Marine Engine Collection of Mystic Seaport

Herreshoff Marine Manufacturing Co., Bristol, RI ?

Engine Builder:
Model: ?
Make: Herreshoff Marine Manufacturing Co., Bristol, RI
Inboard/Outboard: Inboard
Engine Type: Steam -Triple Expansion (3 Cyl)
Production Date: 1917
Engine Design: Other
Overall Condition: Good
Rebuilt/Restored: Untouched
Horsepower: 350 (Remarks)
Cylinders: 3
Bore: 6",10"&16"
Stoke: 9"

Remarks: Purchased by MSM from D. Cameron Peck on March 30, 1953. At the time of transfer, this engine's horse power was estimated at 350. Subsequent calculations performed at MSM by a Mr. Matthews determined the Indicated Horse Power as 116.9, and the Brake Horse Power as 103, assuming an efficiency of .88. Mr. Matthews believed this to be "reasonable compared to other steam engines of like size." Design is: Three cylinder, Triple expansion steam with exposed cranks; high, intermediate and low pressure cylinders in tandem; drip wick oil supply on eccentric straps, gravity feed oil supply on crank bearings, steel piston and eccentric rods; relief valves on each cylinder; piston valves on steam parts. Approximate weight one ton. This is the starboard engine from the twin screw Navette, built 1916/17 by Herreshoff for J. P. Morgan. (Navette means "Shuttle" in French.) Calculations made on Oct 6, 1989 by "Mathews" at Mystic Seaport rate the horsepower at 103, rather than the 350 indicated above.


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