Engines · piston (reciprocating) · data as of October 5, 2026

Franklin 6V 350 series

134 aircraft on the U.S. register carry a Franklin 6V 350 series engine, rated at about 235 horsepower. The Maule M-4 is the model most often fitted with it (47 aircraft). The aircraft carrying it were built between 1947 and 1974.

The FAA records engines by code, usually at the level of a series ("O-320 series") rather than the exact variant; this page gathers every FAA code that reads as Franklin 6V 350 series. FAA spelling: 6V 350 SERIES.

Fitted to model families

Maule M-447S.O.C.A.T.A. MS89419Siai-Marchetti S.205/22R18Bell 4712Cessna 172 Skyhawk10Maule M-58Cessna 175 Skylark8Hiller UH-127Bell-Carson 471Bell-K-Copter 47G1Bellanca 141Piper PA-23 Apache and Aztec1

Maule M-4 · S.O.C.A.T.A. MS894 · Siai-Marchetti S.205/22R · Bell 47 · Cessna 172 Skyhawk · Maule M-5 · Cessna 175 Skylark · Hiller UH-12 · Bell-Carson 47 · Bell-K-Copter 47G

Where they are owner's state

Texas13California13Alaska8Minnesota7Florida7Washington5North Carolina5Montana5Idaho5Georgia5

Kind of aircraft

Piston singles112 (84%)Helicopters21 (16%)Piston twins1 (0.7%)

When the aircraft were built by decade

Connections how this engine series links to the rest of the register

Fitted to

Maule M-4 47 with this engine series
S.O.C.A.T.A. MS894 19 with this engine series
Siai-Marchetti S.205/22R 18 with this engine series
Bell 47 12 with this engine series
Cessna 172 Skyhawk 10 with this engine series
Maule M-5 8 with this engine series
Cessna 175 Skylark 8 with this engine series
Hiller UH-12 7 with this engine series

Where they are

Texas 13 of these aircraft
California 13 of these aircraft
Alaska 8 of these aircraft
Minnesota 7 of these aircraft
Florida 7 of these aircraft

Biggest operators

Valiant Air Command INC 1 of these aircraft
Strategic Aircraft Management LLC 1 of these aircraft

Analytics

These connections as data: /graph/engine/franklin-6v-350-series.json · about the eFlight graph.

Aircraft newest certificates first · 134

Tail no.	Maker and model	Group	Owner and base	Certificate	Registered	Status
N7688M	Cessna 175	Fixed-wing, single engine	Co-owned owner California	Standard	2011-08-29	Valid
N62007	Maule M-5-220C	Fixed-wing, single engine	Co-owned owner Louisiana	Standard	2011-06-23	Valid
N7905T	Cessna 175A	Fixed-wing, single engine	Individual owner Wyoming	Standard	2010-09-20	Valid
N43BF	S.O.C.A.T.A. MS894A	Fixed-wing, single engine	White Cloud Air LLC Bliss, Idaho	Standard	2010-04-01	Valid
N88KW	Cessna 172G	Fixed-wing, single engine	Individual owner Louisiana	Standard	2009-09-01	Valid
N946W	Siai-Marchetti S.205/22R	Fixed-wing, single engine	Bettylou INC Tomball, Texas	Standard	2009-08-04	Valid
N40331	Maule M-4-220C	Fixed-wing, single engine	Co-owned owner Oklahoma	Standard	2008-07-23	Valid
N921B	Bell 47G	Rotorcraft	Individual owner Illinois	Restricted	2008-01-08	Valid
N970WA	Siai-Marchetti S.205/22R	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2007-11-05	Valid
N1X	Cessna 172F	Fixed-wing, single engine	Individual owner Pennsylvania	Standard	2007-10-30	Valid
N40342	Maule M-4-220C	Fixed-wing, single engine	Individual owner Indiana	Standard	2007-06-29	Valid
N3823S	Cessna 172E	Fixed-wing, single engine	Individual owner Washington	Standard	2007-01-05	Valid
N6JN	Maule M-4-220C	Fixed-wing, single engine	Individual owner Connecticut	Standard	2006-07-17	Valid
N40333	Maule M-4-220C	Fixed-wing, single engine	Individual owner Texas	Standard	2006-06-02	Valid
N40647	Maule M-4-220C	Fixed-wing, single engine	Individual owner Arizona	Standard	2005-06-22	Valid
N40646	Maule M-4-220C	Fixed-wing, single engine	Individual owner Idaho	Standard	2004-04-30	Valid
N12CJ	Siai-Marchetti S.205/22R	Fixed-wing, single engine	Perskys Air Service INC Lapine, Alabama	Standard	2003-12-06	Valid
N40674	Maule M-4-210C	Fixed-wing, single engine	Individual owner Ohio	None on file	2003-10-02	Valid
N7949T	Cessna 175A	Fixed-wing, single engine	Individual owner Ohio	Standard	2003-03-18	Valid
N733W	Siai-Marchetti S.205/22R	Fixed-wing, single engine	Co-owned owner California	Experimental	2002-03-19	Valid
N2049U	Maule M-4-220C	Fixed-wing, single engine	Individual owner Minnesota	Standard	2002-02-05	Valid
N65BF	S.O.C.A.T.A. MS894A	Fixed-wing, single engine	Co-owned owner Oregon	Standard	2000-11-29	Valid
N60BF	S.O.C.A.T.A. MS894A	Fixed-wing, single engine	Individual owner New Mexico	Standard	2000-05-04	Valid
N147DP	Bell 47G	Rotorcraft	Individual owner Florida	Standard	1997-01-16	Valid
N23R	Siai-Marchetti S.205/22R	Fixed-wing, single engine	Individual owner Texas	Standard	1993-08-20	Valid
N85TH	S.O.C.A.T.A. MS894A	Fixed-wing, single engine	Individual owner North Carolina	Standard	1991-08-06	Valid
N4785C	Hiller UH-12B	Rotorcraft	Individual owner Arizona	Multiple	1990-08-14	Valid
N10175	Bell 47G	Rotorcraft	Individual owner Alabama	Experimental	1989-08-08	Valid
N69BF	S.O.C.A.T.A. MS894A	Fixed-wing, single engine	Individual owner Washington	Standard	1989-04-19	Valid
N4704W	S.O.C.A.T.A. MS894A	Fixed-wing, single engine	Romrog INC Clarksburg, West Virginia	Standard	1989-02-21	Valid
N9738Z	Bell 47D1G	Rotorcraft	Individual owner Pennsylvania	Restricted	1987-01-12	Valid
N617X	Bell-Carson 47G	Rotorcraft	Individual owner Texas	Multiple	1979-07-24	Valid
N8438U	Cessna 172F	Fixed-wing, single engine	Individual owner New York	Standard	1975-01-30	Valid
N40326	Maule M-4-220C	Fixed-wing, single engine	Individual owner Maine	Standard		Pending

Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 5, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.