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The latest generation of outboards are designed for increasingly heavy boats, such as the fisherman in the photo.
It’s not just the powers that are growing, but also the cubage. Objective? More torque from low rpm. How to unleash this pair?
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The most powerful outboards have very large displacements (over 7 liters) and fractionations up to 12 cylinders with which they reach the 600-horsepower mark.
An increase that also increases torque, the magnitude that provides thrust.
Drive torque is the force applied by combustion on the crankshaft, via the pistons and connecting rods acting on the cranks.
Higher torque is perhaps more important than horsepower, because we can have all the horsepower we want, but if we cannot “unload” it well at sea it is of little use.
What about the propellers?
An outboard with two counter-rotating ones provides more grip in the water, distributing torque evenly over both so that performance can be better utilized.
It is suitable for more grip in the water or when motoring heavier hulls.
There are mainly two brands on the market that equip their outboards with this solution.
On the one hand, a pioneer, is Suzuki, which both on the DF300 and on the DF350 has this particular setup available.
Recently, another brand has also espoused this philosophy, but on a decidedly different engine: the V12 from Mercury Marine from 600 horsepower, the most powerful outboard in production today.
This solution ensures a greater “grip” in the water, distributing the engine torque evenly over both propellers so that power can be better harnessed.
In addition, two counter-rotating propellers cancel out the evolutionary effects that, on the other hand, characterize single-propeller engines, which tend to pull to starboard or port, depending on their direction of rotation. Of course, not everyone needs it.
This works very well especially with large and heavy hulls, now the “home field” for outboards.
Saxdor 340 GTWA, un super walkaround dal prezzo interessante
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