 200hp@3100rpm; 1959-1964
- 6V-335-B
- 210hp@3100rpm; 1956-1964
- 6V-350
- 235hp@3200rpm; 1964-1996
- 6V4-165
- 165hp@N/Arpm; 1947-1950
- 6V4-178
- 178hp@3000rpm; 1946-1960
- 6V4-200
- 200hp@3100rpm; 1946-1970
- 6V6-245-B16F
- 245hp@3275rpm; 1944-1958
- 6V6-300-D16FT
- 285hp@3275rpm, 300@3275 + Boost (TO); 1955-1960
- 6VS-335
- 225hp@3200rpm; 1959-1964
- Franklin O-335
- Military designation
- Franklin O-405
- Military designation for the Franklin 6-ACV-405
- XO-405-1 - 6AC-403
- XO-405-3 - 6ACSA-403 (10.2:1 supercharger ratio)
- O-405-3 - 6ACGSA-403
- XO-405-5
- O-405-7 - 6ACGSA-403
- O-405-9 - 6ACV-403 verticla mount for H-6/R-6 & H-7/R-7 helicopters
- O-405-11 - 6ACGSA-403
- XO-425-1
- Military designation for the Franklin 6ACV-425
- O-425-3
- O-425-5
- for Convair L-13
Applications
- Aero-Flight Streak-165
- Aeronca 15AC Sedan
- Bartlett LC-13A
- Bell 47
- Bell HTL
- Bellanca 14-13
- Bunyard BAX-3 Sportsman
- C.L.A.S.S. BushCaddy L 164
- Cessna 170
- Cessna 172
- Cessna 175
- Convair 106 Skycoach
- Convair L-13
- Culver XPQ-15
- Culver XTD3C-1
- Doman LZ-1A
- Doman LZ-2A Pelican
- Fairchild XUC-86B
- Fleetwings XBQ-1
- Goodyear GA-1 Duck
- Goodyear GA-2B Duck
- H-13 Sioux
- Hiller 360
- Hiller H-23 Raven
- Hiller HTE
- Hiller UH-12B
- Hirth Acrostar Mk.I
- Jovair 4E Sedan
- Kaiser Magic
- Kellett XR-8
- M-26 Iskierka
- M-5-220C
- Maule M-4
- McCulloch HUM-1
- McCulloch MC-4C
- McCulloch YH-30
- McKinnie 165
- Omega BS-1
- Piaggio P.136-L
- Procair F.15D Picchio
- PZL M-20 Mewa
- Republic RC-1 Thunderbolt
- Republic RC-3 Seabee
- Republic YOA-15
- Seibel S-4B
- SIAI-Marchetti S.205
- Sikorsky HO5S
- Sikorsky R-7
- Sikorsky S-52
- Sikorsky XR-6
- Sikorsky YH-18
- Socata MS 894 Commodore 220
- Socata Rallye 220GT
- Socata Silvercraft SH-4
- Southern Aerocar
- Stinson 108
- Taylorcraft 15A
- Temco TE-1B
- Temco YT-35 Buckaroo
- Van's RV-8
- Waco Minerva 220
- Waco Model W Aristocraft
- Wagner Sky-Trac 1
- Wagner Sky-Trac 3
- Wagner Sky-Trac 4 Aerocar
- Wittman Big X
- Zenith CH-801
Specifications (6ACV-403)
Data from [3]
General characteristics
- Type: 6-cylinder air-cooled horizontally opposed vertically mounted helicopter piston engine
- Bore: 4.625 in (117.5 mm)
- Stroke: 4 in (101.6 mm)
- Displacement: 403 cu in (6.60 l)
- Width: 33.7 in (856.0 mm)
- Height: 43.4 in (1,102.4 mm)
- Dry weight: 458 lb (207.7 kg)
Components
- Valvetrain: OHV, 1x inlet valve, 1x exhaust valve operated by pushrods
- Fuel system: 2x Bendix-Stromberg PS-5C pressure updraught carburettors
- Fuel type: 80 Octane gasoline
- Oil system: 120 S.U. secs (25.1 cs) grade pressure fed at 55 psi (379,212 Pa), dry sump
- Cooling system: Air-cooled
- Delco-Remy 108567-541 vertical geared electric starter motor
Performance
- Power output: 245 hp (182.7 kW) at 3,275 rpm for take-off
- Specific power: 0.61 hp/in³ (27.758 kW/l)
- Compression ratio: 7:1
- Specific fuel consumption: 0.5 lb/hp/hr (0.304 kg/kW/hr, 225 US.gal/hp/hr) cruising
- Oil consumption: 0.015 lb/hp/hr (0.09 kg/kW/hr, 7 US.gal/hp/hr) cruising
- Power-to-weight ratio: 0.357 hp/lb (0.587kW/kg)
See also
- Related development
- Franklin 2 series
- Franklin 4 series
- Franklin 6 series
- Franklin 8 series
- Franklin 12 series
- Franklin O-335
- Franklin O-805
- Related lists
Notes
- 1 2 "Franklin, Aircooled Motors, Doman-Marks (US); Franklin Aircraft Engines, WSK-PZL (Poland) Part 2: O-315 through O-805".
- 1 2 Erickson, Jack. "Franklin, Aircooled Motors, Doman-Marks (US);Franklin Aircraft Engines, WSK-PZL (Poland) Part 2: O-315 through O-805".
- ↑ Wilkinson, Paul H. (1945). Aircraft Engines of the world 1945. New York: Paul H. Wilkinson. pp. 94–95.
References
- Wilkinson, Paul H. (1945). Aircraft Engines of the world 1945. New York: Paul H. Wilkinson. pp. 88–89.
- Erickson, Jack. "Franklin, Aircooled Motors, Doman-Marks (US); Franklin Aircraft Engines, WSK-PZL (Poland) Part 1: Introduction and O-110 through O-300".
- Erickson, Jack. "Franklin, Aircooled Motors, Doman-Marks (US);Franklin Aircraft Engines, WSK-PZL (Poland) Part 2: O-315 through O-805".
Further reading
- Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p. 57
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