In this post we'll talk about two tools you can find on board our boat: the log el 'sounder. The log is a tool that indicates that our speed is measured on the surface of the sea, and takes no account of external factors.
There are different types Log in:
-helix;
-pressure;
- electromagnetic .
Log propeller:
Built by a propeller located below the waterline, fore-aft axis oriented and connected to a sensor device. According to the principle that the speed of rotation is proportional to boat speed tool will provide me with the same speed. Log
pressure:
Built by a tube (Pitot tube) dipped below the waterline, oriented fore-aft axis and connected to a sensor device. According to the principle that the pressure inside the tube is proportional to the square of speed through the tool will provide me with the same speed.
Electromagnetic:
Built by a magnet located below the waterline, fore-aft axis oriented and connected to a sensor device. According to the principle that the tension between the two poles is proportional to boat speed tool will provide me with the same speed.
NB in \u200b\u200ball three cases the instrument is oriented in the direction of the bow, this is the reason why the log will always give me only the apparent speed.
Log propeller:
Built by a propeller located below the waterline, fore-aft axis oriented and connected to a sensor device. According to the principle that the speed of rotation is proportional to boat speed tool will provide me with the same speed. Log
pressure:
Built by a tube (Pitot tube) dipped below the waterline, oriented fore-aft axis and connected to a sensor device. According to the principle that the pressure inside the tube is proportional to the square of speed through the tool will provide me with the same speed.
Electromagnetic:
Built by a magnet located below the waterline, fore-aft axis oriented and connected to a sensor device. According to the principle that the tension between the two poles is proportional to boat speed tool will provide me with the same speed.
NB in \u200b\u200ball three cases the instrument is oriented in the direction of the bow, this is the reason why the log will always give me only the apparent speed.
We talked about the bay, and give according to what Calum backdrop of where we are. To know the depth of our background we use the depth sounder. Even for this instrument there are two types: one hand, more traditional and less effective, el'ecoscandaglio. sounder Hand:
Consisting of a weight attached to the tops, when the weight touches the bottom you retrieve the line and measuring the depth is achieved. Obviously this system is obsolete and a serious lack of it can be used only with the boat stops.
sounder :
sounder :
consists of an apparatus for transmitting ultrasound. Knowing the speed of propagation of ultrasound, and calculating the elapsed time between emission and return of the sound the instrument calculates the depth. Fair winds to all!
0 comments:
Post a Comment