26/02/2026
➤ Cannon Class Destroyer Es**rts and the GM 16-278A Diesel Powerplant
During World War II, naval engineering evolved at an extraordinary pace. Among the most innovative propulsion systems of the war were those installed in the Cannon-class destroyer es**rt. Unlike traditional steam-driven warships, these vessels relied on large two-stroke diesel engines manufactured by the Cleveland Diesel Engine Division of General Motors in Cleveland, Ohio.
These engines—often referred to as the Winton V-type—were the result of years of prewar development. By the time the United States entered the war, later production models had matured into exceptionally reliable machines capable of continuous, high-load operation in harsh maritime environments.
➤ The GM Model 16-278A: The Heart of the Cannon Class
At the center of the Cannon-class propulsion system was the Model 16-278A, a massive V-type diesel engine installed in sets of four aboard ships such as USS Slater (DE-766).
This was not merely a large engine—it was a carefully engineered naval power unit designed for endurance, redundancy, and operational flexibility.
• 16-Cylinder V Configuration
⤷ Two banks of 8 cylinders arranged in a V formation.
⤷ This layout reduced overall engine length while maintaining structural rigidity.
⤷ The V-design improved balance and minimized torsional vibration in marine operation.
• Two-Stroke Operating Cycle
⤷ Unlike modern four-stroke heavy diesels, the 16-278A operated on the two-stroke principle.
⤷ Each piston produced a power stroke every crankshaft revolution.
⤷ This allowed higher power density relative to engine size.
• Rated Output
⤷ 1,600 brake horsepower (bhp) at 750 RPM.
⤷ Low-speed, high-torque characteristics ideal for generator drive applications.
⤷ Designed for sustained, continuous-duty naval service.
• Bore and Stroke Dimensions
⤷ Bore: 8¾ inches
⤷ Stroke: 10½ inches
⤷ The long stroke contributed to high torque production and efficient combustion at moderate rotational speeds.
➤ Two-Stroke Combustion in the 16-278A
The two-stroke diesel principle differs fundamentally from four-stroke systems.
• Air intake and exhaust events occur during piston travel near bottom dead center.
• A mechanically driven blower forces scavenging air into the cylinder.
• Exhaust ports in the liner allow burnt gases to exit.
• Fuel is injected under high pressure directly into compressed air.
Because combustion occurs every revolution, the engine delivers smoother torque output to the generator shaft—critical for stable electrical production.
➤ Air Starting System
Unlike small engines that use electric starters, the 16-278A was air started.
• High-pressure compressed air is admitted into selected cylinders.
• The force of expanding air rotates the crankshaft.
• Once sufficient rotational speed is achieved, fuel injection begins.
This system eliminated dependency on large electrical cranking motors and was highly reliable in combat conditions.
➤ Diesel-Electric Propulsion: A Submarine-Inspired System
The propulsion arrangement in the Cannon class closely resembled that of contemporary diesel-electric submarines.
Instead of directly turning the propeller shafts, the diesel engines powered DC generators. Those generators supplied electricity to propulsion motors connected directly to the ship’s screws.
• Diesel → Generator → Electric Motor → Propeller
⤷ Mechanical energy converted into electrical energy.
⤷ Electrical energy converted back into rotational mechanical energy.
This system provided exceptional control and redundancy.
• Speed regulation was achieved using a rheostat.
⤷ By varying current flow to propulsion motors, shaft speed could be finely controlled.
⤷ No mechanical gear shifting required.
• Electric drive allowed flexible engine placement within the hull.
• Reduced mechanical shock transmission compared to direct-drive steam turbines.
➤ Variants of Destroyer Es**rt Propulsion Systems
Different destroyer es**rt classes used different propulsion configurations, each coded by abbreviation.
➤ GMT – General Motors Tandem Diesel
Used in the Evarts-class destroyer es**rt.
• GM V-12 diesels installed in tandem.
• Engines mechanically coupled together.
• Compact but less flexible than separate generator setups.
➤ DET – Diesel Electric Turbine
Used in the Cannon class.
• Each engine drove its own generator.
• Provided improved redundancy and reliability.
• Longer operational range compared to steam-driven counterparts.
DET ships were slightly slower but ideal for long Atlantic convoy missions.
➤ FMR – Fairbanks-Morse Reduction
Used in the Edsall-class destroyer es**rt.
• Powered by Fairbanks-Morse diesel engines.
• Final drive through reduction gearing.
• Known for opposed-piston engine technology.
➤ TE and TEV – Turbo Electric
Used in the Buckley-class destroyer es**rt and Rudderow-class destroyer es**rt.
• Steam turbines generated electricity.
• Electric propulsion motors turned propellers.
• Faster top speeds.
• Shorter operational range.
➤ WGT – Westinghouse Geared Turbine
Used in the John C. Butler-class destroyer es**rt.
• Geared steam turbine design.
• Direct mechanical reduction gearing.
• Higher speed but greater fuel consumption.
➤ Range vs Speed: Strategic Trade-Off
A critical operational difference existed between diesel-electric and steam-powered es**rts:
• Diesel-electric ships (GMT, DET, FMR)
⤷ Longer cruising range
⤷ Superior fuel economy
⤷ Ideal for Atlantic convoy protection
• Steam-powered ships (TE, TEV, WGT)
⤷ Higher maximum speeds
⤷ Shorter operational range
⤷ Better suited for Pacific fleet operations
This difference influenced deployment strategy throughout World War II.
➤ Reliability Under Wartime Conditions
The Winton/GM engines initially underwent years of refinement before wartime mass production. By the later production runs:
• Lubrication systems were strengthened.
• Blower and scavenging systems improved.
• Injector reliability increased.
• Structural casting defects were minimized.
Reports from naval personnel, including crew members such as MoMM2c George D. McCarthy of USS Hilbert (DE-742), describe the engines as dependable and robust during sustained convoy duty.
➤ Engineering Legacy
The Cannon-class diesel-electric system demonstrated:
• The practicality of large-scale diesel-electric naval propulsion.
• The durability of two-stroke marine diesel engines.
• The strategic importance of fuel-efficient convoy es**rts.
Much of the technical doctrine was documented in Submarine Main Propulsion Systems, NAVPERS 16161 (June 1946) and later influenced postwar marine diesel development.
➤ Final Technical Perspective
The GM 16-278A was not merely an engine—it was part of a complete integrated propulsion philosophy.
Its two-stroke V-16 architecture delivered:
• High torque at moderate RPM
• Compact but powerful design
• Continuous-duty reliability
• Efficient long-range naval operation
Combined with diesel-electric transmission, it allowed the Cannon-class destroyer es**rts to become workhorses of Atlantic convoy protection—quietly, efficiently, and dependably guarding supply lines during one of history’s most demanding naval conflicts.
