hello,
i'm kumar, studying marine engineering in indian maritime university, chennai. I have been asked to prepare a working model of HIGH SPEED ALARM KIT. i actually have no idea,how to do it, i request you to provide me the details,and the systems,electronics used in this kit..

thanks in advance.

What exactly do you want to measure?The speed of the motor, speed of propeller or anything else?

yeah i thought of measuring rpm of propeller..but that may not be directly related to ship's velocity in some cases... so i have to calculate the actual live speed of the ship...how can i do this??..

i think, its you can do by developing an equipment for measuring relative speed in between static sea and moving ship (i again think , force exerted by cross block against flow is directly proportional to relative speed)