Lycoming O-235 Explained

The Lycoming O-235 is a family of four-cylinder, air-cooled, horizontally opposed, piston aircraft engines that produce 100to, derived from the earlier O-233 engine.[1] [2]

Well-known designs that use versions of the O-235 included the Cessna 152, Grumman American AA-1 series, Beechcraft Model 77 Skipper, Piper PA-38 Tomahawk, American Champion Citabria, Piper Clipper, and the Piper PA-22-108 Colt.

Development

The engines are all carburetor-equipped, feature dual magneto ignition and have a displacement of 233 cubic inches (3.82 L). The first O-235 model was certified on 11 February 1942.

The O-235 was developed into the lighter-weight Lycoming IO-233 engine for light sport aircraft.[3]

Variants

O-235-C1
  • Power 1150NaN0 at 2800 rpm, dry weight 2460NaN0 Provision for dual pump drives, tractor and pusher installation.
    O-235-C1A
  • Power 1000NaN0 at 2450 rpm, dry weight 2360NaN0 Similar to O-235-C1 except ignition timing, lower rpm and power. Optional 2 position or automatic propeller governor drive.
    O-235-C1B
  • Power 1150NaN0 at 2800 rpm, dry weight 2450NaN0 Similar to O-235-C1 except with retard breaker magnetos.
    O-235-C1C
  • Power 1080NaN0 at 2600 rpm, dry weight 2430NaN0 Similar to O-235-C1 except with Slick magnetos.
    O-235-C2A
  • Power 1150NaN0 at 2800 rpm, dry weight 2460NaN0 Similar to O-235-C1 except with a type 1 propeller flange.
    O-235-C2B
  • Power 1150NaN0 at 2800 rpm, dry weight 2470NaN0 Similar to O-235-C2A but with two S-1200 series magnetos.
    O-235-C2C
  • Power 1080NaN0 at 2600 rpm, alternate rated maximum continuous power rating of 100 hp at 2400 rpm, dry weight 2440NaN0 Similar to O-235-C2B except with Slick magnetos and shielded ignition harness.
    O-235-E1
  • Power 1150NaN0 at 2800 rpm, dry weight 2500NaN0 Similar to O-235-C1 except crankcase and crankshaft supply pressurized oil to a constant speed propeller. Accessory case changed to accommodate a standard propeller governor drive.
    O-235-E1B
  • Power 1150NaN0 at 2800 rpm, dry weight 2490NaN0 Similar to O-235-E1 except for S4LN-200 series retarded breaker magnetos.
    O-235-E2A
  • Power 1150NaN0 at 2800 rpm, dry weight 2500NaN0 Similar to O-235-E1 except Type 1 propeller flange.
    O-235-E2B
  • Power 1150NaN0 at 2800 rpm, dry weight 2510NaN0 Similar to O-235-E2A except incorporates S-1200 series magnetos.
    O-235-F1
  • Power 1250NaN0 at 2800 rpm, dry weight 2500NaN0 Similar to O-235-C1 except compression ratio, fuel grade and rating.
    O-235-F1B
  • Power 1250NaN0 at 2800 rpm, dry weight 2490NaN0 Similar to O-235-F1 except retarded breaker magnetos.
    O-235-F2A
  • Power 1250NaN0 at 2800 rpm, dry weight 2500NaN0 Similar to O-235-F1 except a Type 1 propeller flange.
    O-235-F2B
  • Power 1250NaN0 at 2800 rpm, dry weight 2510NaN0 Similar to O-235-F2A but with S-1200 series magnetos.
    O-235-G1
  • Power 1250NaN0 at 2800 rpm, dry weight 2530NaN0 Similar to O-235-F1 except provisions for using constant speed propeller.
    O-235-G1B
  • Power 1250NaN0 at 2800 rpm, dry weight 2520NaN0 Similar to O-235-G1 except has retarded breaker magnetos.
    O-235-G2A
  • Power 1250NaN0 at 2800 rpm, dry weight 2530NaN0 Similar to O-235-G1 except a Type 1 propeller flange.
    O-235-G2B
  • Power 1250NaN0 at 2800 rpm, dry weight 2540NaN0 Similar to O-235-G2A except S-1200 series magnetos.
    O-235-H2C
  • Power 1080NaN0 at 2600 rpm, alternate rated maximum continuous power rating of 100 hp at 2400 rpm, dry weight 2430NaN0 Similar to O-235-C2C except Type 1 dynafocal mounting.
    O-235-J2A
  • Power 1250NaN0 at 2800 rpm, dry weight 2520NaN0 Similar to O-235-J2B except magnetos.
    O-235-J2B
  • Power 1250NaN0 at 2800 rpm, dry weight 2530NaN0 Similar to O-235-F2B except Type 1 dynafocal mounting.
    O-235-K2A
  • Power 1180NaN0 at 2800 rpm, dry weight 2520NaN0 Similar to O-235-F2A except ignition timing, lower power and reduced compression ratio.
    O-235-K2B
  • Power 1180NaN0 at 2800 rpm, dry weight 2530NaN0 Similar to O-235-F2B except ignition timing, lower power and reduced compression ratio.
    O-235-K2C
  • Power 1150NaN0 at 2700 rpm, dry weight 2480NaN0 Similar to O-235-K2A except Slick magnetos.
    O-235-L2A
  • Power 1180NaN0 at 2800 rpm, alternate ratings of 1150NaN0 at 2700 rpm, 1120NaN0 at 2600 rpm, 1100NaN0 at 2550 rpm and 1050NaN0 at 2400 rpm, dry weight 2520NaN0 Similar to O-235-J2A except ignition timing, lower power and reduced compression ratio.
    O-235-L2C
  • Power 1150NaN0 at 2700 rpm, alternate ratings of 1150NaN0 at 2700 rpm, 1120NaN0 at 2600 rpm, 1100NaN0 at 2550 rpm and 1050NaN0 at 2400 rpm, dry weight 2490NaN0 Similar to O-235-L2A except Slick magnetos and lower maximum continuous rating.
    O-235-M1
  • Power 1180NaN0 at 2800 rpm, alternate ratings of 1150NaN0 at 2700 rpm, 1120NaN0 at 2600 rpm, 1100NaN0 at 2550 rpm and 1050NaN0 at 2400 rpm, dry weight 2550NaN0 Similar to -L2A except provision for controllable propeller and has AS-127 Type 2 propeller flange.
    O-235-M2C
  • Power 1180NaN0 at 2800 rpm, alternate ratings of 1150NaN0 at 2700 rpm, 1120NaN0 at 2600 rpm, 1100NaN0 at 2550 rpm and 1050NaN0 at 2400 rpm, dry weight 2520NaN0 Similar to O-235-M1 except Slick 4200 series magnetos and Type 1 propeller flange.
    O-235-M3C
  • Power 1180NaN0 at 2800 rpm, alternate ratings of 1150NaN0 at 2700 rpm, 1120NaN0 at 2600 rpm, 1100NaN0 at 2550 rpm and 1050NaN0 at 2400 rpm, dry weight 2520NaN0 Similar to O-235-M1 except Slick 4200 series magnetos.
    O-235-N2A
  • Power 1160NaN0 at 2800 rpm, alternate ratings of 1130NaN0 at 2700 rpm, 1100NaN0 at 2600 rpm, 1080NaN0 at 2550 rpm and 1030NaN0 at 2400 rpm, dry weight 2520NaN0 Similar to O-235-L2A except reduced compression ratio and reduced power ratings.
    O-235-N2C
  • Power 1160NaN0 at 2800 rpm, alternate ratings of 1130NaN0 at 2700 rpm, 1100NaN0 at 2600 rpm, 1080NaN0 at 2550 rpm and 1030NaN0 at 2400 rpm, dry weight 2490NaN0 Similar to O-235-L2C except reduced compression ratio and reduced power ratings.
    O-235-P1
  • Power 1160NaN0 at 2800 rpm, alternate ratings of 1130NaN0 at 2700 rpm, 1100NaN0 at 2600 rpm, 1080NaN0 at 2550 rpm and 1030NaN0 at 2400 rpm, dry weight 2550NaN0 Similar to O-235-M1 except reduced compression ratio and reduced power ratings.
    O-235-P2A
  • Power 1160NaN0 at 2800 rpm, alternate ratings of 1130NaN0 at 2700 rpm, 1100NaN0 at 2600 rpm, 1080NaN0 at 2550 rpm and 1030NaN0 at 2400 rpm, dry weight 2550NaN0 Similar to O-235-P1 except a Type 1 propeller flange.
    O-235-P2C
  • Power 1160NaN0 at 2800 rpm, alternate ratings of 1130NaN0 at 2700 rpm, 1100NaN0 at 2600 rpm, 1080NaN0 at 2550 rpm and 1030NaN0 at 2400 rpm, dry weight 2520NaN0 Similar to O-235-M2 except reduced compression ratio and reduced power ratings.
    O-235-P3C
  • Power 1160NaN0 at 2800 rpm, alternate ratings of 1130NaN0 at 2700 rpm, 1100NaN0 at 2600 rpm, 1080NaN0 at 2550 rpm and 1030NaN0 at 2400 rpm, dry weight 2520NaN0 Similar to O-235-M3C except reduced compression ratio and reduced power ratings.

    External links

    Notes and References

    1. Textron Lycoming: Operator's Manual, Textron Lycoming Aircraft Engines, Series O-235 & O-290, 4th Edition January 1988, Pages 2-1 & 2-4, Stock # 60297-9, Textron Lycoming.
    2. Web site: TYPE CERTIFICATE DATA SHEET NO. E-223. PDF. 2008-11-30. Federal Aviation Administration. Federal Aviation Administration. December 2003.
    3. Web site: Lycoming Engines Launches the IO-233-LSA. 2009-04-03. Lycoming Engines. Lycoming Engines. July 2008. dead. https://web.archive.org/web/20101126071441/http://lycoming.com/news-and-events/press-releases/release-07-28-08b.html. 2010-11-26.

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