Franklin 6 series

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Franklin 6 series engines
FranklinO335engine1.JPG
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[edit]

Data from:[1][2]

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[edit]

Data from:[1][2]

Specifications (6ACV-403)[edit]

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 cSt) 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

See also[edit]

Related development
Related lists

Notes[edit]

References[edit]

Further reading[edit]

  • Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p. 57