![sterndrive vs inboard sterndrive vs inboard](http://southwestmarinerepair.com/yahoo_site_admin/assets/images/Sterndrive-Inboard-500x205.6774937_std.jpg)
![sterndrive vs inboard sterndrive vs inboard](https://cdn.crowleymarine.com/assets/images/c_sterndrive_build.jpeg)
To give you an example, our boat, which has a 350Hp diesel on an outdrive and an enclosed centere wheelhouse is quieter inside at 30kts than my car is on the motorway. Inboard powereither direct drive or V-driveis less complex and requires less service than a sterndrive, and is also less prone to corrosion in saltwater. Indeed if you have a bow thruster a bit of practice will allow you to move a single engined OJ equipped boat more or less directly sideways with minimal fore and aft movementĢ) The ability to trim the leg means that you can get access to a fouled prop without swimming.ģ) The geometry of the installation means that the engine is under the stern-deck and is thus easy to insulate accousticaly from the wheelhouse/accommodation, whereas a shaft boat typically has the engine underneath a centre wheelhouse - which pretty much guarantees high noise levels. These factors combine to imply that most boats with OJ's qre quite "wandery" at displacement speed - that is they require constant attention to maintain a respectable course and larger steering inputs than you would expect to restore direction once lost.ġ) You have vectored thrust at the stern which means that steering at berthing speeds is much better than a single engined shaft boat (which usually uses prop-walk to achieve the same effect - less well and only in one direction). The pseudo rudder provided by the leg is quite small so steering while moving with the power off, while not absent, is further restricted. Typically, inboard motors sit towards the middle of a boats hull however, boat owners mount their outboard motors on its transom, keeping the engine and drive. More of the routine maintenance items are below the waterline and can only be accessed during liftout.Ģ) The boat steers by turning the outdrive and so max steering angle is usually quite small - this doesn't matter at 30kts but certainly does at 8. Its watertight integrity is determined by one or more rubber belows which prudence dictates should be replaced well before any possibility of failure. operation in reverse - SDs are very inefficent in reverse (exhaust gas is. Two reasons: Placement - stearn drives are farther from the center of the boat. twin stern drive setups are much less manuverable than twin inboards. For this reason, sterndrives are also referred to as inboard/. A single sterndrive is more manuverable than a single inboard, but a most. The outdrive is a complicated bit of kit which has to turn many HP through 90 degrees twice. A sterndrive is an arrangement that combines the elements of inboard and outboard systems. However, I can see some possible utility in them for displacement use, so here is my list of pos and neg pointsġ) Maintenance costs are way higher than shafts. Pod drive systems feature a steerable prop and are a hybrid of an inboard and a sterndrive, but pods require twin engines and are available only for larger boats. Click to expand.An outdrive is an odd choice for a displacementboat, because their real payoff comes with the ability to trim the drive angle of the leg. However, the sterndrive can be trimmed, which results in superior speed and efficiency on small to mid-size boats.