United Kingdom
Catalog   /   Camping & Fishing   /   Fishing   /   Boat Motors

Comparison Jetmar T6 vs Parsun T5.8BMS

Add to comparison
Jetmar T6
Parsun T5.8BMS
Jetmar T6Parsun T5.8BMS
from $691.20
Outdated Product
from $819.12 up to $831.60
Outdated Product
TOP sellers
Applicationboatboat
Motor typepropellerpropeller
Motor
Engine typepetrolpetrol
Motor duty cycle2-stroke2-stroke
Maximum power6 hp5.8 hp
Maximum power4.74 kW4.3 kW
Maximum revolutions5200 rpm5500 rpm
Number of cylinders1 pcs1 pcs
Capacity102 cm3102 cm3
Piston diameter54 mm55 mm
Piston stroke43 mm43 mm
Coolingliquidliquid
Exhaust systemabove propellerabove propeller
Fuel system
Fuel system typecarburetorcarburetor
Fuel tankbuilt-inbuilt-in
Fuel tank volume2.5 L2.7 L
Recommended fuelAI-95 gasolineAI-95 gasoline
Drive unit
Gear ratio2.082.08
Propeller screw3-bladed3-bladed
Gear
forward
neutral
reverse
forward
neutral
reverse
Equipment
Transom height (deadwood)381 mm381 mm
Control systemtillertiller
Launch typemanualmanual
Leg lift (trim)manualmanual
General
Dimensions1060х490х320 mm1014х700х343 mm
Weight21 kg20 kg
Added to E-Catalognovember 2016june 2015

Maximum power

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

Horsepower (hp) has traditionally been used primarily to refer to the power of internal combustion engines, including gasoline engines (see "Engine type"). However, in outboard motors, these units are also used for electric models (see ibid.). This is due to the fact that the majority of gasoline engines are on the market, and boat manufacturers prefer to indicate the maximum recommended engine power in “horses”.

The general patterns when choosing outboard motors in terms of power are as follows. On the one hand, a more powerful unit will allow you to develop more speed and is better suited for a heavy boat (see "Maximum boat weight"). On the other hand, weight, dimensions, cost and fuel/energy consumption also directly depend on power. Therefore, it does not always make sense to chase the maximum performance.

In addition, the choice of motor for maximum power also depends on the characteristics of the craft on which it is planned to be used. It is not worth exceeding the recommended power stated in the specifications — firstly, the boat transom may not be designed for a heavy large-sized unit, and secondly, the boat itself may not be suitable for acceleration to high speeds. There are also more specific recommendations. For example, from the point of view of efficiency and safety, the engine power at the level of 60 – 80% of the ma...ximum specified in the characteristics of the boat is considered optimal. Lower values may be useful if economy and low noise level are important to you, and higher values if high speed and acceleration dynamics are key points.

There is one more specific point associated with this parameter: most often, the characteristics indicate the power output directly to the propeller, however, some manufacturers (mostly east european) can go for a little trick, indicating the power on the main motor shaft. When power is transferred to the screw, losses inevitably occur, so the useful power of the motor in such a case will be less than claimed. Thus, when choosing and comparing, it's ok to clarify what kind of power is meant in the characteristics — on the propeller or on the shaft.

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.

Maximum revolutions

The highest shaft speed that the outboard motor is capable of developing.

Theoretically, the speed of rotation of the propeller (or turbine — see "Motor type") depends on the engine speed, and, accordingly, the speed that the boat is capable of developing. However, in addition to this indicator, many other factors also affect the performance of the motor — engine power (see above), gear ratio (see below), propeller design, etc. As a result, situations are quite normal when a more powerful and high-speed motor has lower revolutions than the weaker one. Therefore, this parameter is, in fact, a reference one, and has almost no practical value when choosing. Unless it can be noted that high-speed motors are more susceptible to noise and vibration than low-speed ones; however, this moment can be compensated by the use of various technical tricks.

Piston diameter

The diameter of a single piston in a gasoline (see "Engine type") outboard motor. In most cases, this parameter is purely reference; situations where data on the piston diameter is really needed are extremely rare — usually during the repair or maintenance of the engine.

Fuel tank volume

The total volume of the fuel tank provided in the design or delivery set of the outboard motor (depending on the type of tank — see "Fuel tank").

The larger the capacity of the fuel tank, the longer the engine will be able to work without refueling, the less often it will be necessary to replenish the fuel supply in the tank. On the other hand, volumetric tanks have appropriate dimensions and weight, especially when filled; the latter is especially critical for motors with built-in tanks (see above).

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.
Jetmar T6 often compared
Parsun T5.8BMS often compared