Mystic in New London County, Connecticut — The American Northeast (New England)
Wichmann Semi-Diesel Engine
Horsepower: 83 @ 250 RPM
Torque: 1,747 foot pounds @ 250 RPM
Bore: 12 5/8”
Stroke: 12 5/8”
Weight: approximately 6,000 pounds
Type: Two-cycle, naturally aspirated, reed valve induction, dry sump, Bosch-type injection using hole nozzles
This engine was built by the Wichmann engine company in Bergen, Norway, during the 1930s. it is typical of many large engines built for recreational and commercial uses in Europe and America after Rudolph Diesel perfected the high-compression crude oil marine engine about 1910. Crude oil is not volatile and dangerously explosive like gasoline, but it requires high pressure to combust and a heavy engine to withstand the pressure. Semi-diesel means that the engine is initially fired by a heat source – either hot tubes or glow plugs – rather than by the heat generated from the compression alone, as in a true diesel.
Compare this engine to the large steam engine on your left. Diesel engines have several advantages over steam. Smaller, lighter, and easier to maintain than a steam engine, they are started and shut down more quickly and require fewer crew to operate. Diesels are safer and more economical than comparale gasoline engines as well. That is why most vessels today from supertankers
Although it has low horsepower, the engine’s torque provides efficient propulsion with a propeller four to six feet in diameter. One of the engine’s most interesting features is its direct connection to a controllable-pitch propeller. This provided for reverse by changing the pitch of the propeller rather than reversing the direction of rotation. The pitch (angle) of the blades was changed by a push rod in the hollow propeller shaft.
Mystic Seaport acquired this engine in 1992, but its poor mechanical condition called for an extensive restoration. Museum volunteers devoted 3,300 hours over two years, dismantling the entire engine. They manufactured numeous parts, using the originals as patterns, and restored the engine to excellent working condition.
Location. 41° 21.559′ N, 71° 57.896′ W. Marker is in Mystic, Connecticut, in New London County. Marker can be reached from the intersection of Greenmanville Avenue (Connecticut Route 27) and Bruggeman Place, on the right when traveling south. Touch 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. Lathrop D-90 Diesel Engine (here, next to this marker); Compound Steam Engine (a few steps from this marker); Live Oak Log (within shouting distance of this marker); Hays & Ros Clark Shiplift (about 300 feet away, measured in a direct line); Whaleship Charles W. Morgan (about 300 feet away); Propeller Steamer Sabino (about 400 feet away); Harbor Tugboat Kingston II (about 400 feet away); Eastern-Rig Dragger Roann (about 400 feet away). Touch for a list and map of all markers in Mystic.
Also see . . .
1. Mystic Seaport, The Museum of America and the Sea. (Submitted on September 15, 2013, by Michael Herrick of Southbury, Connecticut.)
2. Wichmann Diesel on Wikipedia. (Submitted on September 15, 2013, by Michael Herrick of Southbury, Connecticut.)
Categories. • Waterways & Vessels •
Credits. This page was last revised on June 16, 2016. This page originally submitted on September 15, 2013, by Michael Herrick of Southbury, Connecticut. This page has been viewed 494 times since then. Photos: 1, 2, 3, 4. submitted on September 15, 2013, by Michael Herrick of Southbury, Connecticut.