Formula for speed?

totodog · 08-22-2009, 09:19 PM

What exactly is the formula to calculate the speed of a boat? I know range uses tangent(angle) = mast/distance, and the AoB can be calculated using some angle measurements. Could anyone tell me the formula for the speed of a boat? Thanks.

Sag75 · 08-22-2009, 09:26 PM

I don't know the formula, but I'm sure it uses the bearing variation of the locked target, AoB and range.

JMV · 08-23-2009, 02:20 AM

Have a look there, may be you find what you need ( 08:17:09 ) :

http://www.subsim.com/radioroom/showthread.php?t=154918

Something like this may be :

Metric : 1852m / 3600s = .51 (constant). 1/.51 = 1.96 (constant)

When the answer is in meter per second we can either multiply by 1.96 or divide by .51 to get knots.

therefore,

2.3 mps / .51 = 4.5 knots

Imperial: 2026 yds. / 3600 s = .56 (constant). 1/.56 = 1.78 (constant). Either divide yds. per second by .56 or multiply by 1.78 to get speed in knots.

There are more examples in the ditto thread.

Snestorm · 09-28-2009, 02:58 PM

Speed x Time = Distance
Distance over Time = Speed

08-22-2009, 09:19 PM	#1
totodog A-ganger Join Date: May 2008 Posts: 77 Downloads: 10 Uploads: 0	Formula for speed? What exactly is the formula to calculate the speed of a boat? I know range uses tangent(angle) = mast/distance, and the AoB can be calculated using some angle measurements. Could anyone tell me the formula for the speed of a boat? Thanks. Last edited by totodog; 08-22-2009 at 09:35 PM.

08-22-2009, 09:26 PM	#2
Sag75 XO Join Date: Nov 2007 Location: Canada Posts: 424 Downloads: 45 Uploads: 0	I don't know the formula, but I'm sure it uses the bearing variation of the locked target, AoB and range. __________________ Betasom - XI Gruppo Sommergibili Atlantici http://www.betasom.it/forum/index.php

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08-23-2009, 02:20 AM	#3
JMV Samurai Navy Join Date: Jun 2008 Location: Galway-IRELAND Posts: 576 Downloads: 179 Uploads: 0	Have a look there, may be you find what you need ( 08:17:09 ) : http://www.subsim.com/radioroom/showthread.php?t=154918 Something like this may be : Metric : 1852m / 3600s = .51 (constant). 1/.51 = 1.96 (constant) When the answer is in meter per second we can either multiply by 1.96 or divide by .51 to get knots. therefore, 2.3 mps / .51 = 4.5 knots Imperial: 2026 yds. / 3600 s = .56 (constant). 1/.56 = 1.78 (constant). Either divide yds. per second by .56 or multiply by 1.78 to get speed in knots. There are more examples in the ditto thread.

09-28-2009, 02:58 PM	#4
Snestorm Bilge Rat Join Date: Sep 2009 Posts: 1 Downloads: 1 Uploads: 0	Speed x Time = Distance Distance over Time = Speed