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Classic Live Steam of Yesteryear

 
1/3 Horsepower Compound Marine Engine

-Designed by H.J. Coventry-

 

 
 

 
 
 
In 1929, H.J. Coventry designed (and made castings available for) a vertical, stationary marine engine, 1/3rd HP, 2-cylinder, compound style. Its construction was described in The Modelmaker magazine at that time, and castings advertised in same. It was described again to a new audience in the 1950s in The Miniature Locomotive magazine, and again to yet another audience in the 1970s in a series of articles that ran for a time in Live Steam Magazine.

Castings have been unavailable since the 1970s.

The complete set of castings for the "1/3 HP Compound Engine" will be ready in 2022. A preview of the castings can be seen below. The complete set of drawings, as well as Mr. Coventry's construction articles, are available at this time (please see below).


 
 
H.J. Coventry marine engine stationary engine castings live steam
These are the initial castings produced by FRIENDS MODELS in 2022. You'll see the low-pressure and the high-pressure cylinders, the columns, the flywheel, the bedplate, the bearings, the eccentric rods, and the eccentric straps.
 
 
Specifications:

  • 1-1/4" and 2-1/4" bores, x 1-1/2" stroke

  • Compound....exhaust steam from the high pressure cylinder, powers the low-pressure cylinder

  • Slide Valves

  • Stephenson valve gear, reversed via hand wheel with worm gear

  • Develops 1/3 HP at about 600 RPM

  • All parts can be handled on a 9" lathe, and a small bench-top mill or mill/drill

 
 
Click the button at right, to purchase the complete set of drawings, and the construction articles, for the H.J. Coventry "Marine Compound" engine. $140.00, plus $35.00 shipping. 

(For shipping to countries other than the USA, please inquire).

 

 
 
 
HJ Coventry compound marine engine
Mr. Coventry's ORIGINAL marine engine (built 1929), "live and in color".
 
 
HJ Coventry 1/3 horsepower HP marine compound engine live steam castings
A 1970s-era advertisement for the H.J. Coventry 1/3HP Marine Compound engine. This engine was designed in 1929 and has not been produced, or available, since the 1970s.
 
 
H.J. Coventry Baltimore Maryland MD 1/3 horsepower HP marine engine
Another example of the 1/3 Horsepower Compound Marine engine by H.J. Coventry; this one by a different builder and featured in Modeltec Magazine some years ago.
 
 
Classic Live Steam of Yesteryear



Rough Castings                                  Old-Fashioned Drawings & Blueprints
 
 
 
Friends Yankee Shop Models
100 Cummings Center
Suite 159-D
Beverly, MA 01915
 
Contact:
 
1-(978)-922-4400 (Phone, at my business "JFK Clock Repair")
1-(978)-922-4409 (24-hour fax)
info@friendsmodels.com



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