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Comparison Jetmar T4 vs Hangkai M4.0HP

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Jetmar T4
Hangkai M4.0HP
Jetmar T4Hangkai M4.0HP
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Applicationboatboat
Motor typepropellerpropeller
Motor
Engine typepetrolpetrol
Motor duty cycle2-stroke2-stroke
Maximum power4 hp4 hp
Maximum power2.98 kW2.9 kW
Maximum revolutions5300 rpm5300 rpm
Number of cylinders1 pcs1 pcs
Capacity75 cm375 cm3
Piston diameter47 mm47 mm
Piston stroke43 mm43 mm
Coolingliquidliquid
Exhaust systemabove propellerthrough the propeller
Fuel system
Fuel system typecarburetorcarburetor
Fuel tankbuilt-inbuilt-in
Fuel tank volume1.4 L1.4 L
Recommended fuelAI-95 gasolineAI-92 gasoline
Drive unit
Gear ratio2.082.08
Propeller screw3-bladed3-bladed
Gear
forward
neutral
forward
neutral
Equipment
Transom height (deadwood)381 mm381 mm
Control systemtillertiller
Launch typemanualmanual
Leg lift (trim)manualmanual
General
Dimensions960х490х390 mm960х450х300 mm
Weight13.5 kg13 kg
Added to E-Catalognovember 2016june 2015

Maximum power

The maximum operating power of the outboard motor, expressed in kilowatts.

The practical value of motor power is described in detail in “Maximum power" is higher. Here we note that the kilowatt (derivative of watt) is just one of the units of power used in fact along with horsepower (hp); 1 HP ≈ 735 W (0.735 kW). Watts are considered the traditional unit for electric motors (see "Engine Type"), but for a number of reasons, outboard motor manufacturers use this designation for gasoline models as well.

Exhaust system

The design of the exhaust system in a gasoline outboard motor (see “Engine type”), more precisely, the method of exhaust gases used in this system.

Above the screw. This category includes two types of engines. The simplest option is when exhaust gases are emitted directly into the air. Such systems are extremely simple and cheap, but the exhaust can create a noticeable inconvenience for people in the boat (not only because of the gases, but also because of the rather high noise level); therefore, they are found only in the simplest outboard motors, and even then quite rarely. A more common option is to release exhaust gases into the water above the propeller (most often through the so-called anti-cavitation plate — a flat ledge above the propeller). Such systems are more comfortable than "air" ones, while they are simpler and cheaper than propeller exhaust (see below), although they are still considered less technically advanced.

Through the screw. In systems of this type, the exhaust is led into the water directly through the propeller hub; in fact, the position of the exhaust pipe coincides with the axis of rotation. This reduces the noise level compared to systems using exhaust over the propeller, and also slightly increases power and traction characteristics. The downside of these advantages is the design complexity and, accordingly, the high cost.

Recommended fuel

The type of gasoline recommended for use in an internal combustion engine outboard (see "Engine Type"). In fact, this paragraph indicates gasoline with the lowest octane rating that is allowed to be used in the engine; higher rates are allowed, lower ones are highly undesirable, if not outright prohibited.

The octane number is an indicator that determines the resistance of a particular brand of gasoline to detonation (self-ignition during compression in the cylinder). Detonation is a very undesirable phenomenon, because. it leads to an increase in engine loads simultaneously with a decrease in its power and an increase in the amount of harmful substances in the exhaust gases. And this phenomenon occurs in cases where the engine uses gasoline with lower octane numbers than those for which the unit is designed.

Automobile gasoline, which is also used for refueling boat engines, is marked with the AI or RON index; the first option is used in the characteristics of east european motors, the second — in foreign ones. However, in both indexes, the number after the letters means the octane number. The higher this number, the more demanding the engine is on fuel quality. Thus, for example, a unit under AI-92 will be able to work normally with AI-95, but AI-90 or AI-87 cannot be filled into it. "Record holders" for unpretentiousness today are engines that can work even on the AI-76; but they are a rare exception to the general rule.

Weight

The total weight of the outboard motor. This parameter is indicated, usually, only for the unit itself, without taking into account the fuel in the tank and the tank itself (if it is external, see "Fuel tank"), as well as additional equipment. Motor weight data can be useful in order to estimate the overall balance of the boat and the change in its payload capacity.
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