1/4/2024 0 Comments Inboard propellerBut with inboards typically you'll need to have the propeller(s) pulled and sent to a good prop shop so that they can work their "magic" on your existing prop to repair it or determine that you need another. Usually the best way to deal with a propeller issue with an outboard is to get a new prop if it's damaged or, if you're not sure you nave the correct prop, try on different ones, with the recommendation of a qualified dealer, until you've got it right. Either of these could cause vibration or undue stress and ultimately damage your transmission, cutlass bearing and other components. Another would be having the blades out of alignment, as would occur if you hit something. One of these is dings on one or more blades. There are other factors that can adversely affect the performance of your propeller. While most of these comments are geared to outboard engines, some also pertain to inboards. "I've talked to mechanics that think using the wrong prop is the single greatest cause of premature engine failure," says Bob. Our Manager of Technical Services Bob Adriance would like to remind you that the wrong prop can wreck an engine. range, it's operating under an extremely loaded condition and premature failure is highly likely. If your engine is not able to reach this r.p.m. fall within the range specified by your engine manufacturer. It is imperative, however, that the WOT r.p.m. Cruisers and houseboats need more performance at displacement speeds, and should use a prop with a lower pitch to achieve low-end power. Ski boats need more top end speed, and should choose a prop with a higher pitch. In all likelihood, more than one propeller will be suitable for your boat and motor combination, depending on your usage. It may be advisable in these circumstances to have multiple propellers, each to accommodate different boating activities. However, you may not be satisfied with your boat's skiing performance or trolling speed. falls within the recommended range of the engine manufacturer, you have a propeller that is suited to your boat with respect to r.p.m. For most twin engine installations it is necessary to increase pitch by 4". These recommendations apply to single engine installations only. If you cannot reach maximum r.p.m., then pitch should be decreased. The cupped propeller of the same pitch and diameter will typically reduce your r.p.m. Also, switching from an uncupped to a cupped propeller will reduce your r.p.m (see "Cupping" paragraph below). Increasing the pitch increment by 2" will result in approximately a 200-400 r.p.m. If the engine over-revs beyond the maximum recommended r.p.m., you may need to increase the pitch of the propeller. of the engine, reduce the throttle setting. If during this test, you begin to exceed the maximum rated r.p.m. Using your existing propeller, determine your maximum obtainable r.p.m. where the maximum horsepower is produced, with ideal engine loading. The correct propeller will prevent the engine from over-revving, yet allow it to reach the minimum r.p.m. The goal in propeller selection is to determine what style and size will maximize your boat's performance, while allowing your engine to operate in the recommended r.p.m. You can find this in your operator's manual, expressed in terms of a certain horsepower at a certain r.p.m. The proper propeller size for your boat and engine combination is based in part on the wide open throttle (WOT) operating range for your particular engine.
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