Mystic in New London County, Connecticut — The American Northeast (New England)
Compound Steam Engine
Compound Steam Engine
From Tugboat Socony 5
Bore: 19”, 40”
Weight: 40,000 pounds
Length: 8’ 9” Width: 6’ 10” Height: 14’
This large steam engine was built in 1927 by the Staten Island Shipbuiding Company in Staten Island, NY. It turned a 10-foot-diameter propeller on the steel tugboat Socony 5, part of a New York Harbor tugboat fleet owned by Standard Oil Company of New York.
Developed about 1870, the two-cylinder engine was a practical power plant for small to medium-sized vessels for almost 80 years until superseded by diesel engines. This example worked with a steam pressure of 160 pounds per square inch. Steam from the boiler first entered the small high-pressure cylinder, driving its piston, and was then exhausted into the large low-pressure cylinder to expand further.
The engine’s horsepower of 850 may seem modest by today’s standards, but this figure is based on a working load output, unlike horsepower calculations for modern internal-combustion engines. This engine has 10 times the horsepower of the Paine compound engine of the Museum’s passenger steamboat Sabino.
Location. 41° 21.571′ N, 71° 57.889′ Click for map. Located in Mystic Seaport. Marker is at or near this postal address: 75 Greenmanville Avenue, Mystic CT 06355, United States of America.
Other nearby markers. At least 8 other markers are within walking distance of this marker. Live Oak Log (a few steps from this marker); Wichmann Semi-Diesel Engine (a few steps from this marker); Lathrop D-90 Diesel Engine (within shouting distance of this marker); Propeller Steamer Sabino (about 300 feet away, measured in a direct line); Harbor Tugboat Kingston II (about 300 feet away); Eastern-Rig Dragger Roann (about 300 feet away); Whaleship Charles W. Morgan (about 300 feet away); Hays & Ros Clark Shiplift (about 300 feet away). Click for a list of all markers in Mystic.
Also see . . . Mystic Seaport, The Museum of America and the Sea. (Submitted on September 15, 2013, by Michael Herrick of Southbury, Connecticut.)
Categories. • Waterways & Vessels •
Credits. This page originally submitted on , by Michael Herrick of Southbury, Connecticut. This page has been viewed 482 times since then and 5 times this year. Photos: 1, 2, 3, 4, 5. submitted on , by Michael Herrick of Southbury, Connecticut. 6. submitted on , by Michael Herrick of Southbury, Connecticut. This page was last revised on June 16, 2016.