Would you like to calculate speed by prop turns?

kv29 · 07-04-07, 07:38 PM

I was reading an online TDC manual and in some chapter it said that you could calculate a ship speed by counting the props rpm. Skippers had a recognition manual named ONI 41-42 in which every ship had the max speed & rpm, so using the sonar we can do the same by simple math.

I was thinking about doing a table like this with a default timeframe of 10 seconds:

I´ve checked a couple of ships and it works ok.
What do you think?

07-04-07, 07:38 PM	#1
kv29 Watch Officer Join Date: May 2007 Location: Buenos Aires Posts: 342 Downloads: 2 Uploads: 0	Would you like to calculate speed by prop turns? I was reading an online TDC manual and in some chapter it said that you could calculate a ship speed by counting the props rpm. Skippers had a recognition manual named ONI 41-42 in which every ship had the max speed & rpm, so using the sonar we can do the same by simple math. I was thinking about doing a table like this with a default timeframe of 10 seconds: I´ve checked a couple of ships and it works ok. What do you think? Last edited by kv29; 07-04-07 at 08:18 PM.