No TDC on Suger Boats

RickC Sniper · 04-02-07, 01:44 PM

WTG Don,

don1reed · 04-02-07, 02:16 PM

Hey, hey...its the, Frank Kulick, method from SH1

.

Jungman · 04-02-07, 02:39 PM

That works well, nice information. But in WWII they did not have a calculator to compute those fun conversions, arcsin, sin, even divide? I thought that is what they use the TDC for (as a calculator).

Though I do admit, I also make the same manual calculation without the TDC...except I stick into the TDC just for fun.

I think they would have had to use that nomograph, wizwheels and stuff (no TDC ). How did they do it without the power of a modern calculator, or a TDC? BTY what is a Sugar boat? the S-class?

nattydread · 04-02-07, 02:43 PM

I assume they had spread-sheets for the trig computations. I have one. They also had a another guy or two doing the computations and map plotting other then the guy looking through the scope to make it efficient time wise considering they couldnt pause real life

WFGood · 04-02-07, 03:01 PM

Absolutely, there would be someone to make the calculations while the captain made the observations. Slide rules and charts would have to suffice to make the calculations. I have a copy of the Submarine Torpedo Fire Control Manual, circa 1950, and it does have quite a few "plates" in the back which contain angles, slopes, etc. It also provides things such as "lead angle for target beyond critical range" and SINa = target speed/torpedo speed. I haven't had a chance to read through it entirely, but I have a lot of respect for someone who can do that and hit a target. BZ!

John Channing · 04-02-07, 03:01 PM

I believe they had a circular slide rule called an "Is/Was" or "Banjo".

JCC

Jungman · 04-02-07, 03:27 PM

Thanks for the info. You know, it maybe cool to try to reproduce those tables and banjo thingy to do it the old fasion way, no modern calculator.

One other question, in SH3 someone did have a way to determine speed by listing to the number of revolution of the screws via hydrophone. It was bit hard to use depending on what ship you were listening too. iRL you did not know this ship's ID.

If the hydrophone does not work at PD, you can still get range via an active sonar ping to the target. I am surprised that a warship's passive sonar guy did not hear that. Is that realistic> pinging the target to get range via active sonar at PD? without spooking the warship.

Modern ships/subs would hear that immediately. I guess in the old days, it was hard to hear that one or two pings unless they got real lucky.

WFGood · 04-02-07, 05:19 PM

I have the files. They may not reproduce very well, but I can try and post it to my personal webpage and let people look at it and take what they will.

Sailor Steve · 04-02-07, 05:20 PM

Aw, man, I read the title and thought "Really? They don't have them in the game? COOL!"

It isn't even April first anymore; it wasn't even a joke...but it got me anyway!

:rotfl:

04-02-07, 01:44 PM	#1
RickC Sniper Undetectable Join Date: Sep 1999 Location: Colorado Posts: 1,221 Downloads: 132 Uploads: 0	WTG Don, __________________ Support Subsim http://www.subsim.com/store.html

04-02-07, 02:16 PM	#2
don1reed Ace of the Deep Join Date: Dec 2004 Location: Valhalla: Silent Generation Posts: 1,149 Downloads: 910 Uploads: 0	Hey, hey...its the, Frank Kulick, method from SH1 . __________________ [SIGPIC][/SIGPIC] During times of universal deceit, telling the truth becomes a revolutionary act. ~ George Orwell

04-02-07, 03:01 PM	#5
WFGood Electrician's Mate Join Date: Sep 2003 Location: high above the big blue Posts: 137 Downloads: 0 Uploads: 0	Absolutely, there would be someone to make the calculations while the captain made the observations. Slide rules and charts would have to suffice to make the calculations. I have a copy of the Submarine Torpedo Fire Control Manual, circa 1950, and it does have quite a few "plates" in the back which contain angles, slopes, etc. It also provides things such as "lead angle for target beyond critical range" and SINa = target speed/torpedo speed. I haven't had a chance to read through it entirely, but I have a lot of respect for someone who can do that and hit a target. BZ! __________________

04-02-07, 05:19 PM	#8
WFGood Electrician's Mate Join Date: Sep 2003 Location: high above the big blue Posts: 137 Downloads: 0 Uploads: 0	I have the files. They may not reproduce very well, but I can try and post it to my personal webpage and let people look at it and take what they will. __________________

04-02-07, 05:20 PM	#9
Sailor Steve Eternal Patrol Join Date: Nov 2002 Location: High in the mountains of Utah Posts: 50,369 Downloads: 745 Uploads: 249	Aw, man, I read the title and thought "Really? They don't have them in the game? COOL!" It isn't even April first anymore; it wasn't even a joke...but it got me anyway! :rotfl: __________________ “Never do anything you can't take back.” —Rocky Russo

04-02-07, 02:39 PM	#3
Jungman Samurai Navy Join Date: Apr 2005 Location: Iowa, USA Posts: 596 Downloads: 0 Uploads: 0	That works well, nice information. But in WWII they did not have a calculator to compute those fun conversions, arcsin, sin, even divide? I thought that is what they use the TDC for (as a calculator). Though I do admit, I also make the same manual calculation without the TDC...except I stick into the TDC just for fun. I think they would have had to use that nomograph, wizwheels and stuff (no TDC ). How did they do it without the power of a modern calculator, or a TDC? BTY what is a Sugar boat? the S-class?

04-02-07, 02:43 PM	#4
nattydread Captain Join Date: Jan 2004 Posts: 498 Downloads: 2 Uploads: 0	I assume they had spread-sheets for the trig computations. I have one. They also had a another guy or two doing the computations and map plotting other then the guy looking through the scope to make it efficient time wise considering they couldnt pause real life

04-02-07, 03:01 PM	#6
John Channing Sea Lord Join Date: Sep 1998 Posts: 1,846 Downloads: 163 Uploads: 5	I believe they had a circular slide rule called an "Is/Was" or "Banjo". JCC

04-02-07, 03:27 PM	#7
Jungman Samurai Navy Join Date: Apr 2005 Location: Iowa, USA Posts: 596 Downloads: 0 Uploads: 0	Thanks for the info. You know, it maybe cool to try to reproduce those tables and banjo thingy to do it the old fasion way, no modern calculator. One other question, in SH3 someone did have a way to determine speed by listing to the number of revolution of the screws via hydrophone. It was bit hard to use depending on what ship you were listening too. iRL you did not know this ship's ID. If the hydrophone does not work at PD, you can still get range via an active sonar ping to the target. I am surprised that a warship's passive sonar guy did not hear that. Is that realistic> pinging the target to get range via active sonar at PD? without spooking the warship. Modern ships/subs would hear that immediately. I guess in the old days, it was hard to hear that one or two pings unless they got real lucky.

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