Tachy-tele wristwatch

[Hitman]

Regarding the telemeter:

I think you made the calculation too complicated. The way to make it easier is to use the same units for both input and output, hence you should convert a ship's length to nautical miles (1802 metres).

A 180 metres ship is 0,10 NM

A 90 metres ship is 0,5 NM

A 45 metres ship is 0,25 NM

Following your example they would respectively be travelling at:

120x0,10=12 knots

120x0,5=6 knots

120x0,25=3 knots

But anyway yes, the U-Jagd chrono is still superior

Regarding the tachymeter:

Here is a US Civil War artillery chrono. The inner scale is adjusted to the speed of sound, and it was used to determine distance to enemy artillery by timing the difference between seen the flash and hearing the sound.



See if the scales match :hmm:

You ask for its use, and the answer is simple: Artillery The U-Boats carried a deck gun, remember? Also they could be fired upon by enemies while unable to dive, or they could want to see the distance to a distant battle taking place over the horizon at twilight, etc. But also its use was for metereology, to measure the time between lightning and thunder and determine if a storm is closing or heading away.

Regarding the timed torpedo runs:

The importance of them was:

-To check wether estimations made by the Kaleun or IWO had been correct, overestimated or undersestimated

-To have an idea of when there would be a huge sound in the water that could eventually render enemy hydrophones useless for some minutes

-Similarly, to have an idea of when the enemy escorts would be alerted about the prescence on a submarine

-To listen carefully to the proper bearing for a possible dud or premature detonation (Something BdU emphasized a lot)

I think there will be some more, but right know I can't remember them :hmm:

[Jimbuna]

Thanks for the heads up joe and an excellent explanation H

I was seriously interested until I read to the bottom of the page and saw the price

[joegrundman]

Hi Jimbuna..me too!

Hitman,

excellent, although if you will permit me this small quantum of pedantry, i think you have the names of Telemeter and Tachymeter/Tacheometer swapped around.

The scale from the Civil war artillery chrono does match the Hanhart telemeter scale, after adjusting miles for kilometers. Besides you can calculate it since you can see that 3.4 km matches 10 seconds, and as we all know the speed of sound in air is 343.14m/s at 20 degrees C.

thanks for providing the use - i'd forgotten about deckguns, and also thanks for explaining the use of timed torpedo runs - you know it was never something i'd really thought of as important information, i guess i should.

Finally, does SH4/3 take into account the distance and speed of sound with artillery explosions

[badwolf]

Hi joe
I thought you were paddling about in the pacific.
Anyway I do like the watch.

There was a mod released long ago called Avg.Joes Torpedo & Deck gun Speed-of-Sound Explosions Delay v1.2+.rar
Here's part of the readme

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This is a Silent Hunter III (v1.4) sound-delay mod, which changes 5 things:

1. After a torpedo has hit a target, there is an approximate 2-second delay, before any explosion sound(s) will be heard.

2. After a target has been hit with 88mm/105mm deckgun, there is an approximate 1.75 second delay, before any shell-strike sound is heard.

3. The main torpedo explosion .wav file (P11_@ref_torp_great_explosion.wav), has been modified/mixed a bit, to cause a bit more dramatic explosion sound.

***4. The default deckgun .wav file (P09_$Gun_muzzle_flash.wav) has been changed, to make the gun-sound more dramatic.

5. Several explosions are a bit louder than default, and also mixed with other (minor) explosion wave-files, to create (hopefully) more dramatic explosion sounds.
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Whether this is incorporated in the supermods I can't say.

[Hitman]

although if you will permit me this small quantum of pedantry, i think you have the names of Telemeter and Tachymeter/Tacheometer swapped around.

Oh no, no pedantry at all, your are right but the definition seems to be a bit confusing, some sites talk about telemeter others about tachymeters

Finally, does SH4/3 take into account the distance and speed of sound with artillery explosions

Sh4 certainly does (Though I can't tell how exact it is), SH3 unfortunately not IIRC the mod that badwolf refers to gives a fixed delay for all sounds, so you would experiment the same delay at 500 or 15000 metres distance. A hardcore limitation, I'm afraid.

[joegrundman]

Hi Badwolf, yes' ive been doing a couple of campaigns with the fleetboats, but the atlantic is where the heart is!

Anyway i'm thinking that for a couple of reasons it's only worth doing this watch for SH4UBM - one, speed of sound is only modelled in sh4, and without that the telemeter scale ahs no value at all, and secondly the SH4UBM chrono includes controllers for the minutes and hour hands of the clock while the SH3 stoppuhr is a stoppuhr only without being a clock too

thanks again Hitman