The first rule is that there is no craft going out into the open sea or traveling without having a spare propeller with it. The propeller for the boat is that for the car the suspension, the tires and the scraper together. The propeller can destroy or highlight a boat.
So consider how important it is. Never a propeller does not do all the work. Always a second propeller (which is necessary in any case for safety) will complement our range of uses. Learn to change a propeller.
It is a simple process that if you do it twice on land, you will do it very easily and through the boat in the sea. It's easier to change the wheel in the car. Often we will hear the propellers examining only their step and sometimes the number of their feathers. Since we are talking about this earth, let's see how the propellers are encoded. So we will see a number written eg. 15X21X3. The first number refers to the diameter of the propeller, the second to the pitch, and the third to the number of fins. The first two numbers are in inches. The 15 speaks about the diameter of the propeller that you measure from the edges of her fins.
The 21 step you count again in inches and tells you how long the ship covers each turn of the propeller. And in this case, the propulsion is 21 inches per revolution. Apart from these 3 elements, however, there are many other elements, such as the rake, the cup (which refers to the blade cavity), the bend at the tip of the fins that controls the ability of the trimmings and many more that there is no need to analyze. What we have to note is that the propellers are separated, according to their properties, into browlift in stern lift, and in neutral. Of course there are also surface propellers, which are their own category, and they concern more racing boats and not so much recreation.
Depending on your boat, and its needs, you must oversee one of the three categories of propellers. What their properties are, the manufacturer says in its manual (unless you can distinguish it from your own geometry). So if you have a boat that raises the bow, you want a stern lift, coke. A big question is 3 or 4 wings? The four-footed propellers will, as a general rule, help a vessel that is moving at low speeds. (except those for super sport boats). Caution, however, The four-fingered propeller has higher rotation resistance, and may increase consumption and reduce top speed.
Since the propellers of this design have an emphasis on medium speeds. Also in narrow boats may increase the trend to the left. Tender propellers are the most common solution in the widest range of uses. They can give a good average in terms of performance, economy and general behavior.
As far as the propeller step is concerned, the way to choose it is, freely on board, with two people, half the fuel, the engine full of trim and a calm sea, the turns reaching the maximum limit given by the manufacturer. Calculate that each inch of step we are going up, reduces the turn by about 150. So, if your engine overcalls, you need to upload the step accordingly. If it spins, you need to download it accordingly.
Caution A motor with a propeller larger than the right pitch is burned burns a lot of fuel, and it makes it hard for you in bad weather. For example, it's like trying to drive up a fifth high uphill.
The TROPIDA boats are in compliance with EU directives of CE class C and the company is in the ISO 9001 /2015 certification BY BYREAU VERITAS