Little rock inboard propeller12/9/2023 And walking around a boat yard, one often finds the larger nut is on the shaft against the back of the propeller hub, with the half nut outboard of it. In the industrial world this led to the development of the jam nut, which found its way into the marine industry.Ī common setup on boats uses two nuts, one thick nut and a one half as thick. Great trip but I lost both passenger foot pegs from the unrelenting vibration. Remember when every new car required a break-in period? Fifty years ago, I rode my Triumph Bonneville motorcycle up to Canada and around Quebec Province. Out of balance or misaligned parts often caused vibration that taxed the longevity and performance of fasteners and fittings. Henry Ford was machining components on his assembly lines while the rest of the world still assembled cars by hand.īack then, the world lacked the technology to provide the tolerance precision we now take for granted. During the industrial age, companies developed complex machinery to power all sorts of shafts and belts and pulleys to manufacture products for a developing world. Using two nuts to secure the propeller, much like the invention of the cutless bearing, goes back in history and has no direct ties to the marine industry. No matter if the boat is a sailboat or powerboat, twin engine or single, it a common practice, although some propellers are secured with single nuts and split pins, or more elaborate fittings that incorporate a shaft zinc. What am I talking about? It is the use of two different-sized nuts to hold a propeller on a propeller shaft. “Interference fit” is not a term that resonates with your average boat owner or yard worker. We wrote about this issue years ago, but I always suspected the writer was a bit too technical in his explanation for general understanding. I walked past dozens of boats on jack stands, and nine out of ten boats had it wrong. I see it every spring, as bottoms get painted, zincs replaced, and boats readied for commissioning and launch. A boatyard walkabout prior to the lockdown reminded me that some things always seem to be done wrong.
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