fast calculate speed ship with periscope

Macardigan · 03-09-13, 07:27 PM

hi,
im from spain, bad english.

1. enemy ship moving at 90ºAOB ~aprox. (side view).
2. Put vertical line of periscope on bow ship and activate stopwatch.
3. When the stern reaches the vertical line.. stop the timer.

then:

Ship length
----------- X 1,85 = Speed in Knots.
time in sec

example:

cimmaron class tanker= 190,6 m (length)
time bow--->stern in sec= 38 seconds.

190,6 m
-------- X 1,85 = 9,27 Knots
38 sec

easy.

03-09-13, 07:27 PM	#1
Macardigan Engineer Join Date: Mar 2012 Posts: 219 Downloads: 199 Uploads: 0	fast calculate speed ship with periscope hi, im from spain, bad english. 1. enemy ship moving at 90ºAOB ~aprox. (side view). 2. Put vertical line of periscope on bow ship and activate stopwatch. 3. When the stern reaches the vertical line.. stop the timer. then: Ship length ----------- X 1,85 = Speed in Knots. time in sec example: cimmaron class tanker= 190,6 m (length) time bow--->stern in sec= 38 seconds. 190,6 m -------- X 1,85 = 9,27 Knots 38 sec easy.