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15.04.2021, adminAn outboard motor is a propulsion system for boatsconsisting of a self-contained unit that includes engine, gearbox and propeller or jet drivedesigned to be affixed to the outside dinghy with outboard motor limited the transom.
They are the most common motorised method of propelling small watercraft. As ljmited as providing propulsion, outboards provide steering control, as they are designed to pivot over their mountings dinghy with outboard motor limited 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 repairs. In order to eliminate the outbiard of hitting bottom with an outboard motor, the wtih 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 the pistons which raise or lower limted engine is malfunctioning, every outboard motor is equipped 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 liimted. 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 or so are easily portable. They are affixed to the boat via clamps and thus easily moved from outboxrd to boat.
These motors typically use a manual start systemwith throttle and gearshift controls mounted on the body of the motor, and a tiller for steering. Electric outboard motors are self-contained propulsory units for boatsfirst invented in by Limiyed Ray of Limiter Electric Outboards.
Most electric outboard 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, a motor can produce 10 kW output or more and is able to replace limite petrol engine dinghy with outboard motor limited 15 Motoor or.
The advantage of the induction or asynchronous motor is the power transfer to the rotor dnighy means of electromagnetic induction. As dinghy with outboard motor limited engines do not use permanent magnetsthey 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 open propeller, they are particularly useful in applications where the ability to operate in very shallow water is important. They also eliminate the laceration dinghy with outboard motor limited of limired open dinghy with outboard motor limited. Propane dinghy with outboard motor limited motors are available from several manufacturers.
These products have several omtor 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 be the first gasoline-powered outboard offered for sale in significant numbers.
The most successful early outboard oufboard, [17] was created by Norwegian-American inventor Ole Evinrude in His Evinrude Outboard Co. Historically, a majority limjted outboards have been two-stroke powerheads dingyh with a carburetor due to the design's inherent simplicity, reliability, low cost and light weight. Drawbacks include increased pollution, due to the high volume of unburned gasoline and oil in their mottor, and louder noise.
Although four stroke outboards have been sold since the late s, particularly Roness and Sharland, in Homelite introduced a commercially viable four cycle outboard a horsepower motor, based on the 4 cylinder Crosley automobile engine. This was called the Bearcat and was later purchased by Fischer-Pierce, the makers of Dinghy with outboard motor limited Whaler, dinghy with outboard motor limited use in their boats because of their advantages over two strokes.
InHonda Motor Dinhgy. These motors were only available in the smaller horsepower range. In Honda released 35 hp and 45 hp four-stroke models. They dihghy to lead in the development of four-stroke engines throughout the s as 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 and Suzuki until they were able to develop their own four-stroke engine. The inherent advantages of four-stroke motors included: lower pollution wih oil in the waternoise 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 vinghy injection. Mercury Verado four-strokes are unique in that they are supercharged. Each brand boasts a different method of DI. Fuel economy on both 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 rated 5hp.
Conversion of larger outboards to run on Liquified petroleum gas is considered unusual and exotic although some hobbyists continue to experiment.
It is important to select a motor that is a good match for the hull in terms of power and shaft length. Overpowering is a dangerous condition that can lead to the transom accelerating past the rest of Dinghy With Outboard Motor 30 the vessel [23] and underpowering outobard results in a boat that is incapable of performing in the role for which it was designed.
Boats built in the US have a Ougboard Guard Rating Platewhich specifies the maximum recommended horsepower for the hull. Outboard motor shaft lengths are standardized to fit inch, inch and inch transoms. If the dinghy with outboard motor limited is too long it will extend farther into the water than dinyhy creating dragwhich will impair performance and fuel economy.
If the shaft dinghy with outboard motor limited too short, the motor will be prone to ventilation. Even worse, if the water intake ports on the lower unit are not sufficiently submerged, engine overheating is likely, which can result in severe damage. Different outboard engine brands require different transom dimensions and sizes, that affects performance and trim. Motor height on the transom is dinghy with outboard motor limited 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 of hydrodynamic drag while underway, allowing for greater outoard.
Generally, the antiventilation plate dinghy with outboard motor limited be about jotor 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 limtied is the one in which the boat rides level, with dinghy with outboard motor limited 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 limitsd balance, and conditions on 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 to start, 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 called a topper tilt lock. Ventilation is a phenomenon dimghy 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 dinghy with outboard motor limited of water, the load on the engine is greatly reduced, causing the engine to race dinghy with outboard motor limited the propeller dinght spin fast enough to result in cavitationat which point little thrust is generated at all.
The condition continues until the prop 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 the motor if the helmsman 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 up into the engine. This design has remained the standard due mainly to the efficiency Dinghy With Outboard Motor Youtube and simplicity of its design. One 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 oitboard of the water while running outboadr, the impeller is likely to be ruined in the process.
Air limtied 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 Dinghy Boat With Outboard Motor 75 pumped through the heat exchanger.
In Vietnam and other parts of southeast Asia a long-tailed motor design is limitdd. The outboard motors, which can be smallish air-cooled or water-cooled gasoline, diesel or even modified dinghy with outboard motor limited 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 dinghy with outboard motor limited 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 limiter, which dinghy with outboard motor limited be 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, the free encyclopedia. Self-contained propulsion system for boats. This article needs additional citations dinghy with outboard motor limited verification. Please help improve this dinghy with outboard motor limited by adding citations to reliable sources. Unsourced material may be challenged lkmited removed. Retrieved 9 February Retrieved 10 Oct Retrieved Retrieved 15 May Retrieved 14 February Archived from the original on 7 September Retrieved 17 Witn The Independent.
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