From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Publication page detailing new marine engines and related products for the 1940 model year.
| Identifier | ExFiles\Box 133\3\ scan0131 | |
| Date | 1st January 1940 | |
| The Model IM Superior, shown by its builder, the National Supply Co., is a Diesel engine manufactured with 5, 6 or 8 cylinders. It is 8½” bore and 10½” stroke and is rated 195, 235 and 310 hp. at 700 r.p.m. National Supply Adds Two New Diesels The National Supply Company, builders of the Superior line which comprises 33 models of Diesel engines ranging from 25 to 1000 hp., is introducing two entirely new engines at the Show this year. Both are of the 4-cycle, moderate speed, heavy duty type and can be furnished for marine, stationary or generator set service. The most interesting of these to yachtsmen is the MRD-4, a 4-cylinder engine with 5½” bore and 7” stroke which is rated 90 hp. at 1200 r.p.m. This engine practically duplicates the design of the well-known 6- and 8-cylinder Model D Superiors of the same cylinder dimensions which develop 170 and 230 hp., respectively, at 1500 r.p.m. The new MRD-4 has a simple and efficient fresh water cooling system which is exhibited on this and other Superior models. This system comprises a tubular heat exchanger, accessibly mounted on the exhaust manifold, and a large capacity sea water pump mounted on the reverse gear housing and driven directly by one of the timing gears. The cost of this equipment is nominal and it can be installed on all previous Models A or D, including those in service. The other new engine, IM, has a bore of 8½” and stroke of 10½” and can be had with five, six, or eight cylinders developing 195, 235, and 310 hp., respectively, at 700 r.p.m. Compressed air is used for starting and all models are direct reversible. One of the most interesting features in the Superior exhibit is a cutaway model of the MRA-6. This shows the interior construction and the manner in which the details differ from those of a gasoline engine. The MRA-6 has a 4½” bore and a 5¾” stroke and develops 100 hp. at 1600 r.p.m. The three remaining engines exhibited by Superior are: MA-8, 4½ by 5¾”, 8 cylinders, 150 hp. at 1800 r.p.m. MRD-6, 5½ by 7”, 6 cylinders, 170 hp. at 1500 r.p.m. GA-2, 4½ by 5¾”, 2 cylinders, 10 kw. marine type Diesel generator set. manufacturers in the marine engine field, has by no means gone “high speed,” one of the engines featured this year is the LH{Mr Haworth}-D6 De Luxe model which is rated at 64 hp. at 2200 r.p.m. This engine weighs about 850 pounds and includes an oil cooler and filter, built-in tachometer drive, fuel pump, oil sump pump, lifting ring and instrument panel. The crank shaft of the LH{Mr Haworth}-D6 is of special S.A.E. steel with surface hardened bearings, running in cadmium nickel alloy bearings. The cylinder blocks are cast from electric furnace molybdenum alloy iron and the pistons are of aluminum. Four completely new engines have joined the Lathrop line for the coming year. One of these is the 6-cylinder Engineers’ model of 115 hp., of which several have been built as custom jobs during recent years. From now on, the “six,” like the four-cylinder Engineers’ models, will be standardized. Another new addition to the regular Lathrop line is a 6-cylinder Diesel known as the Type D-80, rated conservatively at 80 hp. at 800 r.p.m. Lathrop Exhibits Nine Models Of the thirty or more models and sizes of engines manufactured by the Lathrop Engine Company, of Mystic, Conn., nine are on exhibition at this year's Show. They range in size from the large 6-cylinder Type 175 Mystic Model engine with a bore of 5¾” and a stroke of 6½”, down to the Type 4, single-cylinder, 2-cycle engine. Although Lathrop, one of the oldest Neptune Shows Improvements Among the many improvements announced for the Neptune line of outboard motors manufactured by the Muncie Gear Works, of Muncie, Ind., is the adoption of “neoprene lip-sea packing, a du Pont product designed to provide an absolutely oiltight seal which does not impose drag on the revolving shafts. A new method of preparing cylinder walls is also being used on all 1940 models of the Neptune while carburetion, balance, silencing and other matters have received the attention of the company’s designers. Neptune models comprise the 1.2 hp. Junior single, the 2 hp. single, the 4 hp. Junior twin, the 6 hp. and 9½ hp. alternate-firing twins, and the 16 hp. Master twin — the last being of erected with a new type of Eisemann fly wheel magneto and an improved Tillotson carburetor. Jeffery’s Marine Glues L. W. Ferdinand & Co., Inc., is down again from Boston with its Jeffery’s marine glues, Ferdico cements, seam filler, canoe glue, aviation cements and the like. Like their manufacturer, these products stay put — and that’s a good attribute to have when in remote parts of the world everything seems to be getting unstuck. (Image caption, bottom left) The Eclipse 5 hp. air-cooled Twin, an outboard built by the Marine Department of Bendix Aviation Corporation, weighs 41 pounds. | ||