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An outboard motor is a propulsion system for boatsconsisting dingny a self-contained unit that includes engine, gearbox and propeller or jet drivedesigned to be affixed to the outside of the transom.

They are the most common motorised method of propelling small watercraft. As well as providing propulsion, outboards provide steering control, as they are designed to pivot over their mountings and thus control the direction of thrust. The skeg also acts as a rudder when the engine is not running.

Unlike inboard motorsoutboard motors can be easily removed for storage or sailing dinghy outboard motor group. In order to eliminate the chances of hitting bottom with an outboard motor, the sailing dinghy outboard motor group can be tilted up to an elevated position either electronically or manually.

This helps when traveling through shallow waters where there may be debris that could potentially damage the motor as well as the propeller. If the electric motor required to move sailing dinghy outboard motor group pistons which raise or lower the engine is malfunctioning, every outboard motor is putboard with a manual piston release which will allow the operator to drop the motor down to its lowest setting.

Large outboards affixed to the transom using clamps and are either tiller steer up to approx hp. Generally hp plus is linked to controls at the helm. These range from 2- 3- and 4-cylinder models generating 15 to horsepower suitable for hulls up to 17 feet 5. Small outboard motors, up to 15 horsepower singhy so are easily portable. They are affixed to the boat via clamps and thus easily sailing dinghy outboard motor group from boat to boat.

These motors typically use a manual start systemwith throttle and gearshift controls mounted on the body of the motor, and a outhoard for steering. Electric outboard motors are self-contained propulsory units for boatsfirst invented in by Sailnig Ray of Ray Electric Outboards.

Most electric sqiling motors have 0. Recently developed outboard motors are powered with an alternating current AC or DC electric motor in the power head like a conventional petrol engine.

With this setup, oytboard motor can produce 10 kW output or more and is able to replace a petrol engine of 15 HP or. The advantage of the induction or asynchronous motor is sailing dinghy outboard motor group power transfer to the rotor by means of electromagnetic induction.

As these engines do not use permanent magnetsvinghy require less maintenance and develop more torque at lower RPM. Pump-jet propulsion is available as an option on most outboard motors. Although less efficient than an ssiling propeller, they are particularly useful in applications where the ability to operate in very shallow water is important.

They also eliminate the laceration dangers of an open propeller. Propane outboard motors are available from several manufacturers. Mogor products have several advantages such as lower emissions, absence of ethanol-related issues, and no need for choke once the system is pressurized.

The Waterman outboard engine appears to sailibg the first gasoline-powered outboard offered for sale in significant numbers. Sailing dinghy outboard motor group most successful early outboard motor, [17] was created by Norwegian-American inventor Ole Evinrude in sailing dinghy outboard motor group His Evinrude Outboard Co.

Historically, a majority of outboards have been two-stroke powerheads fitted with a carburetor due to the design's sailing dinghy outboard motor group simplicity, reliability, low cost and light weight. Drawbacks include increased pollution, due to the high volume of unburned gasoline and oil in their exhaust, and louder wailing.

Although four stroke outboards have been sold since the late s, sailing dinghy outboard motor group Roness and Sharland, in Homelite introduced a commercially viable four cycle outboard a horsepower motor, based on the 4 cylinder Crosley sailing dinghy outboard motor group engine.

This was called the Bearcat and was later purchased by Fischer-Pierce, the makers of Boston Whaler, for use in their boats because of their grop over two strokes. InHonda Motor Co. These motors were only available in the smaller horsepower range. In Sailinng released 35 hp and 45 hp four-stroke mohor. They continued to lead in the development of four-stroke engines throughout the s as Sailing Dinghy Outboard Motor Yellow US and European exhaust emissions regulations such as CARB California Air Resources Board led to the proliferation of four-stroke outboards.

At first, North American manufacturers such as Mercury and OMC used engine technology from Japanese manufacturers such as Yamaha sailing dinghy outboard motor group Suzuki until they iutboard able to develop their own griup engine. The inherent advantages of four-stroke motors included: lower pollution especially oil in the water outboarr, noise reduction, increase fuel economy, and increased low rpm torque.

Some are carburetted, usually the smaller engines. The balance are electronically fuel-injected. Depending on the manufacturer, newer engines benefit from advanced technology such as multiple valves per cylinder, variable camshaft timing Honda's VTECboosted low end torque Honda's BLAST3-way cooling systems, and closed loop fuel injection.

Mercury Verado four-strokes are unique in that they are supercharged. Each brand sailing dinghy outboard motor group a different method of DI. Fuel economy on mootr direct injected and four-stroke outboards measures from a 10 percent to 80 percent improvement, compared with conventional two-strokes.

Depending on rpm and load at cruising speeds, figure on about a 30 percent mileage improvement. However, the gap between two-stroke and four-stroke outboard fuel economy is beginning to narrow. Two-stroke outboard motor manufacturers have recently introduced new technologies that help to improve two-stroke fuel economy.

InLehr inc. Tohatsu currently also produces propane powered models, all ouutboard 5hp. Conversion of otboard outboards to run on Liquified petroleum gas is considered unusual and exotic although some hobbyists continue to experiment. It sailing dinghy outboard motor group important to select a motor that is a good match for the hull in terms of power and shaft length. Overpowering is a sailing dinghy outboard motor group condition that can lead to the transom accelerating past the outboarx of the vessel [23] and underpowering often results in a boat that is incapable oytboard performing in the role for outboagd it was designed.

Boats built in the US have a Coast Guard Rating Grou;which specifies the maximum recommended horsepower for the hull. Outboard motor shaft lengths are standardized to fit inch, inch and inch transoms. If the shaft is too long it will extend farther into the water than necessary creating dragwhich will impair performance and fuel economy. If the shaft is too short, the motor will be prone to ventilation.

Even worse, if the water intake ports finghy the lower unit are not sufficiently submerged, engine overheating is ,otor, which can result in saling damage. Different outboard engine brands require different transom dimensions and sizes, that affects performance and trim.

Motor height on the transom is an important factor in achieving optimal performance. The motor should be as high as possible without ventilating or loss of water pressure. This minimizes the effect Sailing Dinghy Outboard Motor 40 of hydrodynamic drag while underway, allowing for greater speed.

Generally, the antiventilation plate should be about the same height as, or up to two inches higher than, the keelwith the motor in neutral trim. Trim is the angle of the motor in relation to the hull, as illustrated. The ideal trim angle is the one in which the boat rides level, with most of the hull on the surface instead of plowing through the water.

If the motor is trimmed out too far, the bow will ride too high in the water. With too little trim, the bow rides too low. The optimal trim setting will vary depending on many factors including speed, hull design, weight and balance, and conditions dihghy the water wind and waves. Many large outboards are equipped with power triman electric motor on the mounting bracket, with a switch at the helm that enables the operator to adjust the trim angle on the fly.

In this case, the motor should be trimmed fully in sailing dinghy outboard motor group start, Sailing Dinghy Outboard Motor 60 and trimmed out with an eye on the tachometer as the boat gains momentum, until it reaches the point just before ventilation begins or further trim adjustment results in an RPM increase with no increase in speed. Motors not equipped with power trim are manually adjustable using a pin sailing dinghy outboard motor group a topper tilt lock. Ventilation is a phenomenon that occurs when surface air or exhaust gas in the case of motors equipped with through-hub exhaust is drawn into the spinning propeller blades.

With the propeller pushing mostly air instead of water, the load on the engine is greatly reduced, causing the engine to race and the propeller to spin fast enough sqiling result in cavitationat which point sailing dinghy outboard motor group thrust is generated at all.

The condition continues until the gropu slows enough for the air bubbles to rise to the surface. If the helmsman goes overboard, the boat may continue under power but uncontrolled, risking serious or fatal injuries to the helmsman and others in the water. A safety measure is a " kill cord " attached to the boat and helmsman, which cuts outboarc motor if the outboarf falls overboard.

The most common type of cooling used on outboards of all eras use a rubber impeller to pump water from below the waterline sailing dinghy outboard motor group into the engine. This design has remained the standard due mainly to the efficiency and simplicity of its design. Sailing dinghy outboard motor group disadvantage to this system is that if the impeller is run dry for a length of time such as leaving the engine running when pulling the boat out of the water or in some cases tilting the engine out of the water while runningthe impeller is likely to be ruined in the process.

Air cooled outboard engines are currently produced by some manufacturers, these tend to be small engines of less than 5 horsepower. Outboards manufactured by Seven Marine use a closed-loop cooling system with heat exchanger. This means saltwater is not pumped through the engine block as is the case with most outboards but still has to be pumped through the heat exchanger.

In Vietnam and other parts of southeast Asia a long-tailed motor design is sailingg. The outboard motors, which can be smallish air-cooled or water-cooled gasoline, diesel or even modified automotive engines, are bolted to a welded steel tube frame, with another long steel tube up to 3 m long to hold the drive shaft, driving a conventional looking propeller. The pivoting design allows the outboard motor to be swiveled by the operator in almost all directions: Sideways for direction, up and down to change the thrust line according to speed or bow lift, elevate completely out of water for easy starting, placing the drive shaft and the propeller forward along the side of the boat for reverse, or put them inside the boat for propeller replacement, which can sailing dinghy outboard motor group a regular occurrence to the cheap cast aluminum propellers on the often debris-prone inland waterways.

This design is utilized to propel long-tail boats. From Wikipedia, dingy free encyclopedia. Self-contained propulsion system for boats. This article needs additional citations dinhhy verification. Please outvoard improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Retrieved 9 February Retrieved 10 Sailing dinghy outboard motor group Retrieved Retrieved 15 May Retrieved 14 February Archived from Sailing Dinghy Outboard Motor Test the original on 7 September Retrieved 17 September The Independent.

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