High-domed Mercury Mark 78 (left) is the biggest production outboard on the market. Cost of the 7½-horse diesel will be about 25% above that of a comparable gas engine, or about $325. More powerful engines, to be developed simply by adding extra cylinders through in-line construction, are planned for the future. The first production model will be an engine rated at 7½ hp. Heretofore, the diesel has been too heavy and cumbersome to be suited to outboard production, but these innovations give twice the power in half the space. More, in this unique engine, the cylinder cleans itself of exhaust gases (see left) without the valves and scavenging pumps demanded in conventional diesel design. And in the American MARC, they will also be getting a design in which the fuel is precombusted, saving the bulk of diesel combustion chambers, and a space-saving, weight-saving, two-pistons-in-one cylinder. In the American MARC diesel the outboard boatman will be getting an engine that has no carburetor, no sparkplugs and no magneto. But the most remarkable engineering advance of the past year, perhaps of the past 50 years, is the development of the first diesel-powered outboard engine, a two-cycle, self-scavenging, opposed-piston motor, which will soon be offered to the public by American M.A.R.C. Preferably do the job right in the first place, and add a proper piece of metal complete with the retaining lip.The American penchant for going places fast and comfortably is something outboard engine and boat manufacturers have been quick to recognize. I learnt one main thing, and that is that if you are going to pad out a transom temporarily, at least tack the scrap wood on with a couple of screws so the loose piece can't fall off. I had a good look at a standard outboard mount, and (then!) noticed that the metal cover has a 1/4" inch lip at the top, so placed that if the pad screws work loose, thay will catch under the lip, and the motor won't fall off. He was as good as his word, and the motor is now fine. My local mechanic said cheerfuly, yes, we get a lot like this, see you in two weeks. I had a safety line, so hauled it in, and rowed home. Three hours later, after a good fishing session, we were running for home when the pad worked loose, and the motor jumped off the stern and gracefully sunk, and stopped. It did not fit, (outboards expect at least an inch thichness or so) of course, so I padded the too thin transom with a bit of scrap, and we set off. Two of us wanted to go fishing last spring, and I hung a 30 year old 7.5 h.p Evinrude Yacht-twin off the transom of my Whitehall. A cautionary tale, and I am still feeling a bit stupid. To advertise, take a look at WoodenBoat Advertising, or use your Google Adwords account if you want to advertise on the Forum. Selling/self promotion postings are verboten on the Forum. No need to register unless you would like to participate, although some images will only show if you are registered/logged-in.īefore you can post: click the red register link or the register tab, above, right. You'll find answers to the frequently asked questions as well as basic rules. To get WoodenBoat delivered to your door or computer, mobile device of choice, etc, click WB Subscriptions.Ĭheck out the FAQ. Transom protector for outboard mounting wood runabout free#The Forum is a free service, and much like the "free" content on Public Radio, we hope you will support WoodenBoat by subscribing to this fabulous magazine. The WoodenBoat Forum is sponsored by WoodenBoat Publications, publisher of WoodenBoat magazine. Tools / Materials / Techniques / Products.
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