![]() While sterndrives are faster and more fuel-efficient, a V-drive can swing a bigger wheel, and you’re more likely to find a replacement prop when far from home. Ultimately, V-drive systems offer more space amidships than a conventional inboard and require less maintenance and service than sterndrive systems. Inboard running gear components tend to be fairly universal. Also, if you’re cruising to a remote destination and bang up a wheel, it’s easier to find a replacement prop for an inboard versus a specialized prop or propset for a sterndrive or pod drive. With a V-drive, you’re not as limited, and this can be an advantage if, for example, you want to bump up the prop diameter to help improve low-speed handling. While a sterndrive offers better performance, the anti-ventilation plate limits its propeller diameter. Also, a sterndrive’s angle of thrust is virtually horizontal, further increasing efficiency over the 7- to 12-degree down angle of an inboard’s prop shaft. Why? As we proved in our comparison “To V or Not to V”, inboard running gear generates a lot of drag, reducing speed and miles per gallon versus a sterndrive. ![]() Yet, all other things being equal, a sterndrive is faster and more fuel-efficient. Both are quite hard to maintain because their encased engine and some parts are hard to reach. So do offshore anglers, because this alley makes it easier for fish to find and attack trolling lures and baits.Ī V-drive is more efficient in delivering horsepower to the prop, losing only 8 percent, while a sterndrive loses 13 percent. In I/Os and outboards, you have more control on the rudder and the direction to take when reversing your vessel, but in inboards, it’s fairly limited, and you have to be constantly in gear to change the direction. As outboard motors have become more powerful, they are gaining popularity on larger cabin cruiser and day boats that once were always equipped with inboard engines. An inboard’s running gear also leaves a cleaner, flatter alley behind the boat, which wakeboarders love. Outboards are available from tiny 2-horsepower kickers to 600 horsepower, but for family boating the range is typically 90 to 300 horsepower. Also, corrosion is less of a concern with inboard running gear than with an aluminum sterndrive. There are fewer elements to break, wear out or service. Outboard propulsion systems are generally more efficient and you can get more performance per horsepower compared to inboard and I/O boats. Gearing can be specified to suit the boat, engine and style of boating.Ĭompared with all the shafts, U-joints, bellows and steering components of a sterndrive, an inboard (even one with a V-drive transmission) is less complex. However, today’s V-drive transmissions from companies such as Twin Disc, Velvet Drive and ZF (all of which bolt directly to the back of the engine, which faces backwards in these systems) offer smoother and quieter operation. The V-drive transmission systems of yesteryear possessed a bad reputation for their racket and gear noise. Crowded compartments, coupled with belts and pulleys facing aft against the transom, impede service. Plus, a V-drive gobbles up more room belowdecks than a sterndrive by virtue of a transmission and muffler system. In the photo it can be seen that the thin wing bends down considerably when on ground, and that there is no room for a forward extended pod at this place.However, the engines are not as far aft as in a sterndrive. ![]() The remaining one was mounted past the fowler flaps almost at the tip - a cluster of three engines may provide cooling issues for the middle one. ![]() Four were mounted in twin pods, at about 1/3 span in order to provide decent bending and flutter relief to the thin wing. ![]() The B-47 required six engines of the type with maximum thrust that was available at the time. The mass of the engines also acts as counter-flutter weights. This arrangement reduces the bending moment at the wing roots, saving structural weight. Outboard motors are more compact than inboard motors, which means that they take much less space on a boat, providing passengers with additional room. with the twin inboard turbojet engines mounted in neat pods, and the outboard engines tacked under the wings short of the wingtips. OUTBOARD The inboard boats draw less (they need less water to float) than a sterndrive if the sterndrive is all the way down. The wing's flexibility was a concern, as it could flex as much as 17.5 ft (5.3 m) at the tip, and major effort was expended to ensure that flight control could be maintained as the wing moved up and down. A sterndrive boat can also be known as an inboard/ outboard, simply because they combine features that are found on both inboard and outboard engines. ![]()
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