Tutorial -determine type, speed, RPM, of merchant using hydrophone(no visual contact)

[Macardigan]

(all google translation from spanish)
Hi again.

important: To use this tutorial in the game you need to have installed the MOD-RPM Hydrophone merchants 2.x- link mod: http://www.subsim.com/radioroom/showthread.php?t=204151

TUTORIAL

determine type, speed, RPM, of merchant using Hydrophone. (no visual contact)
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- Current date: 01/01/1941
- Heavy fog.


1. We have a contact hydrophone: Merchant, moving fast.

2. If the merchant is close enough to hear well its propeller, then we will calculate your RPM. (revolutions per minute).

3. We are going to hydrophone station and count the revolutions of the propeller of the merchant in a minute. Result: ~78 RPM
*Link to the video tutorial explaining how to count RPM using the hydrophone: link: (results differ from this tutorial, it is only to explain how it is calculated)





4. Next step. Determine the type of merchant using the hydrophone (CARGO, LIBERTY, PASSENGER, OilTanker)
*Link to the video tutorial explaining how to determine the type of merchant using the hydrophone: link:
Result: CARGO (This result is invented by me. This is not the result of the video tutorial).





5. Next step. Looking at the sheet we see that the merchant "SV small comp. Merchant" does not reach 78 rpm at maximum speed. 13 knots. So we can exclude it.





6. The following method of discards. Discard a ship that has not yet entered the campaign considering our current date.
Middleton attack transport: None country puts this ship at sea until 5/13/1942 (see Recognition Manual > Technical Data) This is later than our current date (01/01/1941).
C2-s-b1 hull large merchant: None country puts this ship at sea until 11/12/1941 (see Recognition Manual > Technical Data) This is later than our current date (01/01/1941).
Victory Cargo: None country puts this ship at sea until 02/28/1942 (see Recognition Manual > Technical Data) This is later than our current date (01/01/1941).
Then these merchants are discarded.






7.Finally we look at the merchants that we have not excluded and analyze the results to conclude with a correct speed of the ship. (heard by hydrophone)

If I have to choose one of the results, choose the SV_Medium_freighter to 13 knots. It is the closest to 78 rpm.
...but may be another ... who knows ...



If you find wrong data, this is a tutorial, is not data from a game played.
- The End -


- Questions ???


Greetings to all.

Good hunting.